For any of the regulated activities of this chapter, prior to the final approval of subdivision and/or land development plans, or the issuance of any permit, or the commencement of any regulated earth-disturbance activity, the owner, subdivider, developer or his agent shall submit a drainage plan and receive municipal approval of the plan.
Exemptions from the drainage plan requirements are as specified in § 415-6.
The following items shall be included in and/or on the drainage plan:
A map(s) prepared in a clear, concise, legible, neat and well-organized manner that shall be:
Submitted on twenty-four-inch-by-thirty-six-inch sheets and shall be prepared in a form that meets the requirements for recording at the offices of the Recorder of Deeds of Montgomery County; and
At a scale of one inch equals no more than 50 feet except that a scale of one inch equals 100 feet may be used for tracts of 20 acres or more.
Signed and sealed by a qualified design professional.
A report including a general narrative description of the project and proposed stormwater controls and calculations signed and sealed by a qualified design professional; and
Supplemental information as necessary.
Map(s) of the project area showing the:
Name and address of the project site, the name and address of the owner of the property and the name of the individual or firm preparing the drainage plan;
Written and graphic scale;
Tract boundary described to the nearest foot and degree;
Existing and proposed land use(s);
Location map showing the project relative to highways, municipalities or other identifiable landmarks preferably at a scale of one inch equal to 1,000 feet;
Existing contours at intervals of two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used;
Off-site drainage areas/boundaries impacting the project including topographic detail;
Streams, lakes, ponds or other bodies of water within the project area;
Locations of all existing and proposed utilities (whether aboveground or underground), sanitary sewers and water lines within 50 feet of property lines of the project site;
Locations of on-lot sewage disposal systems;
Location of all public water supply wells within 400 feet of the project and all private water supply wells within 100 feet of the project;
Soil types and boundaries based on the county soil survey, as applicable, latest edition. Any hydric soils present on the site should be identified as such;
Geologic types, boundaries and any special geologic features present on the site;
Proposed changes to land surface and vegetative cover;
Proposed structures, roads, paved areas and buildings;
Final contours at intervals of two feet. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used;
Stormwater management district boundaries applicable to the site;
Clear identification of the location and nature of all stormwater management controls and BMPs including:
Adequate access easement (a minimum of 20 feet) around all stormwater BMPs that would provide municipal ingress to and egress from a public right-of-way;
Limits of earth disturbance, including the type and amount of impervious area that would be added;
A note referencing the associated calculations and, if separate, the erosion and sediment control plan by title and date;
A note indicating the ownership and maintenance responsibilities for each proposed stormwater management facility;
A statement, signed by the landowner, acknowledging that any revision to the approved drainage plan must be approved by the Township and, if applicable, the Conservation District;
A statement, signed by the design engineer as follows:
Construction details including cross sections where appropriate of the proposed stormwater management facilities;
When requested by the Township Engineer, construction specifications of the materials to be used for stormwater management facilities; and
When requested by the Township Engineer, profiles of proposed stormwater facilities or other proposed improvements.
A narrative report including:
The overall stormwater management concept for the project;
A schematic showing all tributaries contributing flow to the site and all existing man-made features beyond the property boundary that would be affected by the project;
All calculations, assumptions and criteria used in the design of the BMPs shall be provided;
All site testing data used to determine the feasibility of infiltration on a site; and
The effect of the project, in terms of runoff volumes and peak flows, on adjacent properties and on any existing Township stormwater collection system that may receive runoff from the project site.
Supplemental information including:
For regulated earth-disturbance activities, a BMP operations and maintenance plan prepared in accordance with § 415-24A(1) above, including:
A description of how each permanent stormwater BMP will be operated and maintained and the identity of the person(s) responsible for operations and maintenance;
A statement, signed by the landowner, acknowledging that the stormwater BMPs are fixtures that cannot be altered or removed without approval by the municipality;
The name of the project, the name and address of the owner of the property, and the name of the individual or firm preparing the plan.
An erosion control plan if separate from the drainage plan maps set.
Any additional information deemed necessary by the Township in order to determine compliance with the provisions of this chapter.
For activities that require an NPDES Permit for Stormwater Discharges from Construction Activities, a PaDEP Joint Permit Application, a PennDOT Highway Occupancy Permit, or any other permit under applicable state or federal regulations or are regulated under Chapter 105 (Dam Safety and Waterway Management) or Chapter 106 (Floodplain Management) of PaDEP's Rules and Regulations, proof of application for said permit(s) or approvals shall be part of the plan.
For regulated activities specified in § 415-5A and B (activities requiring Subdivision and Land Development Ordinance approval), the drainage plan shall be submitted by the developer to the Municipal Secretary (or other appropriate person) as part of the plan submission for the subdivision or land development. All submittal requirements shall be per the Upper Hanover Township Subdivision and Land Development Ordinance.
For regulated activities specified in § 415-5C through H, the drainage plan shall be submitted by the developer to the Municipal Building Permit Officer or Municipal Secretary as part of the building permit application, zoning permit application, or drainage plan review and approval process as may be applicable. The Municipal Building Permit Officer shall make a determination as to whether or not the proposal requires subdivision and land development ordinance approval. The following information must be submitted:
Three copies of the drainage plan map(s);
Two copies of the drainage plan narrative report; and
Three copies of the erosion control plan and two copies of any other required drainage plan supplemental information.
The municipality shall review the drainage plan, including the BMP operations and maintenance plan, for consistency with this chapter.
For regulated activities specified in § 415-5A and B (activities requiring Subdivision and Land Development Ordinance approval), the municipality shall notify the applicant in writing whether the drainage plan, including the BMP Operations and Maintenance Plan, is approved, consistent with time frames as established by the current Pennsylvania Municipalities Planning Code.
Editor's Note: See 53 P.S. § 10101 et seq.
For all other regulated activities (§ 415-5C through H), the municipality or its representative shall notify the applicant in writing whether or not the drainage plan, including the BMP operations and maintenance plan, is approved within 30 calendar days of the submittal of the complete drainage plan per § 415-25B.
Should the drainage plan be determined to be consistent with this chapter, the Township Engineer shall forward an approval letter to the applicant with a copy to the municipality and the Municipal Building Permit Officer.
Should the drainage plan be determined to be inconsistent with this chapter, the Township Engineer shall forward a disapproval letter to the applicant with a copy to the municipality and the Municipal Building Permit Officer.
The disapproval letter shall cite the reason(s) and specific sections of this chapter for the disapproval.
Disapproval may be due to inadequate information to make a reasonable judgment as to compliance with this chapter.
Any disapproved drainage plan may be revised by the applicant and resubmitted consistent with this article.
The Township may withhold approval of the drainage plan until the Township receives a copy of an approved highway occupancy permit from the PennDOT District Office and a NPDES Permit and/or any other applicable permits or approvals from PaDEP or the Conservation District. The above permits and approvals must be based on the approved drawings.
A modification to a drainage plan for a proposed development site which involves a change in control methods or techniques, or which involves the relocation or redesign of control measures, or which is necessary because soil or other conditions are not as stated on the drainage plan (as determined by the municipality) shall require a resubmission of the modified drainage plan consistent with § 415-25 subject to review per § 415-26 of this chapter.
The Board of Supervisors may hear requests for waivers where it is alleged that the provisions of this chapter inflict unnecessary hardship upon the applicant. The waiver request shall be in writing with a copy shall be provided to each of the following: municipality, Municipal Engineer, and Municipal Solicitor. The request shall fully document the nature of the alleged hardship.
The municipality may grant a waiver provided that all of the following finding are made in a given case:
That there are unique physical circumstances or conditions, including irregularity of lot size or shape, or exceptional topographical or other physical conditions peculiar to the particular property, and that the unnecessary hardship is due to such conditions, and not the circumstances or conditions generally created by the provisions of this chapter in the stormwater management district in which the property is located;
That because of such physical circumstances or conditions, there is no possibility that the property can be developed in strict conformity with the provisions of this chapter and that the authorization of a waiver is therefore necessary to enable the reasonable use of the property;
That such unnecessary hardship has not been created by the applicant;
That the waiver, if authorized, will represent the minimum waiver that will afford relief and will represent the least modification possible of the regulation in issue; and
That financial hardship is not the criteria for granting of a waiver.
In granting any waiver, the municipality may attach such conditions and safeguards as it may deem necessary to implement the purposes of this chapter. If a waiver is granted, the applicant must still manage the quantity, velocity, direction and quality of resulting storm runoff as is necessary to prevent injury to health, safety or other property.