2918-25 STORMWATER 4.8.25-Revised - Final.pdf

34 Table 7 Minor Development BMP Grass Swale Green Roof Pervious Paving System Small-Scale Bioretention Basin Small-Scale Infiltration Basin Small-Scale Sand Filter Vegetative Filter Strip Cistern Dry Well* (* The use of dry wells is allowed only where the other listed methods cannot feasibly meet the requirements of this section.) 6) Table 8 Provides presumptive rain garden sizes that can be installed to manage New Jersey’s Water Quality Design Storm on minor developments. Table 8 Rain Garden Table Drainage Area Rain Garden Size Clay Soil (soil amendments needed) Silty Soil Sandy Soil 500 ft2 200 ft2 100 ft2 75 ft2 750 ft2 350 ft2 150 ft2 112 ft2 1,000 ft2 400 ft2 200 ft2 149 ft2 1,500 ft2 600 ft2 300 ft2 224 ft2 2,000 ft2 800 ft2 400 ft2 299 ft2 (Source: Rain Garden Manual of New Jersey, Rutgers Water Resource Programs. Rain garden size based on New Jersey’s Water Quality Design Storm – 1.25 inches of rain over 2 hours) 7) The stormwater management feature shall be protected from future development by conservation easement, deed restriction, or other acceptable measures. 8) Waivers. A waiver from strict compliance with § 25-29.9 may be granted by the Township Engineer for those projects where an applicant has demonstrated the inability or impracticability of strictest compliance with the stormwater management requirements in that section. No waiver shall be granted if the runoff compliance is less than the 10-year rainfall event. 9) The use of a BMP is subject to soil suitability and approval of the Township Engineer.