(A) For design and applicability of non-structural BMPs, refer to the BMP Manual Chapter 5. For the non-structural BMPs proposed, the applicant shall utilize and submit appropriate checklists included in the BMP Manual Chapter 8, § 8.8, to demonstrate that the BMPs are applicable to the project and to determine the amount of volume or peak rate credit is applicable.
(B) An applicant for major subdivision or land development approval shall demonstrate that stormwater management is designed in the following sequence to minimize the increase in stormwater runoff and degradation of water quality:
(1) Prepare an existing resource and site analysis plan (ERSAP), showing environmentally sensitive areas including, but not limited to, steep slopes, ponds, lakes, streams, wetlands, hydric soils, vernal pools, floodplains, riparian corridors, hydrologic soil groups A, B, C and D, “prime agricultural soils” (prime farmland and farmland of statewide importance as designated in the soil survey of Bucks County), woodlands, surface waters regulated by the commonwealth or federal government, any existing recharge areas and any other requirements outlined in the subdivision and land development ordinance. The plan shall also show and establish riparian buffers according to § 151.028;
(2) Prepare a draft project layout avoiding sensitive areas identified in the ERSAP and minimizing earth disturbance for the site. The ratio of disturbed area to the entire site area and measures taken to minimize earth disturbance shall be included in the ERSAP;
(3) Identify site specific existing conditions, drainage areas, discharge points (points of interest), recharge areas and hydrologic soil groups A and B;
(4) Evaluate nonstructural stormwater management alternatives (refer to Appendix G of this chapter):
(a) Minimize earth disturbance;
(b) Minimize impervious surfaces; and
(c) Break up large impervious surfaces.
(5) Satisfy volume control objective (further described in § 151.027);
(6) Satisfy recharge requirements (further described in § 151.030);
(7) Satisfy stream bank erosion protection objective (further described in § 151.031);
(8) Determine the stormwater management (release rate) district within which the project site is located (refer to Appendix C of this chapter) and conduct a predevelopment runoff analysis;
(9) Prepare final project design to maintain predevelopment drainage areas and discharge points, to minimize earth disturbance and impervious surfaces, to reduce runoff to the maximum extent possible and to minimize the use of surface or point discharges;
(10) Conduct a proposed conditions runoff analysis based on the final design and to meet the release rate;
(11) Manage any remaining runoff through treatment prior to discharge, as part of detention, bioretention, direct discharge or other structural control; and
(12) Prepare an operation and maintenance plan consistent with requirements of § 151.106 that ensures the long-term viability of the stormwater control facilities.
(Ord. 239, passed 10-14-2020)