Township of Haverford, PA
Delaware County
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Table of Contents
Table of Contents
[HISTORY: Adopted by the Board of Commissioners of the Township of Haverford as indicated in article histories. Amendments noted where applicable.]
GENERAL REFERENCES
Department of Code Enforcement — See Ch. 4, Part 4, Art. VI.
Planning Commission — See Ch. 4, Art. VI, Division 3.
Environmental performance standards — See Ch. 76.
Floodplains — See Ch. 89.
Property maintenance — See Ch. 138.
Streets and sidewalks — See Ch. 157.
Subdivision and land development — See Ch. 160.
Zoning — See Ch. 182.
[Adopted 2-12-1973 by Ord. No. 1505]
This chapter shall be known and may be cited as the "Township of Haverford Erosion and Sediment Control Ordinance."
The purpose of this chapter is to regulate the modification of the natural terrain, the alteration of drainage, the maintenance of artificial structures and surfaces and to provide for certain erosion and sediment control measures within the Township of Haverford so as to assure and safeguard health, safety, ecology and general welfare in the Township of Haverford.
A. 
Whenever the landscape or vegetation is to be disturbed, a plan showing how erosion and sediment shall be controlled is required.
B. 
As a minimum, a plan for the following will be required in all situations:
(1) 
The amount of site alteration proposed.
(2) 
Construction timing or sequence.
(3) 
Erosion and sediment control practices, both temporary and permanent.
(4) 
Operation and maintenance arrangements for the practices.
C. 
Whenever the landscape or vegetation is to be disturbed and the proposal involves an area less than 1/2 an acre, a no-fee permit shall be required.
A. 
It shall be unlawful for any person, firm or corporation to pave, fill, strip, grade or regrade any land within the Township of Haverford without first securing a permit as hereunder provided.
B. 
It shall be unlawful for any person, firm or corporation to disturb, modify, block, divert or affect the natural overland or subsurface flow of stormwater within the Township of Haverford without first securing a permit as hereunder provided.
C. 
It shall be unlawful for any person, firm or corporation to construct, erect or install any drainage dam, ditch, culvert, drainpipe, bridge or any other structure or obstruction affecting the drainage of any premises in the Township of Haverford without first securing a permit as hereunder provided.
A. 
Any person, firm or corporation proposing to engage in an activity requiring a permit hereunder shall apply for a permit by written application on a form furnished by the Township of Haverford.
B. 
Proof of application for permit shall be submitted to the Township of Haverford Planning Commission simultaneously with preliminary plans to be considered for subdivision/development review.[1]
[1]
Editor's Note: See Ch. 4, Administration of Government, Part 6, Administrative Boards and Commissions, Art. XXIII, Planning Commission.
C. 
The developer is encouraged to consult the general development plans and detailed plans of any unit of government that affect the tract to be developed and the area surrounding it before he submits a preliminary plan for review. He should also become acquainted with the Zoning Ordinance and other ordinances which regulate the development of land in the Township of Haverford.[2]
[2]
Editor's Note: See Ch. 182, Zoning and Ch. 160, Subdivision and Land Development, respectively.
D. 
A separate application shall be required for each grading permit. Three copies of the proposed plan, including specifications and timing schedules, shall be submitted with each application for a permit. One of the copies, at the discretion of the Director of Code Enforcement, shall be submitted to the Delaware County Conservation District for comment and review.
[Amended 6-30-1986 by Ord. No. 1960]
E. 
Applications for review required under this chapter shall be accompanied by a review fee as fixed by resolution of the Board of Commissioners, which may be amended from time to time.
[Amended 2-8-1993 by Ord. No. 2168]
F. 
All applications for a permit involving an area greater than one acre shall be accompanied by a bond or escrow deposit, to the benefit of the Township of Haverford in an amount as provided by Township resolution. The form of the bond or escrow account shall first be approved by the Township Solicitor, which shall guarantee the full and complete compliance with this chapter.
[Amended 2-8-1993 by Ord. No. 2168]
The application for a permit shall be accompanied by a plan of the property showing:
A. 
A boundary line survey of the site on which the work is to be performed.
B. 
A description of the features, existing and proposed, surrounding the site which are of importance to the proposed development.
C. 
A description of the general topographic and soil conditions, including drainage, on the site available through the Delaware County Conservation District.
D. 
The location and description of existing and future manmade features of importance to the proposed development, i.e., cuts and fills, buildings, roads, etc.
E. 
Plans and specifications of soil erosion and sediment control measures in accordance with standards and specifications of the Delaware County Conservation District or the Township of Haverford.
F. 
A time schedule indicating the anticipated starting and completion dates of the development sequence and the time of exposure of each area prior to the completion of effective erosion and sediment control measures.
[Amended 2-15-2005 by Ord. No. 2439]
A. 
Stormwater management plans shall be as required in this chapter.
(1) 
The application for a permit shall be accompanied by a plan of the property showing the location of all present and proposed ditches, streams, pipes and other drainage structures and proposed cuts and fills. In addition to showing present elevations and dimensions and location and extent of all proposed grading and/or drainage, the plan shall clearly indicate all buildings, parking areas and driveways. Further, the plan shall indicate the present and proposed sources, storage and disposition of water being channeled through or across the premises, together with elevations, gradients and maximum flow rates. The application shall describe the work to be performed, the materials to be used and the manner or method of performance, including provisions for protecting and maintaining existing drainage facilities whether on public or private property. The applicant shall supply data supporting the plan developed by a registered professional civil engineer or an engineer qualified in hydrology.
(2) 
Stormwater management plans shall be prepared in accordance with this chapter.
B. 
The following provisions apply to the carrying and disposal of stormwater runoff:
(1) 
The applicant shall agree to the granting and recording of easements for drainage facilities, including acceptance of the discharge of water on the property of others, provisions for maintenance of slopes and swales and access for the maintenance of anti-erosion facilities.
C. 
If load-bearing fill is proposed, a soils investigation report shall be submitted, which shall consist of test borings, laboratory testings and engineering analysis to correlate surface and subsurface conditions with the proposed grading plan. The results of the investigation shall be presented in a report by a registered professional soils engineer or geologist, which shall include data regarding the nature, distribution and supporting ability of existing soils and rocks on the site, conclusions and recommendations to ensure stable soil conditions and groundwater control, as applicable. The Township of Haverford may require such supplemental reports and data as it deems necessary. Recommendations included in such reports and approved by the Township of Haverford shall be incorporated in the plan or specifications.
(1) 
Fills toeing out on natural slopes steeper than four horizontal to one vertical shall not be made unless approved by the Township of Haverford after receipt of a report, deemed acceptable by the Township of Haverford Engineer, by a registered professional soils engineer certifying that he has investigated the property, made soil tests and that, in his opinion, such steeper slopes will safely support the proposed fill.
(2) 
Natural and/or existing slopes exceeding five horizontal to one vertical shall be benched or continuously stepped into competent materials prior to placing all classes of fill.
[Amended 6-30-1986 by Ord. No. 1960]
Upon the submission of an application which conforms to the provisions of this chapter, the Director of Code Enforcement, after consultation with the Township of Haverford Engineer, shall issue the necessary permit.
A. 
Notwithstanding any provision of this chapter or any condition of the permit, the permittee is responsible for the prevention of damage to other property or personal injury which may be affected by the activity requiring a permit.
B. 
No person, firm or corporation shall modify, fill, excavate, pave, grade or regrade land in any manner so close to a property line as to endanger or damage any adjoining street, sidewalk, alley or any other public or private property without supporting and protecting such property from settling, cracking, erosion, sediment or other physical damage or personal injury which might result.
C. 
No person, firm or corporation shall deposit or place any debris or any other material whatsoever or to cause such to be thrown or placed in any drainage ditch or drainage structure in such a manner as to obstruct free flow.
D. 
No person, firm or corporation shall fail to adequately maintain in good operating order any drainage facility on his premises. All drainage ditches, culverts, drainpipes and drainage structures shall be kept open and free-flowing at all times.
E. 
The owner of any property on which any work has been done pursuant to a permit granted under this chapter shall continuously maintain and repair all graded surfaces and antierosion devices, retaining walls, drainage structures or means and other protective devices, plantings and ground cover installed or completed.
F. 
All graded surfaces shall be seeded, sodded and/or planted or otherwise protected from erosion within 60 days and shall be watered, tended and/or maintained until growth, in the case of vegetation, is well established. The disturbed area and duration of exposure shall be kept to a practical minimum.
G. 
All trees in the area of extreme grade change shall be removed unless protected with suitable tree wells. However, extreme precautions shall be taken to prevent the unnecessary removal of trees.
H. 
When required, adequate provisions shall be made for dust control measures as are deemed acceptable by the Township of Haverford.
I. 
All plans and specifications accompanying applications for permits shall include provisions for both interim (temporary) and ultimate (permanent) erosion and sediment control.
(1) 
The design, installation and maintenance of erosion and sediment control measures shall be accomplished in accordance with standards and specifications established by the Delaware County Conservation District as adapted from standards and specifications of the Soil Conservation Service, United States Department of Agriculture.
(2) 
Technical standards for the design and installation of erosion and sediment control measures are on file with the Township of Haverford office, the office of the Delaware,County Conservation District and other governmental agency offices.
(3) 
Standards and specifications adopted for the purposes of this chapter and by the Delaware County Conservation District include but are not limited to the following basic conservation measures:
(a) 
Temporary cover on critical areas.
(b) 
Permanent grass and legume cover on critical areas on prepared seedbed.
(c) 
Permanent grass and legume cover on critical areas on unprepared seedbed.
(d) 
Sodding.
(e) 
Mulching.
(f) 
Temporary diversion.
(g) 
Permanent diversion.
(h) 
Grassed waterway or outlet.
(i) 
Grade stabilization structure.
(j) 
Debris basin.
(k) 
Drain.
(l) 
Drainage, main or lateral.
J. 
A quality control program is critical for fills, therefore, whenever fill material is to be used, each layer of compacted fill should be tested to determine its dry density as per ASTM D 1556. The density of each layer should not be less than 95% of maximum dry density as determined by ASTM D 1557.
(1) 
Inspection procedure shall follow the general procedure as stated in § 78-10.
(2) 
Compaction test reports shall be kept on file at the site and shall be subject to review at all times.
(3) 
The degree of compaction required shall be determined by the Township of Haverford Engineer following the guidelines in Subsection J above.
(4) 
Where the provisions of Subsection J are determined to be inapplicable, they may be waived by the Township of Haverford Engineer.
A. 
All inspections shall be the responsibility of the Director of Code Enforcement or his qualified designee.
[Amended 6-30-1986 by Ord. No. 1960]
B. 
Inspections will be carried out on a random basis, except as stated in Subsection E of this section. However, a set of as-built plans shall be on file at the site and authenticated by a registered professional engineer. When it is deemed acceptable to the Director of Code Enforcement, a designated qualified person may authenticate the as-built plans and will assume full responsibility for quality of work.
[Amended 6-30-1986 by Ord. No. 1960]
C. 
Any and all as-built plans shall be available on the site at all times and be subject to inspection and inquiry.
D. 
Engineering check notes shall accompany all as-built plans which involve structural or mechanical measures and shall serve as supporting evidence that structures meet design standards and specifications.
E. 
A final inspection shall be conducted by the Director of Code Enforcement to certify compliance with this chapter. Satisfactory compliance with this chapter shall be necessary before issuance of an occupancy permit.
[Amended 6-30-1986 by Ord. No. 1960]
[Amended 6-30-1986 by Ord. No. 1960]
All applicants shall bear all cost of inspections required hereunder and shall deposit with the Director of Finance such sum as the Director of Code Enforcement shall determine to be necessary to guarantee payment of the cost of such inspections.
[Amended 6-13-1988 by Ord. No. 2019; 3-12-2012 by Ord. No. 2660]
Any person, firm or corporation violating any provision of this chapter shall, upon summary conviction before any District Justice of the Peace, pay a fine not exceeding $1,000 and costs of prosecution; and in default of one payment of the fine and costs, the violator may be sentenced to the county jail for a term of not more than 90 days. Each and every day in which any person, firm or corporation shall be in violation of this chapter shall constitute a separate offense.
[Adopted 2-15-2005 by Ord. No. 2439]
This article shall be known as the Township of Haverford Stormwater Management Code.
The Board of Commissioners of Haverford Township finds that:
A. 
Inadequate management of accelerated stormwater runoff resulting from development throughout a watershed increases flood flows and velocities, contributes to erosion and sedimentation, overtaxes the carrying capacity of existing streams and storm sewers, greatly increases the cost of public facilities to convey and manage stormwater, undermines floodplain management and flood reduction efforts in upstream and downstream communities, reduces groundwater recharge, and threatens public health and safety.
B. 
Inadequate planning and management of stormwater runoff resulting from land development throughout a watershed can also harm surface water resources by changing the natural hydrologic patterns, accelerating stream flows (which increase scour and erosion of streambeds and streambanks, thereby elevating sedimentation), destroying aquatic habitat, and elevating aquatic pollutant concentrations and loadings such as sediments, nutrients, heavy metals, and pathogens. Groundwater resources are also impacted through loss of recharge.
C. 
A comprehensive program of stormwater management, including minimization of impacts of development, redevelopment, and activities causing accelerated erosion and loss of natural infiltration, is fundamental to the public health, safety, welfare, and the protection of the people of Haverford Township and all of the people of the commonwealth, their resources, and the environment.
D. 
Stormwater can be an important water resource by providing groundwater recharge for water supplies and baseflow of streams, which also protects and maintains surface water quality.
E. 
Impacts from stormwater runoff can be minimized by using project designs that maintain the natural hydrologic regime and sustain high water quality, groundwater recharge, stream baseflow, and aquatic ecosystems. The most cost-effective and environmentally advantageous way to manage stormwater runoff is through nonstructural project design that minimizes impervious surfaces and sprawl, avoids sensitive areas (i.e., stream buffers, floodplains, steep slopes), and considers topography and soils to maintain the natural hydrologic regime.
F. 
Public education on the control of pollution from stormwater is an essential component in successfully addressing stormwater.
G. 
Federal and state regulations require certain municipalities to implement a program of stormwater controls. These municipalities are required to obtain a permit for stormwater discharges from their separate storm sewer systems under the National Pollutant Discharge Elimination System (NPDES).
H. 
Nonstormwater discharges to municipal separate storm sewer systems can contribute to pollution of waters of the commonwealth by Haverford Township.
The purpose of this article is to promote the public health, safety, and welfare within the Township of Haverford by maintaining the natural hydrologic regime and minimizing the impacts described in § 78-14 of this article through provisions designed to:
A. 
Promote alternative project designs and layouts that minimize the impacts on surface and groundwater.
B. 
Promote nonstructural best management practices (BMPs).
C. 
Minimize increases in runoff stormwater volume.
D. 
Minimize impervious surfaces.
E. 
Manage accelerated stormwater runoff and erosion and sedimentation problems and stormwater runoff impacts at their source by regulating activities that cause these problems.
F. 
Provide review procedures and performance standards for stormwater planning and management.
G. 
Utilize and preserve existing natural drainage systems as much as possible.
H. 
Manage stormwater impacts close to the runoff source, requiring a minimum of structures and relying on natural processes.
I. 
Focus on infiltration of stormwater to maintain groundwater recharge, to prevent degradation of surface and groundwater quality, and to otherwise protect water resources.
J. 
Maintain existing baseflows and quality of streams and watercourses, where possible.
K. 
Meet legal water quality requirements under state law, including regulations at 25 Pennsylvania Code Chapter 93.4a requiring protection and maintenance of "existing uses" and maintenance of the level of water quality to support those uses in all streams, and the protection and maintenance of water quality in "special protection" streams.
L. 
Address the quality and quantity of stormwater discharges from the development site.
M. 
Provide a mechanism to identify stormwater controls necessary to meet NPDES permit requirements.
N. 
Implement an illegal discharge detection and elimination program that addresses nonstormwater discharges into Haverford Township's separate storm sewer system.
O. 
Preserve the flood-carrying capacity of streams.
P. 
Prevent scour and erosion of streambanks and streambeds.
Q. 
Provide performance standards and design criteria for watershed-wide stormwater management and planning.
R. 
Provide proper operation and maintenance of all permanent stormwater management facilities and BMPs that are implemented in the Township.
The Township is empowered to regulate land use activities that affect runoff and surface and groundwater quality and quantity by the authority of:
A. 
Act of October 4, 1978, 32 P.S., P.L. 864 (Act 167) § 680.1 et seq., as amended, the "Stormwater Management Act" (hereinafter referred to as "the Act");
B. 
Water Resources Management Act of 2002, as amended;
C. 
Second Class Township Code, 53 P.S. §§ 66501 et seq., 66601 et seq., and the Borough Code, 53 P.S. § 46201 et seq.;
D. 
Pennsylvania Municipalities Planning Code, Act 247, as amended.
A. 
This article shall apply to all areas of Haverford Township.
B. 
This article shall only apply to permanent structural and nonstructural stormwater management BMPs constructed as part of any of the regulated activities listed in this section.
C. 
This article contains only the stormwater management performance standards and design criteria that are necessary or desirable from a watershed-wide perspective. Local stormwater management design criteria (e.g., inlet spacing, inlet type, collection system design and details, outlet structure design, etc.) shall continue to be regulated by the applicable municipal ordinances and applicable state regulations.
D. 
The following activities are defined as "regulated activities" and shall be regulated by this article unless exempted by § 78-18:
(1) 
Land development.
(2) 
Subdivisions.
(3) 
Alteration of the natural hydrologic regime.
(4) 
Construction or reconstruction of or addition of new impervious or semipervious surfaces (i.e., driveways, parking lots, roads, etc.).
(5) 
Construction of new buildings or additions to existing buildings.
(6) 
Redevelopment.
(7) 
Diversion piping or encroachments in any natural or man-made channel.
(8) 
Nonstructural and structural stormwater management BMPs or appurtenances thereto.
(9) 
Earth disturbance activities of greater than 5,000 square feet.[1]
[1]
Editor's Note: This article applies to any earth disturbance activity greater than or equal to 5,000 square feet that is associated with a development or redevelopment project. Earth disturbance activities of less than one acre that are associated with redevelopment projects are exempt from the § 78-36 streambank erosion requirements. Earth disturbance activities and associated stormwater management controls are also regulated under existing state law and implementing regulations. This article shall operate in coordination with those parallel requirements; the requirements of this article shall be no less restrictive in meeting the purposes of this article than state law.
(10) 
Any of the above regulated activities which were approved more than five years prior to the effective date of this article and resubmitted for municipal approval.
Table 105.1[2] summarizes the applicability requirements of the ordinance. "Proposed impervious surface" in Table 105.1 includes new, additional, or replacement impervious surface/cover. Repaving existing surfaces without reconstruction does not constitute "replacement."
[2]
Editor's Note: Table 105.1, Applicability, is included at the end of this chapter.
A. 
Exemptions for land use activities. The following land use activities are exempt from the drainage plan submission requirements of this article.
(1) 
Use of land for gardening for home consumption.
(2) 
Agriculture when operated in accordance with a conservation plan, nutrient management plan, or erosion and sedimentation control plan approved by the County Conservation District, including activities such as growing crops, rotating crops, tilling of soil, and grazing animals. Installation of new or expansion of existing farmsteads, animal housing, waste storage, and production areas having impervious surfaces that result in a net increase in earth disturbance of greater than 5,000 square feet shall be subject to the provisions of this article.
(3) 
Forest management operations which are following the Department of Environmental Protection's (DEP) management practices contained in its publication "Soil Erosion and Sedimentation Control Guidelines for Forestry" and are operating under an approved erosion and sedimentation plan and must comply with the stream buffer requirements in § 78-35G.
(4) 
Road replacement, development, or redevelopment that has less than 1,000 square feet of new, additional, or replaced impervious surface/cover, or in the case of earth disturbance only, less than 5,000 square feet of disturbance, is exempt from this article.
B. 
Exemptions for land development activities.
(1) 
The following land development and earthmoving activities are exempt from the drainage plan submission requirements of this article.
(a) 
A maximum of 1,000 square feet of new, additional, or replacement proposed impervious surface.
(b) 
Up to a maximum of 5,000 square feet of disturbed earth.
(2) 
These criteria shall apply to the total development even if the development is to take place in phases. The date of the municipal ordinance adoption shall be the starting point from which to consider tracts as "parent tracts" upon which future subdivisions and respective earth disturbance computations shall be cumulatively considered.
The activities exempted above are still encouraged to implement the stormwater management practices as indicated in Appendix B.[1]
[1]
Editor's Note: Appendix B is included at the end of this chapter.
(3) 
The developer should first determine if the proposed activity will result in the introduction of 1,000 square feet or more of new, additional, or replacement impervious surface. If not, the developer should next determine if the proposed activity will involve earthmoving of over 5,000 square feet. If not, then the project is exempt from the drainage plan requirements. Examples:
(a) 
A project introducing 1,100 square feet of impervious cover, but only 4,900 square feet of earthmoving is regulated by this article.
(b) 
A project involving 5,100 square feet of earthmoving, but resulting in 900 square feet of impervious cover is regulated.
(c) 
A project introducing 900 square feet of impervious cover and involving 4,900 square feet of earthmoving is exempt from the drainage plan requirements of this article.
C. 
Additional exemption criteria:
(1) 
Exemption responsibilities. An exemption shall not relieve the applicant from implementing such measures as are necessary to protect public health, safety, and property.
(2) 
HQ and EV streams. An exemption shall not relieve the applicant from meeting the special requirements for watersheds draining to identified high quality (HQ) or exceptional value (EV) waters and source water protection areas (SWPA) and requirements for nonstructural project design sequencing (§ 78-33).
(3) 
Drainage problems. If a drainage problem is documented or known to exist downstream of or is expected from the proposed activity, then Haverford Township may require the applicant to comply with this article.
(4) 
Emergency exemption. Emergency maintenance work performed for the protection of public health, safety, and welfare. A written description of the scope and extent of any emergency work performed shall be submitted to the Township of Haverford within two calendar days of the commencement of the activity. If the Township of Haverford finds that the work is not an emergency, then the work shall cease immediately, and the requirements of this article shall be addressed as applicable.
(5) 
Maintenance exemption. Any maintenance to an existing stormwater management system made in accordance with plans and specifications approved by the municipal Engineer or the Township of Haverford.
(6) 
Even though the developer is exempt, he/she is not relieved from complying with other regulations.
Any ordinance or ordinance provision of Haverford Township inconsistent with any of the provisions of this article is hereby repealed to the extent of the inconsistency only.
Should any section or provision of this article be declared invalid by a court of competent jurisdiction, such decision shall not affect the validity of any of the remaining provisions of this article.
A. 
Approvals issued pursuant to this article do not relieve the applicant of the responsibility to secure required permits or approvals for activities regulated by any other applicable code, rule, act, or ordinance.
B. 
To the extent that this article imposes more rigorous or stringent requirements for stormwater management, the specific requirements contained in this article shall be followed.
C. 
Nothing in this article shall be construed to affect any of Haverford Township's requirements regarding stormwater matters that do not conflict with the provisions of this article, such as local stormwater management design criteria (e.g., inlet spacing, inlet type, collection system design and details, outlet structure design, etc.). Conflicting provisions in other municipal ordinances or regulations shall be construed to retain the requirements of this article addressing state water quality requirements.
For the purposes of this article, certain terms and words used herein shall be interpreted as follows:
A. 
Words used in the present tense include the future tense; the singular number includes the plural, and the plural number includes the singular; words of masculine gender include feminine gender; and words of feminine gender include masculine gender.
B. 
The word "includes" or "including" shall not limit the term to the specific example, but is intended to extend its meaning to all other instances of like kind and character.
C. 
The word "person" includes an individual, firm, association, organization, partnership, trust, company, corporation, unit of government, or any other similar entity.
D. 
The words "shall" and "must" are mandatory; the words "may" and "should" are permissive.
E. 
The words "used" or "occupied" include the words "intended, designed, maintained, or arranged to be used, occupied, or maintained."
As used in this article, the following terms shall have the meanings indicated:
ACCELERATED EROSION
The removal of the surface of the land through the combined action of man's activity and the natural processes at a rate greater than would occur because of the natural process alone.
AGRICULTURAL ACTIVITIES
The work of producing crops and raising livestock, including tillage, plowing, disking, harrowing, pasturing, mushroom growing, nursery, and sod operations and installation of conservation measures. Construction of new buildings or impervious area is not considered an agricultural activity.
ALTERATION
As applied to land, a change in topography as a result of the moving of soil and rock from one location or position to another; also the changing of surface conditions by causing the surface to be more or less impervious; land disturbance.
APPLICANT
A person who has filed an application for approval to engage in any regulated activity defined in § 78-17 of this article.
AS-BUILT DRAWINGS
Engineering or site drawings maintained by the contractor as he constructs the project and upon which he documents the actual locations of the building components and changes to the original contract documents. These documents, or a copy of same, are turned over to the municipal Engineer at the completion of the project.
BANKFULL
The channel at the top-of-bank or point from where water begins to overflow onto a floodplain.
BASEFLOW
Portion of stream discharge derived from groundwater; the sustained discharge that does not result from direct runoff or from water diversions, reservoir releases, piped discharges, or other human activities.
BIORETENTION
A stormwater retention area that utilizes woody and herbaceous plants and soils to remove pollutants before infiltration occurs.
BMP (BEST MANAGEMENT PRACTICE)
Methods, measures, or practices used to prevent or reduce surface runoff and/or water pollution, including but not limited to structural and nonstructural stormwater management practices and operation and maintenance procedures. See also "nonstructural best management practices (BMPs)."
BUFFER
The area of land immediately adjacent to any stream, measured perpendicular to and horizontally from the top-of-bank on both sides of a stream (see "top-of-bank").
CHANNEL
An open drainage feature through which stormwater flows. Channels include, but shall not be limited to, natural and man-made drainageways, swales, streams, ditches, canals, and pipes flowing partly full.
CHANNEL EROSION
The widening, deepening, or headward cutting of channels and waterways caused by stormwater runoff or bankfull flows.
CISTERN
An underground reservoir or tank for storing rainwater.
CONSERVATION DISTRICT
The Delaware County Conservation District.
CONVEYANCE
A facility or structure used for the transportation or transmission of something from one place to another.
CULVERT
A structure with its appurtenant works which carries water under or through an embankment or fill.
DAM
A man-made barrier, together with its appurtenant works, constructed for the purpose of impounding or storing water or another fluid or semifluid. A dam may include a refuse bank, fill, or structure for highway, railroad, or other purposes which impounds or may impound water or another fluid or semifluid.
DEPARTMENT
The Pennsylvania Department of Environmental Protection.
DESIGNEE
The agent of the Delaware County Planning Commission, Delaware County Conservation District, and/or agent of the governing body involved with the administration, review, or enforcement of any provisions of this article by contract or memorandum of understanding.
DESIGN PROFESSIONAL (QUALIFIED)
A Pennsylvania-registered professional engineer, registered landscape architect, or registered professional land surveyor trained to develop stormwater management plans.
DESIGN STORM
The magnitude and temporal distribution of precipitation from a storm event measured in probability of occurrence (e.g., a five-year storm) and duration (e.g., 24 hours), used in the design and evaluation of stormwater management systems.
DETENTION BASIN
An impoundment designed to collect and retard stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate. Detention basins are designed to drain completely soon after a rainfall event and become dry until the next rainfall event.
DEVELOPER
A person who seeks to undertake any regulated earth disturbance activities at a project site in Haverford Township.
DEVELOPMENT
Any human-induced change to improved or unimproved real estate, whether public or private, including but not limited to land development, construction, installation, or expansion of a building or other structure, land division, street construction, drilling, and site alteration, such as embankments, dredging, grubbing, grading, paving, parking or storage facilities, excavation, filling, stockpiling, or clearing. As used in this article, development encompasses both new development and redevelopment.
DEVELOPMENT SITE
The specific tract or parcel of land where any regulated activity set forth in § 78-15 is planned, conducted, or maintained.
DIAMETER AT BREAST HEIGHT (DBH)
The outside bark diameter at breast height which is defined as 4.5 feet (1.37m) above the forest floor on the uphill side of the tree.
DIFFUSED DRAINAGE DISCHARGE
Drainage discharge that is not confined to a single point location or channel, including sheet flow or shallow concentrated flow.
A. 
(verb) To release water from a project, site, aquifer, drainage basin, or other point of interest;
B. 
(noun) The rate and volume of flow of water such as in a stream, generally expressed in cubic feet per second (see "peak discharge").
DISCHARGE POINT
The point of discharge for a stormwater facility.
DISTURBED AREAS
Unstabilized land area where an earth disturbance activity is occurring or has occurred.
DITCH
A man-made waterway constructed for irrigation or stormwater conveyance purposes.
DOWNSLOPE PROPERTY LINE
That portion of the property line of the lot, tract, or parcels of land being developed, located such that overland or pipe flow from the project site would be directed towards it by gravity.
DRAINAGE CONVEYANCE FACILITY
A stormwater management facility designed to transport stormwater runoff that includes channels, swales, pipes, conduits, culverts, and storm sewers.
DRAINAGE EASEMENT
A right granted by a landowner to a grantee allowing the use of private land for stormwater management purposes.
DRAINAGE PERMIT
A permit issued by Haverford Township after the drainage plan has been approved.
DRAINAGE PLAN
The documentation of the stormwater management system, if any, to be used for a given development site, the contents of which are established in § 78-25.
EARTH DISTURBANCE ACTIVITY
A construction or other human activity which disturbs the surface of land, including but not limited to clearing and grubbing, grading, excavations, embankments, land development, agricultural plowing or tilling, timber harvesting activities, road maintenance activities, mineral extraction, and the moving, depositing, stockpiling, or storing of soil, rock, or earth materials.
EMERGENCY SPILLWAY
A conveyance area that is used to pass peak discharge greater than the maximum design storm controlled by the stormwater facility.
ENCROACHMENT
A structure or activity that changes, expands or diminishes the course, current, or cross-section of a watercourse, floodway or body of water.
EROSION
The process by which the surface of the land, including water/stream channels, is worn away by water, wind or chemical action.
EROSION AND SEDIMENT CONTROL PLAN
A plan that is designed to minimize accelerated erosion and sedimentation. Said plan must be submitted to and approved by the appropriate conservation district before construction can begin.
EXCEPTIONAL VALUE WATERS
Surface waters of high quality which satisfy Pennsylvania Code Title 25 Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(b) (relating to anti-degradation).
EXISTING CONDITIONS
The initial condition of a project site prior to the proposed alteration. If the initial condition of the site is undeveloped land, the land use shall be considered as "meadow" unless the natural land cover is proven to generate a lower curve number or Rational "c" value, such as forested lands.
FLOOD
A temporary condition of partial or complete inundation of land areas from the overflow of streams, rivers, and other waters of this commonwealth.
FLOODPLAIN
Any land area susceptible to inundation by water from any natural source or as delineated by the applicable Department of Housing and Urban Development, Federal Insurance Administration Flood Hazard Boundary Map as being a special flood hazard area.
FLOODWAY
The channel of a watercourse and those portions of the adjoining floodplains which are reasonably required to carry and discharge the one-hundred-year frequency flood. Unless otherwise specified, the boundary of the floodway is as indicated on maps and flood insurance studies provided by the Federal Emergency Management Agency (FEMA). In an area where no FEMA maps or studies have defined the boundary of the one-hundred-year frequency floodway, it is assumed, absent evidence to the contrary, that the floodway extends from the stream to 50 feet from the top-of-bank.
FLUVIAL GEOMORPHOLOGY
The study of landforms associated with river channels and the processes that form them.
FOREST MANAGEMENT/TIMBER OPERATIONS
Planning and associated activities necessary for the management of forest lands. These include timber inventory and preparation of forest management plans, silvicultural treatment, cutting budgets, logging road design and construction, timber harvesting, and reforestation.
FREEBOARD
A vertical distance between the elevation of the design high water and the top of a dam, levee, tank, basin, swale, or diversion berm. The space is required as a safety margin in a pond or basin.
A. 
(noun) A slope, usually of a road, channel or natural ground specified in percent and shown on plans as specified herein.
B. 
(verb) To finish the surface of a roadbed, the top of an embankment, or the bottom of an excavation.
GRASSED WATERWAY
A natural or man-made waterway, usually broad and shallow, covered with erosion-resistant grasses, used to convey surface water.
GROUNDWATER
Water beneath the earth's surface that supplies wells and springs and is often between saturated soil and rock.
GROUNDWATER RECHARGE
The replenishment of existing natural underground water supplies from rain or overland flow.
HEC-HMS
The U.S. Army Corps Of Engineers, Hydrologic Engineering Center (HEC) – Hydrologic Modeling System (HMS). This model was used to model the Darby-Cobbs and Crum Creek watersheds during the Act 167 plan development and was the basis for the standards and criteria of this article.
HIGH QUALITY WATERS
Surface waters having quality which exceeds levels necessary to support propagation of fish, shellfish, and wildlife and recreation in and on the water by satisfying Pennsylvania Code Title 25 Environmental Protection, Chapter 93, Water Quality Standards, § 93.4b(a).
HOTSPOTS
Areas where land use or activities generate highly contaminated runoff, with concentrations of pollutants in excess of those typically found in stormwater.
HYDROGRAPH
A graph representing the discharge of water versus time for a selected point in the drainage system.
HYDROLOGIC REGIME
The hydrologic cycle or balance that sustains quality and quantity of stormwater, baseflow, storage and groundwater supplies under natural conditions.
HYDROLOGIC SOIL GROUP
A classification of soils by the Natural Resources Conservation Service (NRCS), formerly the Soil Conservation Service (SCS), into four runoff potential groups. The groups range from A soils, which are very permeable and produce little runoff, to D soils, which are not very permeable and produce much more runoff.
IMPERVIOUS SURFACE
A surface that prevents the infiltration of water into the ground. Impervious surfaces include, but are not limited to, streets, sidewalks, pavements, driveway areas, or roofs. Any surface areas designed to be gravel or crushed stone shall be regarded as impervious surfaces.
IMPOUNDMENT
A retention or detention basin designed to retain stormwater runoff and release it at a controlled rate.
INFILL
Development that occurs on smaller parcels that remain undeveloped but are within or in very close proximity to urban or densely developed areas. Infill development usually relies on existing infrastructure and does not require an extension of water, sewer, or other public utilities.
INFILTRATION
Movement of surface water into the soil, where it is absorbed by plant roots, evaporated into the atmosphere, or percolated downward to recharge groundwater.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the underground water (e.g., French drains, seepage pits, or seepage trenches).
INFLOW
The flow entering the stormwater management facility and/or BMP.
INLET
The upstream end of any structure through which water may flow.
INTERMITTENT STREAM
A stream that flows only part of the time. Flow generally occurs for several weeks or months in response to seasonal precipitation or groundwater discharge.
INVERT
The lowest surface, the floor or bottom of a culvert, drain, sewer, channel, basin, BMP, or orifice.
LAND DEVELOPMENT
Any of the following activities:
A. 
The improvement of one lot or two or more contiguous lots, tracts, or parcels of land for any purpose involving:
(1) 
A group of two or more residential or nonresidential buildings, whether proposed initially or cumulatively, or a single nonresidential building on a lot or lots regardless of the number of occupants or tenure; or
(2) 
The division or allocation of land or space, whether initially or cumulatively, between or among two or more existing or prospective occupants by means of, or for the purpose of, streets, common areas, leaseholds, condominiums, building groups, or other features.
B. 
A subdivision of land.
C. 
Development in accordance with § 503(1.1) of the PA Municipalities Planning Code.
LIMITING ZONE
A soil horizon or condition in the soil profile or underlying strata that includes one of the following:
A. 
A seasonal high water table, whether perched or regional, determined by direct observation of the water table or indicated by soil mottling.
B. 
A rock with open joints, fracture or solution channels, or masses of loose rock fragments, including gravel, with insufficient fine soil to fill the voids between the fragments.
C. 
A rock formation, other stratum, or soil condition that is so slowly permeable that it effectively limits downward passage of water.
LOT
A designated parcel, tract, or area of land established by a plat or otherwise as permitted by law and to be used, developed, or built upon as a unit.
MAIN STEM (MAIN CHANNEL)
Any stream segment or other runoff conveyance used as a reach in watershed-specific hydrologic models.
MANNING EQUATION (MANNING FORMULA)
A method for calculation of velocity of flow (e.g., feet per second) and flow rate (e.g., cubic feet per second) in open channels based upon channel shape, roughness, depth of flow, and slope. "Open channels" may include closed conduits so long as the flow is not under pressure.
MAXIMUM DESIGN STORM
The maximum (largest) design storm that is controlled by the stormwater facility.
MUNICIPAL ENGINEER
A professional engineer licensed as such in the Commonwealth of Pennsylvania, duly appointed as the Engineer for a municipality, planning agency, or joint planning commission.
MUNICIPALITY
Haverford Township, Delaware County, Pennsylvania.
NATURAL CONDITION
Predevelopment condition.
NATURAL HYDROLOGIC REGIME
See "hydrologic regime."
NATURAL RECHARGE AREA
Undisturbed surface area or depression where stormwater collects and a portion of which infiltrates and replenishes the underground and groundwater.
NONPOINT SOURCE POLLUTION
Pollution that enters a water body from diffuse origins in the watershed and does not result from discernible, confined, or discrete conveyances.
NONSTORMWATER DISCHARGES
Water flowing in stormwater collection facilities, such as pipes or swales, which is not the result of a rainfall event or snowmelt.
NONSTRUCTURAL BEST MANAGEMENT PRACTICES (BMPs)
Methods of controlling stormwater runoff quantity and quality, such as innovative site planning, impervious area and grading reduction, protection of natural depression areas, temporary ponding on site, and other techniques.
NPDES
National Pollutant Discharge Elimination System, the federal government's system for issuance of permits under the Clean Water Act, which is delegated to DEP in Pennsylvania.
NRCS
Natural Resource Conservation Service (previously SCS).
OPEN CHANNEL
A conveyance channel that is not enclosed.
OUTFALL
"Point source," as described in 40 CFR § 122.2, at the point where Haverford Township's storm sewer system discharges to surface waters of the commonwealth.
OUTFLOW
The flow exiting the stormwater management facility and/or BMP.
OUTLET
Points of water disposal to a stream, river, lake, tidewater, or artificial drain.
PARENT TRACT
The parcel of land from which a land development or subdivision originates, determined from the date of municipal adoption of this article.
PARKING LOT STORAGE
Involves the use of parking areas as temporary impoundments with controlled release rates during rainstorms.
PEAK DISCHARGE
The maximum rate of stormwater runoff from a specific storm event.
PENN STATE RUNOFF MODEL
The computer-based hydrologic model developed at Pennsylvania State University.
PIPE
A culvert, closed conduit, or similar structure (including appurtenances) that conveys stormwater.
PLANNING COMMISSION
The Planning Commission of Haverford Township.
POINT SOURCE
Any discernible, confined, and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel or conduit from which stormwater is or may be discharged, as defined in state regulations at 25 Pennsylvania Code § 92.1.
POSTCONSTRUCTION
Period after construction during which disturbed areas are stabilized, stormwater controls are in place and functioning, and all proposed improvements in the approved land development plan are completed.
PRECONSTRUCTION
Prior to commencing construction activities.
PREDEVELOPMENT CONDITION
Undeveloped/natural condition.
PRETREATMENT
Techniques employed in stormwater BMPs to provide storage or filtering to trap coarse materials and other pollutants before they enter the system, but not necessarily designed to meet the water quality volume requirements of § 78-35.
PROJECT SITE
The specific area of land where any regulated activities in Haverford Township are planned, conducted or maintained.
RATIONAL FORMULA
A rainfall-runoff relation used to estimate peak flow.
REACH
Any stream segment or other runoff conveyance used in the watershed-specific hydrologic models.
RECHARGE
The replenishment of groundwater through the infiltration of rainfall, other surface waters, or land application of water or treated wastewater.
RECONSTRUCTION
Demolition and subsequent rebuilding of impervious surface.
RECORD DRAWINGS
Original documents revised to suit the as-built conditions and subsequently provided by the engineer to the client. The engineer reviews the contractor's as-builts against his/her own records for completeness, then either turns these over to the client or transfers the information to a set of reproducibles, in both cases for the client's permanent records.
REDEVELOPMENT
Any development that requires demolition or removal of existing structures or impervious surfaces at a site and replacement with new impervious surfaces. Maintenance activities such as top-layer grinding and repaving are not considered to be redevelopment. Interior remodeling projects and tenant improvements are also not considered to be redevelopment.
REGULATED ACTIVITIES
Actions or proposed actions that have an impact on stormwater runoff quality or quantity and that are specified in § 78-17 of this article.
REGULATED EARTH DISTURBANCE ACTIVITY
Defined under NPDES Phase II regulations as earth disturbance activity of one acre or more with a point source discharge to surface waters or Haverford Township's storm sewer system or five acres or more regardless of the planned runoff. This includes earth disturbance on any portion of, part, or during any stage of a larger common plan of development.
RELEASE RATE
The percentage of existing conditions' peak rate of runoff from a site or subarea to which the proposed conditions' peak rate of runoff must be reduced to protect downstream areas.
REPAVING
Replacement of the impervious surface that does not involve reconstruction of an existing paved (impervious) surface.
REPLACEMENT PAVING
Reconstruction of and full replacement of an existing paved (impervious) surface.
RETENTION BASIN
A structure in which stormwater is stored and not released during the storm event. Retention basins are designed for infiltration purposes and do not have an outlet. The retention basin must infiltrate stored water in four days or less.
RETURN PERIOD
The average interval, in years, within which a storm event of a given magnitude can be expected to recur. For example, the twenty-five-year-return-period rainfall would be expected to recur on the average of once every 25 years.
RISER
A vertical pipe extending from the bottom of a pond that is used to control the discharge rate from the pond for a specified design storm.
ROAD MAINTENANCE
Earth disturbance activities within the existing road cross section, such as grading and repairing existing unpaved road surfaces, cutting road banks, cleaning or clearing drainage ditches, and other similar activities.
ROOF DRAINS
A drainage conduit or pipe that collects water runoff from a roof and leads it away from the structure.
ROOFTOP DETENTION
The temporary ponding and gradual release of stormwater falling directly onto flat roof surfaces using controlled-flow roof drains in building designs.
RUNOFF
Any part of precipitation that flows over the land surface.
SALDO
Subdivision and Land Development Ordinance.
SEDIMENT BASIN
A barrier, dam, or retention or detention basin located and designed in such a way as to retain rock, sand, gravel, silt, or other material transported by water during construction.
SEDIMENT POLLUTION
The placement, discharge, or any other introduction of sediment into the waters of the commonwealth.
SEDIMENTATION
The process by which mineral or organic matter is accumulated or deposited by the movement of water or air.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with loose stone or similar coarse material into which surface water is directed for infiltration into the underground water.
SEPARATE STORM SEWER SYSTEM
A conveyance or system of conveyances (including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains) primarily used for collecting and conveying stormwater runoff.
SHALLOW CONCENTRATED FLOW
Stormwater runoff flowing in shallow, defined ruts prior to entering a defined channel or waterway.
SHEET FLOW
A flow process associated with broad, shallow water movement on sloping ground surfaces that is not channelized or concentrated.
SOIL COVER COMPLEX METHOD
A method of runoff computation developed by NRCS that is based on relating soil type and land use/cover to a runoff parameter called curve number (CN).
SOURCE WATER PROTECTION AREAS (SWPA)
The zone through which contaminants, if present, are likely to migrate and reach a drinking water well or surface water intake.
SPECIAL PROTECTION SUBWATERSHEDS
Watersheds that have been designated by DEP as EV or HQ waters.
SPILLWAY
A conveyance that is used to pass the peak discharge of the maximum design storm that is controlled by the stormwater facility.
STORAGE INDICATION METHOD
A reservoir routing procedure based on solution of the continuity equation (inflow minus outflow equals the change in storage) with outflow defined as a function of storage volume and depth.
STORM FREQUENCY
The number of times that a given storm "event" occurs or is exceeded on the average in a stated period of years (see "return period").
STORM SEWER
A system of pipes and/or open channels that conveys intercepted runoff and stormwater from other sources but excludes domestic sewage and industrial wastes.
STORMWATER
The surface runoff generated by precipitation reaching the ground surface.
STORMWATER MANAGEMENT DISTRICT
Those subareas of a watershed in which some type of detention is required to meet the plan requirements and the goals of Act 167.
STORMWATER MANAGEMENT FACILITY
Any structure, natural or man-made, that, due to its condition, design or construction, conveys, stores or otherwise affects stormwater runoff quality, rate, or quantity. Typical stormwater management facilities include, but are not limited to, detention and retention basins, open channels, storm sewers, pipes and infiltration structures.
STORMWATER MANAGEMENT PLAN
The watershed plan, known as the "Darby and Cobbs Creeks Watershed Act 167 Stormwater Management Plan," for managing those land use activities that will influence stormwater runoff quality and quantity and that would impact the Darby and Cobbs Creeks watershed adopted by Delaware County, Chester County, Montgomery County and Philadelphia County as required by the Act of October 4, 1978, P.L. 864 (Act 167).
STORMWATER MANAGEMENT SITE PLAN
The plan prepared by the applicant or his representative indicating how stormwater runoff will be managed at the particular site of interest according to this article.
STREAM
A natural watercourse.
STREAM BUFFER
The land area adjacent to each side of a stream essential to maintaining water quality (see "buffer").
STREAM ENCLOSURE
A bridge, culvert, or other structure in excess of 100 feet in length upstream to downstream which encloses a regulated water of the commonwealth.
SUBAREA (SUBWATERSHED)
The smallest drainage unit of a watershed for which stormwater management criteria have been established in the stormwater management plan.
SUBDIVISION
The division or redivision of a lot, tract, or parcel of land by any means into two or more lots, tracts, parcels, or other divisions of land including changes in existing lot lines for the purpose, whether immediate or future, of lease, partition by the court for distribution to heirs or devisees, transfer of ownership, or building or lot development; provided, however, that the subdivision by lease of land for agricultural purposes into parcels of more than 10 acres not involving any new street or easement of access or any residential dwelling shall be exempted.
SURFACE WATERS OF THE COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, ditches, watercourses, storm sewers, lakes, dammed water, wetlands, ponds, springs, and all other bodies or channels of conveyance of surface waters, or parts thereof, whether natural or artificial, within or on the boundaries of the commonwealth.
SWALE
A low-lying stretch of land that gathers or carries surface water runoff.
TIMBER OPERATIONS
See "forest management."
TIME-OF-CONCENTRATION (Tc)
The time required for surface runoff to travel from the hydraulically most distant point of the watershed to a point of interest within the watershed. This time is the combined total of overland flow time and flow time in pipes or channels, if any.
TOP-OF-BANK
Highest point of elevation in a stream channel cross section at which a rising water level just begins to flow out of the channel and over the floodplain.
UNDEVELOPED CONDITION
Natural condition (see also "predevelopment condition").
VERNAL POND
Seasonal depressional wetlands that are covered by shallow water for variable periods from winter to spring but may be completely dry for most of the summer and fall.
WATERCOURSE
A channel or conveyance of surface water having a defined bed and banks, whether natural or artificial, with perennial or intermittent flow.
WATERS OF THE COMMONWEALTH
Any and all rivers, streams, creeks, rivulets, ditches, watercourses, storm sewers, lakes, dammed water, wetlands, ponds, springs, and all other bodies or channels of conveyance of surface and underground water, or parts thereof, whether natural or artificial, within or on the boundaries of the commonwealth.
WATERSHED
Region or area drained by a river, watercourse, or other body of water, whether natural or artificial.
A. 
A structure built over a well;
B. 
The source of water for a well.
WELLHEAD PROTECTION AREA
The surface and subsurface area surrounding a water supply well, well field, or spring supplying a public water system through which contaminants are reasonably likely to move toward and reach the water source.
WET BASIN
Pond for urban runoff management that is designed to detain urban runoff and always contains water.
WETLAND
Those areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs, fens and similar areas.
WOODS
A natural ground cover with more than one viable tree of a DBH of six inches or greater per 1,500 square feet which existed within three years of application; a cover condition for which SCS curve numbers have been assigned or to which equivalent rational method runoff coefficients have been assigned.
For any of the activities regulated by this article, the preliminary or final approval of subdivision and/or land development plans, the issuance of any building or occupancy permit, or the commencement of any earth disturbance activity may not proceed until the property owner or applicant or his/her agent has received written approval of a drainage plan from Haverford Township and an adequate erosion and sediment control plan review by the Conservation District.
The drainage plan shall consist of a general description of the project including sequencing items described in § 78-33, calculations, maps, and plans. A note on the maps shall refer to the associated computations and erosion and sediment control plan by title and date. The cover sheet of the computations and erosion and sediment control plan shall refer to the associated maps by title and date. All drainage plan materials shall be submitted to Haverford Township in a format that is clear, concise, legible, neat, and well organized; otherwise, the drainage plan shall not be accepted for review and shall be returned to the applicant. The following items shall be included in the drainage plan:
A. 
General.
(1) 
General description of the project including those areas described in § 78-33B.
(2) 
General description of proposed permanent stormwater management techniques, including construction specifications of the materials to be used for stormwater management facilities.
(3) 
Complete hydrologic, hydraulic, and structural computations for all stormwater management facilities.
(4) 
An erosion and sediment control plan, including all reviews and letters of adequacy from the Conservation District.
(5) 
A general description of proposed nonpoint source pollution controls.
(6) 
The Drainage Plan Application and completed fee schedule form and associated fee (Appendix C-1).[1]
[1]
Editor's Note: Said Appendix C-1 is included at the end of this chapter.
(7) 
The Drainage Plan Checklist (Appendix C-2).[2]
[2]
Editor's Note: Said Appendix C-2 is included at the end of this chapter.
B. 
Maps. Map(s) of the project area shall be submitted on twenty-four-inch by thirty-six-inch sheets and/or shall be prepared in a form that meets the requirements for recording at the offices of the Recorder of Deeds of Delaware County. If the SALDO has more stringent criteria than this article, then the more stringent criteria shall apply. The contents of the map(s) shall include, but not be limited to:
(1) 
The location of the project relative to highways, municipal boundaries, or other identifiable landmarks.
(2) 
Existing contours at intervals of two feet.
(3) 
Existing streams, lakes, ponds, or other waters of the commonwealth within the project area.
(4) 
Other physical features including flood hazard boundaries, stream buffers, existing drainage courses, areas of natural vegetation to be preserved, and the total extent of the upstream area draining through the site.
(5) 
The locations of all existing and proposed utilities, sanitary sewers, and water lines within 50 feet of property lines.
(6) 
An overlay showing soil names and boundaries.
(7) 
Limits of earth disturbance, including the type and amount of impervious area that would be added.
(8) 
Proposed structures, roads, paved areas, and buildings.
(9) 
Final contours at intervals of two feet.
(10) 
The name of the development, the name and address of the owner of the property, and the name of the individual or firm preparing the plan.
(11) 
The date of submission.
(12) 
A graphic and written scale of one inch equals no more than 50 feet; for tracts of 20 acres or more, the scale shall be one inch equals no more than 100 feet.
(13) 
A north arrow.
(14) 
The total tract boundary and size with distances marked to the nearest foot and bearings to the nearest degree.
(15) 
Existing and proposed land use(s).
(16) 
A key map showing all existing man-made features beyond the property boundary that would be affected by the project.
(17) 
Location of all open channels.
(18) 
Overland drainage patterns and swales.
(19) 
A fifteen-foot-wide access easement around all stormwater management facilities that would provide ingress to and egress from a public right-of-way.
(20) 
The location of all erosion and sediment control facilities.
(21) 
A note on the plan indicating the location and responsibility for maintenance of stormwater management facilities that would be located off site.
All off-site facilities shall meet the performance standards and design criteria specified in this article.
(22) 
A statement, signed by the applicant, acknowledging that any revision to the approved drainage plan must be approved by Haverford Township, and that a revised erosion and sediment control plan must be submitted to the Conservation District for a determination of adequacy.
(23) 
The following signature block for the design engineer:
"I, (Design Engineer), on this date (date of signature), hereby certify that the drainage plan meets all design standards and criteria of the Haverford Township Stormwater Management Code."
C. 
Supplemental information to be submitted to Haverford Township.
(1) 
A written description of the following information shall be submitted by the applicant and shall include:
(a) 
The overall stormwater management concept for the project designed in accordance with § 78-33.
(b) 
Stormwater runoff computations as specified in this article.
(c) 
Stormwater management techniques to be applied both during and after development.
(d) 
Expected project time schedule.
(e) 
Development stages or project phases, if so proposed.
(f) 
An operations and maintenance plan in accordance with § 78-44 of this article.
(2) 
An erosion and sediment control plan.
(3) 
A description of the effect of the project (in terms of runoff volumes and peak flows) on adjacent properties and on any existing municipal stormwater collection system that may receive runoff from the project site.
(4) 
A declaration of adequacy and highway occupancy permit from the Pennsylvania Department of Transportation (PennDOT) District office when utilization of a PennDOT storm drainage system is proposed.
D. 
Stormwater management facilities.
(1) 
All stormwater management facilities must be located on a plan and described in detail.
(2) 
When infiltration measures such as seepage pits, beds or trenches are used, the locations of existing and proposed septic tank infiltration areas and wells must be shown.
(3) 
All calculations, assumptions, and criteria used in the design of the stormwater management facilities must be shown.
Haverford Township shall require receipt of a complete drainage plan, as specified in this article.
A. 
Proof of application or documentation of required permit(s) or approvals for the programs listed below shall be part of the plan:
(1) 
NPDES permit for stormwater discharges from construction activities.
(2) 
DEP joint permit application.
(3) 
PennDOT highway occupancy permit.
(4) 
Chapter 105 (Dam Safety and Waterway Management).
(5) 
Chapter 106 (Floodplain Management).
(6) 
Any other permit under applicable state or federal regulations.
B. 
The plan shall be coordinated with the state and federal permit process and the municipal SALDO review process. The process implementing the provisions in this article is illustrated in Appendixes D-1 and D-2.[1]
[1]
Editor's Note: Said appendixes are included at the end of this chapter.
C. 
For projects that require SALDO approval, the drainage plan shall be submitted by the applicant as part of the preliminary plan submission where applicable for the regulated activity.
D. 
For regulated activities that do not require SALDO approval, see § 78-24, General drainage plan requirements.
E. 
Six copies of the drainage plan shall be submitted and distributed as follows:
(1) 
Two copies to Haverford Township accompanied by the requisite municipal review fee, as specified in this article.
(2) 
Two copies to the County Conservation District.
(3) 
One copy to the municipal Engineer.
(4) 
One copy to the County Planning Commission/Department.
F. 
Any submissions to the agencies listed above that are found to be incomplete shall not be accepted for review and shall be returned to the applicant with a notification in writing of the specific manner in which the submission is incomplete.
A. 
The municipal Engineer shall review the drainage plan for consistency with this article and the respective Act 167 stormwater management plan. Any found incomplete shall not be accepted for review and shall be returned to the applicant.
B. 
The municipal Engineer shall review the drainage plan for any subdivision or land development against the municipal SALDO provisions not otherwise superseded by this article.
C. 
The Conservation District, in accordance with established criteria and procedures, shall review the drainage plan for consistency with stormwater management and erosion and sediment pollution control requirements and provide comments to Haverford Township. Such comments shall be considered by Haverford Township prior to final approval of the drainage plan.
D. 
For activities regulated by this article, the municipal Engineer shall notify the applicant and Haverford Township in writing whether the drainage plan is consistent with the stormwater management plan.
(1) 
If the municipal Engineer determines that the drainage plan is consistent with the stormwater management plan, the municipal Engineer shall forward a letter of consistency to the municipal Secretary who will then forward a copy to the applicant.
(2) 
If the municipal Engineer determines that the drainage plan is inconsistent or noncompliant with the stormwater management plan, the municipal Engineer shall forward a letter to the municipal Secretary with a copy to the applicant citing the reason(s) and specific Code sections for the inconsistency or noncompliance. Inconsistency or noncompliance may be due to inadequate information to make a reasonable judgment as to compliance with the stormwater management plan. Any drainage plans that are inconsistent or noncompliant may be revised by the applicant and resubmitted when consistent with this article. The municipal Secretary shall then notify the applicant of the municipal Engineer's findings. Any inconsistent or noncompliant drainage plans may be revised by the applicant and resubmitted consistent with this article.
E. 
For regulated activities specified in § 78-17 of this article that require a building permit, the municipal Engineer shall notify the municipal Building Permit Officer in writing whether the drainage plan is consistent with the stormwater management plan. The municipal Building Permit Officer shall forward a copy of the consistency/inconsistency letter to the applicant. Any drainage plan deemed inconsistent may be revised by the applicant and resubmitted consistent with this article.
F. 
For regulated activities under this article that require an NPDES permit application, the applicant shall forward a copy of the municipal Engineer's letter stating that the drainage plan is consistent with the stormwater management plan to the Conservation District. DEP and the Conservation District may consider the municipal Engineer's review comments in determining whether to issue a permit.
G. 
Haverford Township shall not grant preliminary or final approval to any subdivision or land development for regulated activities specified in § 78-17 of this article if the drainage plan has been found by the municipal Engineer to be inconsistent with the stormwater management plan. All required permits from DEP must be obtained prior to approval of any subdivision or land development.
H. 
No building permits for any regulated activity specified in § 78-17 of this article shall be approved by Haverford Township if the drainage plan has been found to be inconsistent with the stormwater management plan, as determined by the municipal Engineer and Conservation District, or without considering the comments of the municipal Engineer and Conservation District. All required permits from DEP must be obtained prior to issuance of a building permit.
I. 
The Applicant shall be responsible for completing record drawings of all stormwater management facilities included in the approved drainage plan. The record drawings and an explanation of any discrepancies with the design plans shall be submitted to the municipal Engineer for final approval. In no case shall Haverford Township approve the record drawings until Haverford Township receives a copy of an approved declaration of adequacy and/or highway occupancy permit from the PennDOT District office, NPDES permit, and any other applicable permits or approvals from DEP or the Conservation District. The above permits and approvals must be based on the record drawings.
J. 
Haverford Township's approval of a drainage plan shall be valid for a period not to exceed five years commencing on the date that Haverford Township signs the approved drainage plan. If stormwater management facilities included in the approved drainage plan have not been constructed, or if constructed, record drawings of these facilities have not been approved within this five-year time period, then Haverford Township may consider the drainage plan inconsistent or noncompliant and may revoke any and all permits. Drainage plans that are determined to be inconsistent or noncompliant by Haverford Township shall be resubmitted in accordance with § 78-29 of this article.
A. 
A modification to a submitted drainage plan under review by Haverford Township for a development site that involves the following shall require a resubmission to Haverford Township of a modified drainage plan consistent with § 78-26 of this article and be subject to review as specified in § 78-27 of this article:
(1) 
Change in stormwater management facilities or techniques;
(2) 
Relocation or redesign of stormwater management facilities; or
(3) 
Is necessary because soil or other conditions are not as stated on the drainage plan as determined by the municipal Engineer.
B. 
A modification to an already approved or inconsistent or noncompliant drainage plan shall be submitted to Haverford Township, accompanied by the applicable municipal review and inspection fee. A modification to a drainage plan for which a formal action has not been taken by Haverford Township shall be submitted to Haverford Township accompanied by the applicable municipal review and inspection fee.
An inconsistent or noncompliant drainage plan may be resubmitted with the revisions addressing the municipal Engineer's concerns documented in writing. It must be addressed to the municipal Secretary in accordance with § 78-26 of this article, distributed accordingly, and be subject to review as specified in § 78-27 of this article. The applicable municipal review and inspection fee must accompany a resubmission of an inconsistent or noncompliant drainage plan.
A. 
Applicants proposing regulated activities in Haverford Township which do not fall under the exemption criteria shown in § 78-18 shall submit a drainage plan consistent with this article and the respective stormwater management plan to Haverford Township for review. The stormwater management criteria of this article shall apply to the total proposed development even if development is to take place in stages.
B. 
The applicant is required to find practicable alternatives to the surface discharge of stormwater, the creation of impervious surfaces, and the degradation of waters of the commonwealth and must maintain as much as possible the natural hydrologic regime.
C. 
The drainage plan must be designed consistent with the sequencing provisions of § 78-33 to ensure maintenance of the natural hydrologic regime, to promote groundwater recharge, and to protect groundwater and surface water quality and quantity. The drainage plan designer must proceed sequentially in accordance with this article.
D. 
Stormwater drainage systems shall be designed in order to permit unimpeded flow along natural watercourses, except as modified by stormwater management facilities or open channels consistent with this article.
E. 
Existing points of concentrated drainage that discharge onto adjacent property shall not be altered in any manner which could cause property damage without permission of the affected property owner(s) and shall be subject to any applicable discharge criteria specified in this article.
F. 
Areas of existing diffused drainage discharge, whether proposed to be concentrated or maintained as diffused drainage areas, shall be subject to any applicable discharge criteria in the general direction of existing discharge, except as otherwise provided by this article. If diffused drainage discharge is proposed to be concentrated and discharged onto adjacent property, the applicant must document that adequate downstream conveyance facilities exist to safely transport the concentrated discharge or otherwise prove that no erosion, sedimentation, flooding, or other impacts will result from the concentrated discharge.
G. 
Where a development site is traversed by existing streams, drainage easements shall be provided conforming to the line of such streams. The terms of the easement shall conform to the stream buffer requirements contained in § 78-35G of this article.
H. 
Any stormwater management facilities regulated by this article that would be located in or adjacent to waters of the commonwealth or delineated wetlands shall be subject to approval by DEP through the joint permit application or the environmental assessment approval process or, where deemed appropriate, by the DEP general permit process. When there is a question as to whether wetlands may be involved, it is the responsibility of the applicant or his agent to show that the land in question cannot be classified as wetlands; otherwise, approval to work in the area must be obtained from DEP.
I. 
Any proposed stormwater management facilities regulated by this article that would be located on state highway rights-of-way shall be subject to approval by PennDOT.
J. 
Minimization of impervious surfaces and infiltration of runoff through seepage beds, infiltration trenches, etc., is encouraged where soil conditions permit in order to reduce the size or eliminate the need for detention facilities or other structural BMPs.
K. 
All stormwater runoff shall be pretreated for water quality prior to discharge to surface or groundwater.
L. 
All regulated activities within Haverford Township shall be designed, implemented, operated, and maintained to meet the purposes of this article through these two elements:
(1) 
Erosion and sediment control during earth disturbance activities (e.g., during construction); and
(2) 
Water quality protection measures after completion of earth disturbance activities (i.e., after construction), including operations and maintenance.
M. 
No regulated earth disturbance activities within Haverford Township shall commence until the requirements of this article are met.
N. 
Postconstruction water quality protection shall be addressed as required by § 78-35.
O. 
Operations and maintenance of permanent stormwater BMPs shall be addressed as required by this article.
P. 
All BMPs used to meet the requirements of this article shall conform to the state water quality requirements and any more stringent requirements as set forth by Haverford Township.
Q. 
Techniques described in Appendix E[1] (Low Impact Development) of this article shall be considered because they reduce the costs of complying with the requirements of this article and the state water quality requirements.
[1]
Editor's Note: Said appendix is included at the end of this chapter.
R. 
In selecting the appropriate BMPs or combinations thereof, the applicant shall consider the following:
(1) 
Total contributing area.
(2) 
Permeability and infiltration rate of the site's soils.
(3) 
Slope and depth to bedrock.
(4) 
Seasonal high water table.
(5) 
Proximity to building foundations and wellheads.
(6) 
Erodibility of soils.
(7) 
Land availability and configuration of the topography.
(8) 
Peak discharge and required volume control.
(9) 
Streambank erosion.
(10) 
Efficiency of the BMPs to mitigate potential water quality problems.
(11) 
The volume of runoff that will be effectively treated.
(12) 
The nature of the pollutant being removed.
(13) 
Maintenance requirements.
(14) 
Creation/protection of aquatic and wildlife habitat.
(15) 
Recreational value.
S. 
The applicant may meet the stormwater management criteria through off-site stormwater management measures as long as the proposed measures are in the same subwatershed as shown in Appendix A.[2]
[2]
Editor's Note: Appendix A, Darby-Cobbs Stormwater Management District Watershed Map, is included at the end of this chapter.
The following permit requirements may apply to certain regulated earth disturbance activities and must be met prior to commencement of regulated earth disturbance activities, as applicable:
A. 
All regulated earth disturbance activities subject to permit requirements by DEP under regulations at 25 Pennsylvania Code Chapter 102.
B. 
Work within natural drainageways subject to permit by DEP under 25 Pennsylvania Code Chapter 105.
C. 
Any stormwater management facility that would be located in or adjacent to surface waters of the commonwealth, including wetlands, subject to permit by DEP under 25 Pennsylvania Code Chapter 105.
D. 
Any stormwater management facility that would be located on a state highway right-of-way or require access from a state highway shall be subject to approval by PennDOT.
E. 
Culverts, bridges, storm sewers, or any other facilities which must pass or convey flows from the tributary area and any facility which may constitute a dam, subject to permit by DEP under 25 Pennsylvania Code Chapter 105.
A. 
No regulated earth disturbance activities within Haverford Township shall commence until Haverford Township receives an approval from the Conservation District of an erosion and sediment control plan for construction activities.
B. 
DEP has regulations that require an erosion and sediment control plan for any earth disturbance activity of 5,000 square feet or more, under 25 Pennsylvania Code § 102.4(b).
C. 
In addition, under 25 Pennsylvania Code Chapter 92, a DEP "NPDES construction activities" permit is required for regulated earth disturbance activities. Evidence of any necessary permit(s) for regulated earth disturbance activities from the appropriate DEP regional office or County Conservation District must be provided to Haverford Township.
D. 
A copy of the erosion and sediment control plan and any required permit, as required by DEP regulations, shall be available on the project site at all times.
E. 
Additional erosion and sediment control design standards and criteria are recommended to be applied where infiltration BMPs are proposed. They shall include the following:
(1) 
Areas proposed for infiltration BMPs shall be protected from sedimentation and compaction during the construction phase to maintain maximum infiltration capacity.
(2) 
Infiltration BMPs shall not be constructed nor receive runoff until the entire drainage area contributory to the infiltration BMP has achieved final stabilization.
A. 
The design of all regulated activities shall include the following to minimize stormwater impacts.
(1) 
The applicant shall find practicable alternatives to the surface discharge of stormwater, such as those listed in Appendix F,[1] Table F-5, the creation of impervious surfaces, and the degradation of waters of the commonwealth and must maintain as much as possible the natural hydrologic regime of the site.
[1]
Editor's Note: Appendix F, Stormwater Management Design Criteria is included at the end of this chapter.
(2) 
An alternative is practicable if it is available and capable of implementation after taking into consideration existing technology and logistics in light of overall project purposes and other municipal requirements.
(3) 
All practicable alternatives to the discharge of stormwater are presumed to have less adverse impact on quantity and quality of waters of the commonwealth unless otherwise demonstrated.
B. 
The applicant shall demonstrate that the regulated activities were designed in the following sequence. The goal of the sequence is to minimize the increases in stormwater runoff and impacts to water quality resulting from the proposed regulated activity:
(1) 
Prepare an existing resource and site analysis map (ERSAM) showing environmentally sensitive areas, including but not limited to, steep slopes, ponds, lakes, streams, wetlands, hydric soils, vernal pools, stream buffers and hydrologic soil groups. Land development, any existing recharge areas, and other requirements outlined in the municipal SALDO shall also be included.
(2) 
Establish a stream buffer according to § 78-35G.
(3) 
Prepare a draft project layout avoiding sensitive areas identified in Subsection B(1).
(4) 
Identify site-specific existing conditions drainage areas, discharge points, recharge areas, and hydrologic soil groups A and B (areas conducive to infiltration).
(5) 
Evaluate nonstructural stormwater management alternatives:
(a) 
Minimize earth disturbance.
(b) 
Minimize impervious surfaces.
(c) 
Break up large impervious surfaces.
(6) 
Satisfy the groundwater recharge (infiltration) objective (§ 78-34) and provide for stormwater pretreatment prior to infiltration.
(7) 
Provide for water quality protection in accordance with § 78-35 water quality requirements.
(8) 
Provide streambank erosion protection in accordance with § 78-36 streambank erosion requirements.
(9) 
Determine into what management district the site falls (Appendix A[2]) and conduct an existing conditions runoff analysis.
[2]
Editor's Note: Appendix A is included at the end of this chapter.
(10) 
Prepare final project design to maintain existing conditions drainage areas and discharge points, to minimize earth disturbance and impervious surfaces and, to the maximum extent possible, to ensure that the remaining site development has no surface or point discharge.
(11) 
Conduct a proposed conditions runoff analysis based on the final design that meets the management district requirements (§ 78-37).
(12) 
Manage any remaining runoff prior to discharge through detention, bioretention, direct discharge or other structural control.
Maximizing the groundwater recharge capacity of the area being developed is required. Design of the infiltration facilities shall consider groundwater recharge to compensate for the reduction in the recharge that occurs when the ground surface is disturbed or impervious surface is created. It is recommended that roof runoff be directed to infiltration BMPs that may be designed to compensate for the runoff from parking areas. These measures are required to be consistent with § 78-15 and to take advantage of utilizing any existing recharge areas. Infiltration may not be feasible on every site due to site-specific limitations such as soil type. If it cannot be physically accomplished, then the design professional shall be responsible to show that this cannot be physically accomplished. If it can be physically accomplished, then the volume of runoff to be infiltrated shall be determined from § 78-34A(2) depending on demonstrated site conditions and shall be the greater of the volumes.
A. 
Infiltration BMPs shall meet the following minimum requirements:
(1) 
Infiltration BMPs intended to receive runoff from developed areas shall be selected based on suitability of soils and site conditions and shall be constructed on soils that have the following characteristics:
(a) 
A minimum depth of 24 inches between the bottom of the BMP and the top of the limiting zone.
(b) 
An infiltration rate sufficient to accept the additional stormwater load and dewater completely as determined by field tests conducted by the applicant's design professional.
(c) 
The infiltration facility shall be capable of completely infiltrating the retention (infiltration) volume (Rev) below grade within four days (96 hours).
(d) 
Pretreatment shall be provided prior to infiltration.
(2) 
The size of the infiltration facility shall be based upon the following volume criteria:
(a) 
Net two-year volume approach. In HQ/EV watersheds, the retention (infiltration) volume (Rev) to be captured and infiltrated shall be the net two-year volume. The net two-year volume shall be determined by plotting the two-year project site postdevelopment hydrograph, drawing a straight line from the point-of-inflection of the rising limb of the hydrograph to the predevelopment two-year storm, and measuring the volume under the curve as shown in Figure 405.1.
(b) 
One inch from impervious surface. In other portions of the watershed that are not classified as HQ/EV, the retention (infiltration) volume (Rev) will be equal to capturing one inch of rainfall over all proposed impervious surfaces.
Rev = I * impervious area square feet @ 12 (inches) = cubic feet (cf)
An asterisk (*) in equations denotes multiplication.
(c) 
Obtaining the Rev volume in § 78-34A(2)(a), above, may not be feasible on every site due to site-specific limitations such as soil type. If it cannot be physically accomplished, then the design professional shall be responsible for showing that this cannot be physically accomplished. If it cannot be physically accomplished, then the retention (infiltration) volume Rev required shall be as much as can be physically accomplished with a minimum of 0.50 inch depending on demonstrated site conditions. It has been determined that capturing and infiltrating 0.50 inch of runoff from the impervious areas will aid in maintaining the hydrologic regime (baseflow) of the watershed. If the goals of § 78-34A(2)(a) or (b) cannot be achieved, then 0.50 inch of rainfall shall be retained and infiltrated from all impervious areas.
The minimum recharge volume (Rev) required would, therefore, be computed as:
Rev * impervious area (square feet) @ 12 (inches) = cubic feet (cf)
An asterisk (*) in equations denotes multiplication.
Where:
I
=
The maximum equivalent infiltration amount (inches) that the site can physically accept or 0.50 inch, whichever is greater.
The retention volume values derived from the methods in § 78-34A(2)(a), is the minimum volume the applicant must control through an infiltration BMP facility. However, if a site has areas of soils where additional volume of retention can be achieved, the applicant is encouraged to infiltrate as much of the stormwater runoff from the site as possible.
If the minimum of 0.50 inch of infiltration requirement cannot be achieved, a waiver from Section 405, Groundwater Recharge, would be required from Haverford Township.
B. 
Soils. A detailed soils evaluation of the project site shall be required to determine the suitability of infiltration facilities. The evaluation shall be performed by a qualified design professional and at a minimum address soil permeability, depth to bedrock, and subgrade stability. The general process for designing the infiltration BMP shall be:
(1) 
Analyze hydrologic soil groups as well as natural and man-made features within the site to determine general areas of suitability for infiltration practices. In areas where development on fill material is under consideration, conduct geotechnical investigations of subgrade stability; infiltration may not be ruled out without conducting these tests.
(2) 
Provide field tests such as double ring infiltrometer or hydraulic conductivity tests (at the level of the proposed infiltration surface) to determine the appropriate hydraulic conductivity rate. If approved, percolation tests may be used for design purposes.
(3) 
Design the infiltration structure for the required retention (Rev) volume based on field-determined capacity at the level of the proposed infiltration surface.
(4) 
If on-lot infiltration structures are proposed by the applicant's design professional, it must be demonstrated to Haverford Township that the soils are conducive to infiltrate on the lots identified.
C. 
Stormwater hotspots.
(1) 
Below is a list of examples of designated hotspots. If a site is designated as a hotspot, it has important implications for how stormwater is managed. First and foremost, untreated stormwater runoff from hotspots shall not be allowed to recharge into groundwater where it may contaminate water supplies. Therefore, the Rev requirement shall NOT be applied to development sites that fit into the hotspot category (the entire WQv must still be treated). Second, a greater level of stormwater treatment shall be considered at hotspot sites to prevent pollutant wash off after construction. The Environmental Protection Agency's (EPA) NPDES stormwater program requires some industrial sites to prepare and implement a stormwater pollution prevention plan.
(a) 
Examples of hotspots:
Vehicle salvage yards and recycling facilities
Vehicle fueling stations
Vehicle service and maintenance facilities
Vehicle and equipment cleaning facilities
Fleet storage areas (bus, truck, etc.)
Industrial sites based on Standard Industrial Codes
Marinas (service and maintenance)
Outdoor liquid container storage
Outdoor loading/unloading facilities
Public works storage areas
Facilities that generate or store hazardous materials
Commercial container nursery
Other land uses and activities as designated by an appropriate review authority
(b) 
The following land uses and activities are not normally considered hotspots:
Residential streets and rural highways
Residential development
Institutional development
Office developments
Nonindustrial rooftops
Pervious areas, except golf courses and nurseries [which may need an integrated pest management (IPM) plan].
(2) 
While large highways [average daily traffic volume (ADT) greater than 30,000] are not designated as stormwater hotspots, it is important to ensure that highway stormwater management plans adequately protect groundwater.
D. 
Extreme caution shall be exercised where infiltration is proposed in SWPAs as defined by the local municipality or water authority.
E. 
Infiltration facilities shall be used in conjunction with other innovative or traditional BMPs, stormwater control facilities, and nonstructural stormwater management alternatives.
F. 
Extreme caution shall be exercised where salt or chloride (municipal salt storage) would be a pollutant since soils do little to filter this pollutant, and it may contaminate the groundwater. The qualified design professional shall evaluate the possibility of groundwater contamination from the proposed infiltration facility and perform a hydrogeologic justification study if necessary.
G. 
The infiltration requirement in HQ or EV waters shall be subject to the Department's Chapter 93 Antidegradation Regulations.
H. 
An impermeable liner will be required in detention basins where the possibility of groundwater contamination exists. A detailed hydrogeologic investigation may be required by Haverford Township.
I. 
Haverford Township shall require the applicant to provide safeguards against groundwater contamination for land uses that may cause groundwater contamination should there be a mishap or spill.
The applicant shall comply with the following water quality requirements of this article.
A. 
No regulated earth disturbance activities within Haverford Township shall commence until approval by Haverford Township of a plan which demonstrates compliance with postconstruction state water quality requirements.
B. 
The BMPs shall be designed, implemented, and maintained to meet state water quality requirements and any other more stringent requirements as determined by Haverford Township.
C. 
To control postconstruction stormwater impacts from regulated earth disturbance activities, state water quality requirements can be met by BMPs, including site design, which provide for replication of preconstruction stormwater infiltration and runoff conditions so that postconstruction stormwater discharges do not degrade the physical, chemical, or biological characteristics of the receiving waters. As described in the DEP Comprehensive Stormwater Management Policy (No. 392-0300-002, September 28, 2002), this may be achieved by the following:
(1) 
Infiltration: replication of preconstruction stormwater infiltration conditions;
(2) 
Treatment: use of water quality treatment BMPs to ensure filtering out of the chemical and physical pollutants from the stormwater runoff; and
(3) 
Streambank and streambed protection: management of volume and rate of postconstruction stormwater discharges to prevent physical degradation of receiving waters (e.g., from scouring).
D. 
Developed areas shall provide adequate storage and treatment facilities necessary to capture and treat stormwater runoff. The retention volume computed under § 78-34 may be a component of the water quality volume if the applicant chooses to manage both components in a single facility. If the retention volume is less than the water quality volume, the remaining water quality volume may be captured and treated by methods other than infiltration BMPs. The required water quality volume (WQv) is the storage capacity needed to capture and treat a portion of stormwater runoff from the developed areas of the site.
(1) 
To achieve this goal, the following criterion is established:
(a) 
The following calculation formula is to be used to determine the water quality storage volume (WQv) in acre-feet of storage required by this article:
WQv = [(P)(Rv)(A)] @ 12
WHERE:
WQv
=
Water quality volume (acre-feet)
P
=
1 inch
A
=
Area of the project contributing to the water quality BMP (acres)
Rv
=
0.05 + 0.009(I) where I is the percent of the area that is impervious surface (impervious area/A)*100)
(b) 
This volume requirement can be accomplished by the permanent volume of a wet basin or the detained volume from other BMPs. Where appropriate, wet basins shall be utilized for water quality control and shall follow the guidelines of the BMP manuals referenced in Appendix G.[1]
[1]
Editor's Note: Appendix G, a bibliography of reference materials, is on file in the Township's Zoning Office.
(2) 
Release of water can begin at the start of the storm (i.e., the invert of the water quality orifice is at the invert of the facility). The design of the facility shall provide for protection from clogging and unwanted sedimentation.
E. 
For areas within defined special protection subwatersheds that include EV and HQ waters, the temperature and quality of water and streams shall be maintained through the use of temperature-sensitive BMPs and stormwater conveyance systems.
F. 
To accomplish the above, the applicant shall submit original and innovative designs to the municipal Engineer for review and approval. Such designs may achieve the water quality objectives through a combination of different BMPs.
G. 
If a perennial or intermittent stream passes through the site, the applicant shall create a stream buffer extending a minimum of 50 feet to either side of the top-of-bank of the channel. The buffer area shall be maintained with and encouraged to use appropriate native vegetation (refer to Appendix H of the Pennsylvania Handbook of Best Management Practices for Developing Areas for plant lists). If the applicable rear or side yard setback is less than 50 feet, the buffer width may be reduced to 25% of the setback to a minimum of 10 feet. If an existing buffer is legally prescribed (i.e., deed, covenant, easement, etc.) and it exceeds the requirements of this article, the existing buffer shall be maintained. This does not include lakes or wetlands.
H. 
Evidence of any necessary permit(s) for regulated earth disturbance activities from the appropriate DEP regional office must be provided to Haverford Township.
A. 
In addition to the control of water quality volume (in order to minimize the impact of stormwater runoff on downstream streambank erosion), the primary requirement is to design a BMP to detain the proposed conditions two-year, twenty-four-hour design storm to the existing conditions one-year flow using the SCS Type II distribution. Additionally, provisions shall be made (such as adding a small orifice at the bottom of the outlet structure) so that the proposed conditions one-year storm takes a minimum of 24 hours to drain from the facility from a point where the maximum volume of water from the one-year storm is captured (i.e., the maximum water surface elevation is achieved in the facility). Release of water can begin at the start of the storm (i.e., the invert of the water quality orifice is at the invert of the facility).
B. 
The minimum orifice size in the outlet structure to the BMP shall be three inches in diameter where possible, and a trash rack shall be installed to prevent clogging. On sites with small drainage areas contributing to this BMP that do not provide enough runoff volume to allow a twenty-four-hour attenuation with the three-inch orifice, the calculations shall be submitted showing this condition. Orifice sizes less than three inches can be utilized, provided that the design will prevent clogging of the intake.
C. 
In "Conditional Direct Discharge Districts" (District C) only (see § 78-37), the objective is not to attenuate the storms greater than the two-year recurrence interval. This can be accomplished by configuring the outlet structure not to control the larger storms or by a bypass channel that diverts only the two-year stormwater runoff into the basin or conversely, diverts flows in excess of the two-year storm away from the basin.
A. 
The Darby and Cobbs Creeks watershed has been divided into stormwater management districts as shown on the Management District Map in Appendix A.[1] In addition to the requirements specified in Table 408.1 below, the erosion and sedimentation control (§ 78-32), the nonstructural project design (§ 78-33), the groundwater recharge (§ 78-34), the water quality (§ 78-35), and the streambank erosion (§ 78-36) requirements shall be implemented.
(1) 
Standards for managing runoff from each subarea in the Darby and Cobbs Creeks watershed for the two-, five-, ten-, twenty-five-, fifty-, and one-hundred-year design storms are shown in Table 408.1. Development sites located in each of the management districts must control proposed conditions runoff rates to existing conditions runoff rates for the design storms in accordance with Table 408.1.
TABLE 408.1
PEAK RATE CONTROL STANDARDS BY STORMWATER
MANAGEMENT DISTRICT IN THE
DARBY-COBBS CREEK WATERSHED
District
Proposed Condition Design Storm
Existing Condition Design Storm
A
2 – year
1 – year
5 – year
5 – year
10 – year
10 – year
25 – year
25 – year
100 – year
100 – year
B-1
2 – year
1 – year
10 – year
5 – year
25 – year
10 – year
50 – year
25 – year
100 – year
100 – year
B-2
2 – year
1 – year
5 – year
2 – year
25 – year
5 – year
50 – year
10 – year
100 – year
100 – year
C
Conditional Direct Discharge District
(2) 
In District C, development sites that can discharge directly to the Darby-Cobbs Creek main channel, major tributaries, or indirectly to the main channel through an existing stormwater drainage system (i.e., storm sewer or tributary) may do so without control of the proposed conditions peak rate of runoff greater than the five-year storm. Sites in District C will still have to comply with the groundwater recharge criteria, the water quality criteria, and streambank erosion criteria. If the proposed conditions runoff is intended to be conveyed by an existing stormwater drainage system to the main channel, assurance must be provided that such system has adequate capacity to convey the flows greater than the two-year existing conditions peak flow or will be provided with improvements to furnish the required capacity. When adequate capacity in the downstream system does not exist and will not be provided through improvements, the proposed conditions peak rate of runoff must be controlled to the existing conditions peak rate as required in District A provisions (i.e., ten-year proposed conditions flows to ten-year existing conditions flows) for the specified design storms.
[1]
Editor's Note: Appendix A is located at the end of this chapter.
B. 
General. Proposed conditions rates of runoff from any regulated activity shall not exceed the peak release rates of runoff from existing conditions for the design storms specified on the Stormwater Management District Watershed Map (Appendix A) and this section of the article.
C. 
District boundaries. The boundaries of the stormwater management districts are shown on an official map that is available for inspection at the municipal and County Planning offices. A copy of the official map at a reduced scale is included in Appendix A. The exact location of the stormwater management district boundaries as they apply to a given development site shall be determined by mapping the boundaries using the two-foot topographic contours (or most accurate data required) provided as part of the drainage plan.
D. 
Sites located in more than one district. For a proposed development site located within two or more stormwater management district category subareas, the peak discharge rate from any subarea shall meet the management district criteria for which the discharge is located. The calculated peak discharges shall apply regardless of whether the grading plan changes the drainage area by subarea. An exception to the above may be granted if discharges from multiple subareas recombine in proximity to the discharge site. In this case, peak discharge in any direction may follow Management District A criteria, provided that the overall site discharge meets the management district criteria for which the discharge is located.
E. 
Off-site areas. Off-site areas that drain through a proposed development site are not subject to release rate criteria when determining allowable peak runoff rates. However, on-site drainage facilities shall be designed to safely convey off-site flows through the development site.
F. 
Site areas. Where the site area to be impacted by a proposed development activity differs significantly from the total site area, only the proposed impact area utilizing stormwater management measures shall be subject to the management district criteria. In other words, unimpacted areas bypassing the stormwater management facilities would not be subject to the management district criteria.
G. 
"No harm" option. For any proposed development site not located in a Conditional Direct Discharge District, the applicant has the option of using a less-restrictive runoff control (including no detention) if the applicant can prove that "no harm" would be caused by discharging at a higher runoff rate than that specified by the stormwater management plan. The "no harm" option is used when an Applicant can prove that the proposed conditions hydrographs can match existing conditions hydrographs and if it can be proved that the proposed conditions will not cause increases in peaks at all points downstream. Proof of "no harm" must be shown based upon the following downstream impact evaluation which shall include a downstream hydraulic capacity analysis consistent with Subsection H to determine if adequate hydraulic capacity exists. The applicant shall submit to Haverford Township this evaluation of the impacts due to increased downstream stormwater flows in the watershed.
(1) 
The hydrologic regime of the site must be maintained.
(2) 
The downstream impact evaluation shall include hydrologic and hydraulic calculations necessary to determine the impact of hydrograph timing modifications due to the proposed development upon a dam, highway, structure, natural point of restricted streamflow, or any stream channel section established with the concurrence of the municipality.
(3) 
The evaluation shall continue downstream until the increase in flow diminishes due to additional flow from tributaries and/or stream attenuation.
(4) 
The peak flow values to be used for downstream areas for the design return period storms (two-, five-, ten-, fifty-, and one-hundred-year) shall be the values from the calibrated model for the respective watershed. These flow values can be obtained from the original Act 167 watershed stormwater management plans.
(5) 
Applicant-proposed runoff controls which would generate increased peak flow rates at storm drainage problem areas would, by definition, be precluded from successful attempts to prove "no-harm," except in conjunction with proposed capacity improvements for the problem areas consistent with Subsection H.
(6) 
Financial distress shall not constitute grounds for the municipality to approve the use of the "no-harm" option.
(7) 
Capacity improvements to conveyance facilities or obstructions may be provided as necessary to implement the "no harm" option as long as it can be demonstrated through the downstream hydraulic capacity analysis that the improvements would not create any harm downstream.
(8) 
Any "no harm" justifications shall be submitted by the applicant as part of the drainage plan submission per this article.
H. 
Downstream hydraulic capacity analysis. Any downstream hydraulic capacity analysis conducted in accordance with this article shall use the following criteria for determining adequacy for accepting increased peak flow rates:
(1) 
Natural or man-made channels or swales must be able to convey the increased runoff associated with a two-year return period event within their banks at velocities consistent with protection of the channels from erosion. Acceptable velocities shall be based upon criteria included in the DEP Erosion and Sediment Pollution Control Program Manual.
(2) 
Natural or man-made channels or swales must be able to convey increased twenty-five-year return period runoff without creating any hazard to persons or property.
(3) 
Culverts, bridges, storm sewers, or any other facilities which need to pass or convey flows from the tributary area must be designed in accordance with DEP Chapter 105 regulations (if applicable) and, at minimum, pass the increased twenty-five-year return period runoff.
I. 
Alternate criteria for redevelopment sites. For redevelopment sites, one of the following minimum design parameters shall be accomplished, whichever is most appropriate for the given site conditions as determined by Haverford Township;
(1) 
Meet the full requirements specified by Table 408.1 and § 78-37A through I; or
(2) 
Reduce the total impervious surface on the site by at least 20% based upon a comparison of existing impervious surface to proposed impervious surface.
A. 
Stormwater runoff from all development sites with a drainage area of greater than 200 acres shall be calculated using a generally accepted calculation technique that is based on the NRCS soil cover complex method. Table 409.1 summarizes acceptable computation methods, and the method selected by the design professional shall be based on the individual limitations and suitability of each method for a particular site. Haverford Township may allow the use of the Rational Method to estimate peak discharges from drainage areas that contain less than 200 acres. The soil cover complex method shall be used for drainage areas greater than 200 acres.
TABLE 409.1
ACCEPTABLE COMPUTATION METHODOLOGIES
FOR STORMWATER MANAGEMENT PLANS
Method
Developed By
Applicability
TR-20 (or commercial computer package based on TR-20)
USDA NRCS
Applicable where use of full hydrology computer model is desirable or necessary.
TR-55 (or commercial computer package based on TR-55)
USDA NRCS
Applicable for land development plans where limitations described in TR-55.
HEC-1/HEC-HMS
US Army Corps of Engineers
Applicable where use of a full hydrologic computer is desirable or necessary.
PSRM
Penn State University
Applicable where use of a hydrologic model is desirable or necessary; simpler than TR-20 or HEC-1.
Rational method (or commercial computer package based on rational method)
Emil Kuichling (1889)
For sites less than 200 acres, or as approved by the municipality and/or municipal Engineer.
Other methods
Varies
Other computation methodologies approved by the municipality and/or municipal Engineer.
HEC RAS
US Army Corp of Engineers
"No harm" option
B. 
All calculations consistent with this article using the soil cover complex method shall use the appropriate design rainfall depths for the various return period storms according to the region in which they are located as presented in Table F-1 in Appendix F of this article.[1] If a hydrologic computer model such as PSRM or HEC-1/HEC-HMS is used for stormwater runoff calculations, then the duration of rainfall shall be 24 hours. The alternating block method shown in Figure F-1 or the SCS Type II S Curve, Figure F-3 in Appendix F, shall be used for the rainfall distribution.
[1]
Editor's Note: Appendix F is included at the end of this chapter.
C. 
The following criteria shall be used for runoff calculations:
(1) 
For development sites not considered redevelopment, the ground cover used in determining the existing conditions flow rates shall be as follows:
(a) 
Wooded sites shall use a ground cover of "woods in good condition." Portions of a site having more than one viable tree of a DBH of six inches or greater per 1,500 square feet shall be considered "wooded" where such trees existed within three years of application.
(b) 
The undeveloped portion of the site including agriculture, bare earth and fallow ground, shall be considered as "meadow in good condition," unless the natural ground cover generates a lower curve (CN) number or Rational "c" value (i.e., woods) as listed in Tables F-2 or F-3 in Appendix F of this article.
(2) 
For development and redevelopment sites, the ground cover used in determining the existing conditions flow rates for the developed portion of the site shall be based upon actual land cover conditions.
D. 
All calculations using the rational method shall use rainfall intensities consistent with appropriate times-of-concentration for overland flow and return periods presented in the Region 5 Curves from the PennDOT Storm-Duration-Frequency Chart (Figure F-4). Times-of-concentration for overland flow shall be calculated using the methodology presented in Chapter 3 of Urban Hydrology for Small Watersheds, NRCS, TR-55 (as amended or replaced from time to time by NRCS). Times-of-concentration for channel and pipe flow shall be computed using Manning's equation.
E. 
Runoff curve numbers (CN) for both existing and proposed conditions to be used in the soil cover complex method shall be obtained from Table F-2 in Appendix F of this article.
F. 
Runoff coefficients (c) for both existing and proposed conditions for use in the rational method shall be obtained from Table F-3 in Appendix F of this article.
G. 
Where uniform flow is anticipated, the Manning equation shall be used for hydraulic computations and to determine the capacity of open channels, pipes, and storm sewers. Values for Manning's roughness coefficient (n) shall be consistent with Table F-4 in Appendix F.
H. 
Outlet structures for stormwater management facilities shall be designed to meet the performance standards of this article using any generally accepted hydraulic analysis technique or method.
I. 
The design of any stormwater detention facilities intended to meet the performance standards of this article shall be verified by routing the design storm hydrograph through these facilities using the storage-indication method. The design storm hydrograph shall be computed using a calculation method that produces a full hydrograph. Haverford Township may approve the use of any generally accepted full hydrograph approximation technique that shall use a total runoff volume that is consistent with the volume from a method that produces a full hydrograph.
A. 
Any stormwater facility located on state highway rights-of-way shall be subject to approval by PennDOT.
B. 
All wet basin designs shall incorporate biologic controls consistent with the West Nile Guidance found in Appendix H.[1]
[1]
Editor's Note: Appendix H is included at the end of this chapter.
C. 
Any stormwater management facility (i.e., detention basin) required or regulated by this article designed to store runoff and requiring a berm or earthen embankment shall be designed to provide an emergency spillway to handle flow up to and including the one-hundred-year proposed conditions. The height of embankment must provide a minimum 1.0 foot of freeboard above the maximum pool elevation computed when the facility functions for the one-hundred-year proposed conditions inflow. Should any stormwater management facility require a dam safety permit under DEP Chapter 105, the facility shall be designed in accordance with Chapter 105 and meet the regulations of Chapter 105 concerning dam safety. Chapter 105 may be required to pass storms larger than the one-hundred-year event.
D. 
Any facilities that constitute water obstructions (e.g., culverts, bridges, outfalls, or stream enclosures) and any work involving wetlands governed by DEP Chapter 105 regulations (as amended or replaced from time to time by DEP) shall be designed in accordance with Chapter 105 and will require a permit from DEP.
E. 
Any other drainage conveyance facility that does not fall under Chapter 105 regulations must be able to convey, without damage to the drainage structure or roadway, runoff from the twenty-five-year design storm with a minimum 1.0 foot of freeboard measured below the lowest point along the top of the roadway. Any facility that constitutes a dam as defined in DEP Chapter 105 regulations may require a permit under dam safety regulations. Any facility located within a PennDOT right-of-way must meet PennDOT minimum design standards and permit submission requirements.
F. 
Any drainage conveyance facility and/or channel not governed by Chapter 105 regulations must be able to convey, without damage to the drainage structure or roadway, runoff from the twenty-five-year design storm. Conveyance facilities to or exiting from stormwater management facilities (i.e., detention basins) shall be designed to convey the design flow to or from that structure. Roadway crossings located within designated floodplain areas must be able to convey runoff from a one-hundred-year design storm. Any facility located within a PennDOT right-of-way must meet PennDOT minimum design standards and permit submission requirements.
G. 
Adequate erosion protection shall be provided along all open channels and at all points of discharge.
H. 
The design of all stormwater management facilities shall incorporate sound engineering principles and practices. Haverford Township reserves the right to disapprove any design that would result in construction in or continuation of a stormwater problem area.
A. 
The municipal Engineer or his municipal designee shall inspect all phases of the installation of the permanent BMPs and/or stormwater management facilities as deemed appropriate by the municipal Engineer.
B. 
During any stage of the work, if the municipal Engineer or his municipal designee determines that the permanent BMPs and/or stormwater management facilities are not being installed in accordance with the approved stormwater management plan, the municipality shall revoke any existing permits or other approvals and issue a cease and desist order until a revised drainage plan is submitted and approved, as specified in this article, and until the deficiencies are corrected.
C. 
A final inspection of all BMPs and/or stormwater management facilities shall be conducted by the municipal Engineer or his municipal designee to confirm compliance with the approved drainage plan prior to the issuance of any occupancy permit.
Fees shall be established by Haverford Township to defray plan review and construction inspection costs incurred by the municipality. All fees shall be paid by the applicant at the time of drainage plan submission. A review and inspection fee schedule shall be established by resolution of the Board of Commissioners based on the size of the regulated activity and based on the municipality's costs for reviewing drainage plans and conducting inspections pursuant to § 78-40. Haverford Township shall periodically update the review and inspection fee schedule to ensure that review costs are adequately reimbursed.
A. 
The fees required by this article shall at a minimum cover:
(1) 
Administrative costs.
(2) 
The site inspections.
(3) 
Any additional work required to enforce any permit provisions regulated by this article, correct violations, and assure proper completion of stipulated remedial actions.
B. 
In addition, any and all costs for the review of plans and the inspection of stormwater management facilities and drainage improvements during construction by the municipal engineer, shall be deducted from the applicant's escrow account.
A. 
For subdivisions and land developments the applicant shall provide a financial guarantee to the municipality for the timely installation and proper construction of all stormwater management controls as:
(1) 
Required by the approved drainage plan equal to or greater than the full construction cost of the required controls; or
(2) 
The amount and method of payment provided for in the SALDO.[1]
[1]
Editor's Note: See Ch. 160, Subdivision and Land Development.
B. 
For other regulated activities, Haverford Township may require a financial guarantee from the applicant.
A. 
No regulated earth disturbance activities within Haverford Township shall commence until approval by the municipality of a stormwater control and BMP operations and maintenance plan that describes how the permanent (e.g., postconstruction) stormwater controls and BMPs will be properly operated and maintained.
B. 
The following items shall be included in the stormwater control and BMP operations and maintenance plan:
(1) 
Map(s) of the project area, in a form that meets the requirements for recording at the offices of the Recorder of Deeds of Delaware County. The contents of the maps(s) shall include, but not be limited to:
(a) 
Clear identification of the location and nature of permanent stormwater controls and BMPs;
(b) 
The location of the project site relative to highways, municipal boundaries, or other identifiable landmarks;
(c) 
Existing and final contours at intervals of two feet, or others as appropriate;
(d) 
Existing streams, lakes, ponds, or other bodies of water within the project site area;
(e) 
Other physical features, including flood hazard boundaries, sinkholes, streams, existing drainage courses, and areas of natural vegetation to be preserved;
(f) 
The locations of all existing and proposed utilities, sanitary sewers, and waterlines within 50 feet of property lines of the project site;
(g) 
Proposed final changes to the land surface and vegetative cover, including the type and amount of impervious area that would be added;
(h) 
Proposed final structures, roads, paved areas, and buildings; and
(i) 
A fifteen-foot-wide access easement around all stormwater controls and BMPs that would provide ingress to and egress from a public right-of-way.
(2) 
A description of how each permanent stormwater control and BMP will be operated and maintained, and the identity and contact information associated with the person(s) responsible for operations and maintenance.
(3) 
The name of the project site, the name and address of the owner of the property, and the name of the individual or firm preparing the plan.
(4) 
A statement, signed by the landowner, acknowledging that the stormwater controls and BMPs are fixtures that can be altered or removed only after approval by Haverford Township.
C. 
The stormwater control and BMP operations and maintenance plan for the project site shall establish responsibilities for the continuing operation and maintenance of all permanent stormwater controls and BMPs, as follows:
(1) 
If a plan includes structures or lots which are to be separately owned and in which streets, sewers, and other public improvements are to be dedicated to Haverford Township, stormwater controls and BMPs may also be dedicated to and maintained by the municipality;
(2) 
If a plan includes operations and maintenance by a single ownership or if sewers and other public improvements are to be privately owned and maintained, then the operation and maintenance of stormwater controls and BMPs shall be the responsibility of the owner or private management entity.
D. 
Haverford Township shall make the final determination on the continuing operations and maintenance responsibilities. The municipality reserves the right to accept or reject the operations and maintenance responsibility for any or all of the stormwater controls and BMPs.
A. 
The municipality shall review the stormwater control and BMP operations and maintenance plan for consistency with the purposes and requirements of this article and any permits issued by DEP.
B. 
The municipality shall notify the applicant in writing whether or not the stormwater control and BMP operations and maintenance plan is approved.
C. 
The municipality may require a "record drawing" of all stormwater controls and BMPs and an explanation of any discrepancies with the operations and maintenance plan.
It shall be unlawful to alter or remove any permanent stormwater control and BMP required by an approved stormwater control and BMP operations and maintenance plan or to allow the property to remain in a condition which does not conform to an approved stormwater control and BMP operations and maintenance plan.
A. 
The applicant shall sign an operations and maintenance agreement with Haverford Township covering all stormwater controls and BMPs that are to be privately owned. The maintenance agreement shall be transferred with transfer of ownership. The agreement shall be substantially the same as the agreement in Appendix I of this article.[1]
[1]
Editor's Note: Appendix I, the Operation and Maintenance Agreement for BMPs, is included at the end of this chapter.
B. 
Other items may be included in the agreement where determined necessary to guarantee the satisfactory operation and maintenance of all permanent stormwater controls and BMPs. The agreement shall be subject to the review and approval of Haverford Township.
A. 
Stormwater management easements are required for all areas used for off-site stormwater control, unless a waiver is granted by the municipal Engineer.
B. 
Stormwater management easements shall be provided by the applicant or property owner if necessary for access for inspections and maintenance or the preservation of stormwater runoff conveyance, infiltration, and detention areas and other stormwater controls and BMPs by persons other than the property owner. The purpose of the easement shall be specified in any agreement under § 78-47.
A. 
Prior to final approval of the site's drainage plan, the applicant shall sign and record the maintenance agreement contained in Appendix I,[1] which is attached and made part hereof, covering all stormwater control facilities that are to be privately owned.
[1]
Editor's Note: Appendix I, the Operation and Maintenance Agreement for BMPs, is included at the end of this chapter.
B. 
Other items may be included in the agreement where determined necessary to guarantee the satisfactory maintenance of all facilities. The maintenance agreement shall be subject to the review and approval of the municipal Solicitor and Board of Commissioners.
A. 
The owner of any land upon which permanent stormwater controls and BMPs will be placed, constructed, or implemented, as described in the stormwater control and BMP operations and maintenance plan, shall record the following documents in the Office of the Recorder of Deeds for Delaware County within 15 days of approval of the stormwater control and BMP operations and maintenance plan by the municipality:
(1) 
The operations and maintenance plan, or a summary thereof,
(2) 
Operations and maintenance agreements under § 78-47; and
(3) 
Easements under § 78-48.
B. 
The municipality may suspend or revoke any approvals granted for the project site upon discovery of failure on the part of the owner to comply with this section.
A. 
Persons installing stormwater controls or BMPs shall be required to pay a specified amount to the Municipal Stormwater Control and BMP Operation and Maintenance Fund to help defray costs of periodic inspections and maintenance expenses. The amount of the deposit shall be determined as follows:
(1) 
If the stormwater control or BMP is to be privately owned and maintained, the deposit shall cover the cost of periodic inspections performed by Haverford Township for a period of 10 years, as estimated by the municipal Engineer. After that period of time, inspections will be performed at the expense of the municipality.
(2) 
If the stormwater control or BMP is to be owned and maintained by Haverford Township, the deposit shall cover the estimated costs for maintenance and inspections for 10 years. The municipal Engineer will establish the estimated costs utilizing information submitted by the applicant.
(3) 
The amount of the deposit to the fund shall be converted to present worth of the annual series values. The municipal Engineer shall determine the present worth equivalents, which shall be subject to the approval of the governing body.
B. 
If a stormwater control or BMP is proposed that also serves as a recreational facility (e.g., ball field or lake), Haverford Township may reduce or waive the amount of the maintenance fund deposit based upon the value of the land for public recreational purpose.
C. 
If at some future time a stormwater control or BMP (whether publicly or privately owned) is eliminated due to the installation of storm sewers or other storage facility, the unused portion of the maintenance fund deposit will be applied to the cost of abandoning the facility and connecting to the storm sewer system or other facility. Any amount of the deposit remaining after the costs of abandonment are paid will be returned to the depositor.
D. 
If stormwater controls or BMPs are accepted by Haverford Township for dedication, the municipality may require persons installing stormwater controls or BMPs to pay a specified amount to the Municipal Stormwater Control and BMP Operation and Maintenance Fund to help defray costs of operations and maintenance activities. The amount may be determined as follows:
(1) 
The amount shall cover the estimated costs for operations and maintenance for 10 years, as determined by Haverford Township.
(2) 
The amount shall then be converted to present worth of the annual series values.
E. 
If a stormwater control or BMP is proposed that also serves as a recreational facility (e.g., ball field or lake), Haverford Township may adjust the amount due accordingly.
F. 
Haverford Township shall require applicants to pay a fee to the Municipal Stormwater Control and BMP Operation and Maintenance Fund to cover long-term maintenance of stormwater controls and BMPs.
G. 
Haverford Township may require applicants to pay a fee to the Municipal Stormwater Control and BMP Operation and Maintenance Fund to cover stormwater-related problems which may arise from the land development and earth disturbance.
A. 
No person in Haverford Township shall allow, or cause to allow, stormwater discharges into the municipality's separate storm sewer system which are not composed entirely of stormwater, except 1) as provided in Subsection B below; and 2) discharges allowed under a state or federal permit.
B. 
Discharges that may be allowed based on a finding by the municipality that the discharge(s) do not significantly contribute to pollution to surface waters of the commonwealth, are:
(1) 
Discharges from fire-fighting activities.
(2) 
Potable water sources including dechlorinated waterline and fire hydrant flushings.
(3) 
Irrigation drainage.
(4) 
Routine external building washdown (which does not use detergents or other compounds).
(5) 
Air conditioning condensate.
(6) 
Water from individual residential car washing.
(7) 
Spring water from crawl space pumps.
(8) 
Uncontaminated water from foundation or from footing drains.
(9) 
Flows from riparian habitats and wetlands.
(10) 
Lawn watering.
(11) 
Pavement washwaters where spills or leaks of toxic or hazardous materials have not occurred (unless all spill material has been removed) and where detergents are not used.
(12) 
Dechlorinated swimming pool discharges.
(13) 
Uncontaminated groundwater.
C. 
In the event that the municipality determines that any of the discharges identified in Subsection B significantly contribute to pollution of waters of the commonwealth, or is so notified by DEP, Haverford Township will notify the responsible person to cease the discharge.
D. 
Upon notice provided by the municipality under Subsection C, the discharger will have a reasonable time, as determined by Haverford Township, to cease the discharge consistent with the degree of pollution caused by the discharge.
E. 
Nothing in this section shall affect a discharger's responsibilities under state law.
[1]
Editor's Note: The following language taken from DEP's NPDES program and model NPDES ordinance is required to be incorporated into this article.
The following connections are prohibited, except as provided in § 78-52B above:
A. 
Any drain or conveyance, whether on the surface or subsurface, which allows any non-stormwater discharge including sewage, process wastewater, and wash water, to enter the separate storm sewer system, and any connections to the storm drain system from indoor drains and sinks; and
B. 
Any drain or conveyance connected from a commercial or industrial land use to the separate storm sewer system which has not been documented in plans, maps, or equivalent records and approved by Haverford Township.
A. 
Roof drains shall not be connected to streets, sanitary or storm sewers, or roadside ditches in order to promote overland flow and infiltration/percolation of stormwater where advantageous to do so.
B. 
When it is more advantageous to connect directly to streets or storm sewers, connections of roof drains to streets or roadside ditches may be permitted on a case-by-case basis as determined by Haverford Township.
C. 
Roof drains shall discharge to infiltration areas or vegetative BMPs to the maximum extent practicable.
A. 
No person shall modify, remove, fill, landscape, or alter any existing stormwater control or BMP unless it is part of an approved maintenance program without the written approval of the municipality.
B. 
No person shall place any structure, fill, landscaping, or vegetation into a stormwater control or BMP or within a drainage easement which would limit or alter the functioning of the stormwater control or BMP without the written approval of Haverford Township.
A. 
Upon presentation of proper credentials, duly authorized representatives of the municipality may enter at reasonable times upon any property within Haverford Township to inspect the implementation, condition, or operation and maintenance of the stormwater controls or BMPs in regard to any aspect governed by this article.
B. 
Stormwater control and BMP owners and operators shall allow persons working on behalf of Haverford Township ready access to all parts of the premises for the purposes of determining compliance with this article.
C. 
Persons working on behalf of Haverford Township shall have the right to temporarily locate on any stormwater control or BMP in the municipality such devices as are necessary to conduct monitoring and/or sampling of the discharges from such stormwater control or BMP.
D. 
Unreasonable delays in allowing the municipality access to a stormwater control or BMP is a violation of this article.
A. 
The violation of any provision of this article is hereby deemed a public nuisance.
B. 
Each day that a violation continues shall constitute a separate violation.
A. 
Whenever Haverford Township finds that a person has violated a prohibition or failed to meet a requirement of this article, the municipality may order compliance by written notice to the responsible person. Such notice may, without limitation, require the following remedies:
(1) 
Performance of monitoring, analyses, and reporting;
(2) 
Elimination of prohibited connections or discharges;
(3) 
Cessation of any violating discharges, practices, or operations;
(4) 
Abatement or remediation of stormwater pollution or contamination hazards and the restoration of any affected property;
(5) 
Payment of a fine to cover administrative and remediation costs;
(6) 
Implementation of stormwater controls and BMPs; and
(7) 
Operation and maintenance of stormwater controls and BMPs.
B. 
Such notification shall set forth the nature of the violation(s) and establish a time limit for correction of these violations(s). Said notice may further advise that, if applicable, should the violator fail to take the required action within the established deadline, the work will be done by Haverford Township or designee, and the expense thereof shall be charged to the violator.
C. 
Failure to comply within the time specified shall also subject such person to the penalty provisions of this article. All such penalties shall be deemed cumulative and shall not prevent the municipality from pursuing any and all other remedies available in law or equity.
A. 
Any building, land development, or other permit or approval issued by Haverford Township may be suspended or revoked by the municipality for:
(1) 
Noncompliance with or failure to implement any provision of the permit;
(2) 
A violation of any provision of this article; or
(3) 
The creation of any condition or the commission of any act during construction or development which constitutes or creates a hazard or nuisance, pollution, or which endangers the life, health, or property of others.
B. 
A suspended permit or approval shall be reinstated by the municipality when:
(1) 
The Township Engineer or designee has inspected and approved the corrections to the stormwater controls and BMPs or the elimination of the hazard or nuisance; and/or
(2) 
The Township is satisfied that the violation of the article, law, or rule and regulation has been corrected.
C. 
A permit or approval that has been revoked by the Township cannot be reinstated. The applicant may apply for a new permit under the procedures outlined in this article.
A. 
Any person violating the provisions of this article shall be guilty of a misdemeanor and upon conviction shall be subject to a fine of not more than $1,000 for each violation, recoverable with costs, or imprisonment of not more than 90 days, or both. Each day that the violation continues shall be a separate offense.
[Amended 3-12-2012 by Ord. No. 2660]
B. 
In addition, the Township, through its Solicitor, may institute injunctive, mandamus, or any other appropriate action or proceeding at law or in equity for the enforcement of this article. Any court of competent jurisdiction shall have the right to issue restraining orders, temporary or permanent injunctions, mandamus, or other appropriate forms of remedy or relief.
In the event that a person fails to comply with the requirements of this article or fails to conform to the requirements of any permit issued hereunder, the Township shall provide written notification of the violation. Such notification shall state the nature of the violation(s) and establish a time limit for correction of these violation(s). Failure to comply within the time specified shall subject such person to the penalty provisions of this article. All such penalties shall be deemed cumulative and shall not prevent the Township from pursuing any and all remedies. It shall be the responsibility of the owner of the real property on which any regulated activity is proposed to occur, is occurring, or has occurred to comply with the terms and conditions of this article.
The Board of Commissioners is hereby authorized and directed to enforce all of the provisions of this article. All inspections regarding compliance with the drainage plan shall be the responsibility of the Township Engineer or other qualified persons designated by the Board of Commissioners.
A. 
A set of design plans approved by the Township shall be on file at the site throughout the duration of the construction activity. Periodic inspections may be made by the Township or designee during construction.
B. 
It shall be unlawful for any person, firm, or corporation to undertake any regulated activity under § 78-16 on any property except as provided for in the approved drainage plan and pursuant to the requirements of this article. It shall be unlawful to alter or remove any control structure required by the drainage plan pursuant to this article or to allow the property to remain in a condition which does not conform to the approved drainage plan.
C. 
At the completion of the project and as a prerequisite for the release of the performance guarantee, the owner or his representatives shall:
(1) 
Provide a certification of completion from an engineer, architect, surveyor or other qualified person verifying that all permanent facilities have been constructed according to the plans and specifications and approved revisions thereto.
(2) 
Provide a set of as-built (record) drawings.
D. 
After receipt of the certification by Haverford Township, a final inspection shall be conducted by the municipal Engineer or designated representative to certify compliance with this article.
E. 
Prior to revocation or suspension of a permit and at the request of the applicant, the governing body will schedule a hearing to discuss the noncompliance if there is no immediate danger to life, public health, or property. The expense of a hearing shall be the applicant's responsibility.
F. 
Occupancy permit. An occupancy permit shall not be issued unless the certification of completion pursuant to § 78-62C(1) has been secured. The occupancy permit shall be required for each lot owner and/or applicant for all subdivisions and land developments in Haverford Township.
A. 
Any person aggrieved by any action of the municipality or its designee may appeal to the Board of Commissioners of Haverford Township within 30 days of that action.
B. 
Any person aggrieved by any decision of the Board of Commissioners of Haverford Township may appeal to the County Court of Common Pleas in the County where the activity has taken place within 30 days of the municipal decision.