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West Seneca Exchange - Orchard Park Rd, Slade Ave, Ridge Rd Town of West Seneca, Erie County, New York WATER QUALITY REQUIRED FOR PROPOSED DEVELOPMENT AREA Area, Acres = 53 (Note: Reference Chap. 9 NYSDEC Stormwater Design Manual) "Redevelopment Activity", Acres = 47.75 "New development", Acres = 5.25 (existing, disturbed impervious area) Total proposed impervious, Acres = 47.00 Adjusted impervious, Acres = 11.19 "New" impervious, Acres = -0.75 (25% redevelopment, 100% new development) Water Quality Volume (WQv) WQv=(P*Rv*A)/12 Where: P=90% Rainfall Event Number P= 1 Rv= 0.05+0.009*(I) Rv= 0.24 IC=Impervious Cover, Acres IC= 11.19 I=Impervious Cover (%) I= 21 A=Runoff Area, Acres A= 53 WQv (ac-ft)= 1.060 WQv (cf)= 46,174 RRv PROVIDED FOR PROPOSED DEVELOPMENT AREA (See NYSDEC worksheets) WQv, cf RRv, cf Min. RRv Req'd, cf = 0 RRv, none required 0 0 Min. RRv Req'd, ac-ft = 0.000 WQv, Wet Pond 46,174 0 TOTAL, cf 46174 0 TOTAL, ac-ft 1.060 0.000 WQ & RR SUMMARY (ac-ft): TOTAL WATER QUALITY PROVIDED FOR PROPOSED DEVELOPMENT AREA 1.060 IS WATER QUALITY VOLUME REQUIREMENT MET? Yes (WQv provided equal to or greater than WQv required) IS RUNOFF REDUCTION VOLUME REQUIREMENT MET? Yes (RRv provided equal to or greater than Min. RRv required) Page 816 of 1174