[Ord. 2004-2, 4/5/2004]
1. 
General Requirements. From and after the date of enactment of this chapter, a stormwater management plan, and other information specified herein, shall be submitted to the municipality for all regulated activities. A stormwater management plan, and other information specified herein, shall be submitted at the same time, and together with submission of a preliminary and/or final subdivision or land development plan, along with a completed checklist supplied by the municipality indicating the items contained within the submission.
2. 
Concurrent Reviews. Such plans and information shall be considered part of said zoning and subdivision documents, and shall be reviewed in accordance with procedures established thereunder. Preliminary approval and/or final approval of a subdivision or land development plan, and/or the issuance of a zoning permit shall be contingent upon the submission of a stormwater management plan and other materials specified herein, and approval of the stormwater management plan in accordance with provisions of this chapter.
3. 
Review by Municipal Engineer. All stormwater management plans shall be submitted to the Municipal Engineer for review and comment. Such review shall include a statement by the Municipal Engineer specifying the provisions of this chapter which have not been met by the plan as submitted.
4. 
Validity of Approved Plan. Once a stormwater management plan has been approved, together with a subdivision or land development plan approval, or together with the issuance of a zoning permit, said stormwater management plan shall be valid only for the subdivision, land development, or zoning permit approved. Any further development on the lot or lots requiring a revision of the approved plan, or other construction or activities, as defined by municipal zoning regulations, shall require the submission of a new, amended, or revised stormwater management plan, and other information specified herein.
A. 
Exemptions From Plan Preparation. The following activities are specifically exempt from the plan preparation and submission provisions of this chapter, but remain subject to the design standards and criteria specified in Part 3 of this chapter (and erosion and sediment pollution control requirements).
(1) 
Noncommercial home gardening;
(2) 
Agriculture, when operated in accordance with an approved conservation plan, or erosion and sedimentation control plan;
(3) 
Forest management operations, conducted in accordance with the PA DEP's "Soil Erosion and Sedimentation Control Guidelines for Forestry," and an approved erosion and sediment pollution control plan;
(4) 
Regulated activities may be exempt from the plan preparation and submission provisions of this chapter if the total impervious area associated with such activities will be less than 2,500 square feet. The municipality and its Engineer shall review all regulated activities to determine if the activity or activities may be exempt from the plan preparation and submission provisions of this chapter. In addition to the criteria in this chapter subsection, the municipality and its Engineer may require that regulated activities maintain a minimum distance between proposed impervious areas/stormwater management facility outlets and downslope property line(s).
B. 
All regulated activities that do not fall under the exemption criteria referenced herein shall submit a drainage plan to the municipality for review. These criteria shall apply to the total proposed development, even if development is to take place in stages. Impervious cover shall include, but not be limited to, any roof, parking, or driveway areas; and any new streets and sidewalks. Any areas designed to initially be gravel or crushed stone shall be assumed to be impervious.
(1) 
Stormwater drainage systems shall be provided in order to permit unimpeded flow along natural watercourses, except as modified by stormwater management facilities or open channels consistent with this chapter.
(2) 
The existing points of concentrated drainage that discharge onto adjacent property shall not be altered without permission of the affected property owner(s), and shall be subject to any applicable discharge criteria specified in this chapter.
(3) 
Areas of existing diffused drainage discharge shall be subject to any applicable discharge criteria in the general direction of the existing discharge, whether proposed to be concentrated or maintained as diffused drainage areas, except as otherwise provided by this chapter. If diffused flow is proposed to be concentrated and discharged onto adjacent property, the applicant/developer must document that adequate downstream conveyance facilities exist to safely convey the concentrated discharge, or otherwise prove that no erosion, sedimentation, flooding, or other harm will result from the concentrated discharge.
(4) 
Where a site is traversed by watercourses, drainage easements shall be provided conforming to the line of such watercourses. The terms of the easement shall prohibit excavation, the placing of fill or structures, and any alterations that may adversely affect the flow of stormwater within any portion of the easement. Maintenance, including mowing of vegetation within the easement, shall be required, except as approved by the appropriate governing authority.
(5) 
When it can be shown that, due to topographic conditions, natural drainageways on the site cannot adequately provide for drainage, open channels may be constructed conforming substantially to the line and grade of such natural drainageways. Work within natural drainageways shall be subject to approval by PA DEP through the joint permit application process, or, where deemed appropriate by PA DEP, through a general permit or small projects permit.
(6) 
Any stormwater management facilities regulated by this chapter that would be located within or adjacent to wetlands or other waters of the commonwealth shall be subject to approval by PA DEP through the joint permit application process, or, where deemed appropriate by PA DEP, the general permit process. When there is a question whether wetlands may be involved, it is the responsibility of the applicant/developer, 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 PA DEP.
(7) 
Any stormwater management facilities regulated by this chapter that would be located on state highway rights-of-way shall be subject to approval by PA DOT.
(8) 
Minimization of impervious surfaces, and infiltration of stormwater runoff through stormwater infiltration facilities are encouraged where soil conditions permit in order to reduce the size, or eliminate the need for detention facilities.
(9) 
In order to promote overland flow and infiltration, roof drains should not discharge directly to streets or storm sewers. Roof drains may discharge directly to streets or storm sewers when deemed necessary by the municipality and its Engineer. Under no circumstances shall roof drains discharge directly to sanitary sewer systems.
[Ord. 2004-2, 4/5/2004]
1. 
The content of the plans shall consist of annotated maps, drawings, engineering plans, and construction details. Said plan shall be prepared by a registered landscape architect, professional engineer, or professional land surveyor, with said preparer's seal and registration number affixed to the plan. Plans for tracts of less than 20 acres shall be drawn at a scale of one inch equals no more than 50 feet; for tracts of 20 acres or more, plans shall be drawn at a scale of one inch equals no more than 100 feet. Plans shall be submitted on twenty-four-inch-by-thirty-six-inch sheets. All lettering shall be legible if the plans are reduced to half size. All sheets comprising a submission shall be on one size.
2. 
The following information, unless specifically exempted in writing, must be shown on the plans, and prepared in a form that meets the requirements for recording in the office of the Register and Recorder of Northumberland County, Pennsylvania:
A. 
The name of the proposed development and the name and address of the owner of the property and the individual or firm preparing the plan.
B. 
Date of submission and revision.
C. 
Graphic scale.
D. 
North point.
E. 
Total tract boundary with distances marked to the nearest foot, bearings to the nearest degree, and total acreage of the tract.
F. 
Key map showing all existing natural and man-made features beyond the property boundary affected by the project, and the extent of the watershed that drains through the project site.
G. 
Topographic contours at intervals not greater than five feet for existing and proposed conditions. Topographic contours at intervals less than five feet may be required for flat sites, and to depict certain existing and future stormwater management features. The reference datum used to develop topographic contours shall be either NGVD 1929 or NGVD 1988;
H. 
Drainage areas and subareas affecting the site, including areas necessary to determine downstream impacts analysis, where required, for proposed stormwater management facilities.
I. 
Existing and proposed use, including the total area of impervious surfaces after construction.
J. 
Existing soil types, karst formations, floodplain boundaries, sinkholes, undrained depressions, rock outcrops, streams, drainagecourses, wetlands based on existing sources and references, and vegetation.
K. 
Complete drainage systems for the site, including details for construction. All existing drainage features which are to be incorporated in the design shall be so identified. If the site is to be developed in stages, a general drainage plan for the entire site shall be presented with the first stage, and appropriate development stages for the drainage system shall be indicated.
L. 
Location and selected plant material used for vegetative filter paths to sinkholes, and the location of all notices to be posted.
M. 
If stormwater management facilities are off site, a note must be placed on the plan(s) referring to the location of the off-site facility or facilities. Said note must identify the entity or entities that will be responsible for the conveyance to, and maintenance of, the off-site facility or facilities. All such off-site facilities shall meet the design standards and criteria specified in Part 3 of this chapter, and details of the facilities shall be included with the plan.
N. 
Proposed easement locations, including drainage, maintenance, and access easements in conformance with Part 3, § 23-301, Subsection 1L, of this chapter.
O. 
The following statement by the landowner: "I/we hereby acknowledge that I/we and/or my/our assignees/grantees shall be responsible for maintenance of the stormwater management system shown hereon, in accordance with the approved stormwater management ownership and maintenance plan for this project, and that such stormwater system shall remain as a permanent fixture that cannot be altered, replaced, or removed without prior written approval from Watsontown Borough."
P. 
The location of the permanent watercourse that will receive stormwater runoff from the project site.
Q. 
Complete erosion and sediment pollution control facilities, including details for construction, in accordance with Part 3, § 23-303, of this chapter.
R. 
Horizontal location, and vertical profiles of all open channels including hydraulic capacity.
S. 
A note indicating that record (as-built) drawings will be submitted by the applicant's/developer's professional engineer or professional land surveyor for all stormwater facilities prior to occupancy, or the release of the surety bond. Watsontown Borough reserves the right to authorize the Municipal Engineer to review said record drawing.
T. 
The following stormwater management design certification signature block for the registered professional preparing the stormwater management plan:
"I,_________________________, hereby certify that the Stormwater Management Plan meets all design standards and criteria of the Watsontown Borough Stormwater Management Ordinance."
U. 
The following municipal stormwater management review signature block for the Municipal Engineer reviewing the stormwater management plan:
"I, _________________________, have reviewed this Stormwater Management Plan in accordance with the Design Standards and Criteria of the Watsontown Borough Stormwater Management Ordinance."
[Ord. 2004-2, 4/5/2004]
1. 
In addition to the plan information enumerated in § 23-202 of this Part, the following information shall be submitted:
A. 
A written description of:
(1) 
The overall project concept.
(2) 
Stormwater runoff computations as specified in Part 3, § 23-301, Subsections 1A, 1B and 1C, of this chapter, and in accordance with criteria contained in Appendix A of this chapter.[1]
[1]
Editor's Note: Said appendix is included as an attachment to this chapter.
(3) 
Horizontal and vertical profiles of any existing and proposed channels, culverts, drainageways, storm sewers, streams, or watercourses.
(4) 
Hydrologic and hydraulic computations for all existing and proposed stormwater management and conveyance facilities.
(5) 
Stormwater management both during and after development.
(6) 
Expected project time schedule.
B. 
The effect of the project on stormwater runoff volume, time to peak flow, and rate of flow on adjacent property, and upon an existing municipal stormwater drainage system when such will be utilized.
C. 
Description of all watercourses, impoundments, and wetlands on or adjacent to the site, or into which stormwater flows.
D. 
Soils investigation report, including boring logs, compaction requirements, and recommendations for construction of detention basins, when requested by the municipality or its Engineer.
E. 
Karst features identification and analysis reports, and a hydrogeologic assessment of the effects of stormwater runoff on sinkholes, as specified in Part 3, § 23-301, Subsection 1H(2), and § 23-302 of this chapter.
F. 
A soil erosion and sediment pollution control plan, including all reviews and approvals, as required, by PA DEP and/or Northumberland County Conservation District.
G. 
All easements, deed restrictions, covenants, and maintenance measures of the system shall be outlined in an Ownership and Maintenance Program in accordance with Part 3, § 23-304, of this chapter. For stormwater management systems to be dedicated to the municipality, a maintenance guarantee, as specified by the Pennsylvania Municipalities Planning Code,[2] may be required by Watsontown Borough. The municipality has the explicit right to reject any offer of dedication.
[2]
Editor's Note: See 53 P.S. § 10101 et seq.