A. Design and Performance Standards for Stormwater Management Measures.

1. Stormwater management measures for major development shall be developed to meet the erosion control, groundwater recharge, stormwater runoff quantity, and stormwater runoff quality standards in 13-8.403. To the maximum extent practicable, these standards shall be met by incorporating nonstructural stormwater management strategies into the design. If these strategies alone are not sufficient to meet these standards, structural stormwater management measures necessary to meet these standards shall be incorporated into the design.

Stormwater management measures for minor development projects shall meet erosion control, groundwater recharge and runoff quantity standards as defined in 13-8.403. Minor Developments are encouraged to meet these standards and the runoff quality standards by incorporating nonstructural stormwater management strategies into the design. If these strategies are not sufficient to meet these standards, structural stormwater management measures necessary to meet these standards shall be incorporated into the design.

2. The standards in this ordinance apply to new major and minor development projects and are intended to minimize the impact of stormwater runoff on water quality and water quantity in receiving water bodies and maintain groundwater recharge. The standards do not apply to new major development to the extent that alternative design and performance standards are applicable under a regional stormwater management plan or Water Quality Management Plan adopted in accordance with Department rules provided that any alternative standards provide at least as much protection from stormwater-related loss of groundwater recharge, stormwater quantity and water quality impacts of major development projects as would be provided under the standards in N.J.A.C. 7:8-5.

3. Design Standards shall be in accordance with the Residential Site Improvement Standards, N.J.A.C. 5:21-7, Stormwater Management, the NJ Department of Environmental Protection (NJDEP) Flood Hazard Area Control, Stormwater Management Regulations, N.J.A.C. 7:13-2.8 and New Jersey Stormwater Best Management Practices Manual, which standards are hereby adopted by reference and made part of these regulations. A copy of said standards, including all amendments; revisions and supplements thereto shall be kept on file in the files of the Township Engineer and Township Clerk.

4. The rate and velocity of runoff from the site following completion of the developed portion of the site shall be reduced, in accordance with the regulations referenced in paragraphs 1 and 2 above, from that which would occur prior to land disturbance and/or construction activities. Runoff coefficients shall be determined in accordance with the regulations referenced in paragraphs 1 and 2 above,

5. Maximum use shall be made of presently existing surface water runoff control devices, mechanisms or areas such as existing berms, terraces, grass waterways, favorable hydrologic soils, swamps, swales, watercourses, woodlands, floodplains, as well as any proposed detention and/or retention structures.

6. Wherever permitted by the zoning regulations, cluster development should be encouraged if it will reduce the total area of impervious surfaces and preserve the open space and topographic features critical to stormwater management.

7. Evaluation shall be made of the nature of the subwatershed(s) of which the site is part, the receiving stream channel capacities and point of concentration and effects on downstream structures.

8. Generally, surface water runoff shall not be transferred from one watershed to another.

9. The plan shall coordinate with the soil erosion/sediment control plan and, where applicable, to other environmental ordinances in force.

10. Reestablishing vegetative cover shall be in accordance with "Standards and Specifications for Soil Erosion and Sediment Control in New Jersey" (latest edition).

11. Prior to construction or other land disturbance, the developer's Site Development Stormwater Management Plan (SDSMP) shall establish permanent surface water management measures, such as seeding or establishing sod in grass waterways.

12. Calculations for stormwater quantity shall be submitted for 1, 2, 10, 25, 50 and 100year storm frequencies. Runoff rate control must be achieved for storms up to and including 24-hour events.

13. A single residential lot created by subdivision that has a total land disturbance of less than 1 acre and proposed impervious coverage less than '/ acre may, in lieu of the requirements of this section, utilize the following methodology for providing stormwater quantity reduction: provide drywell storage for a volume equal to the roof area of proposed dwelling multiplied by 2.5 inches. The design shall consider soil suitability, topography and vegetation. Construction details shall be approved by the Township Engineer.

14. Floor drains in commercial establishments, where proposed, shall be provided with adequate water quality control upstream of connections to storm sewers that drain into wetlands, surface or ground waters. Untreated floor drains shall not be permitted to flow from garden centers or any area where hazardous materials are stored.