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Suite Living Mounds View <br /> Civil Site Group-Stormwater Calculations <br /> Existing Conditions <br /> Drainage Area Impervious Area Pervious Area Total Area <br /> Area[SF] CN Value Area[SF] CN Value Area[SF] CN Value <br /> EX1(TO EX.WETLAND) 5979 98 147145 80 153124 81 <br /> EX2(TO LONG LAKE RD) 0 98 4047 80 4047 80 <br /> EX3(TO EAST) 0 98 302 80 302 80 <br /> (OFF-SITE TO EX.WETLAND) 42,086 98 13701 80 55787 94 <br /> Proposed Conditions <br /> Drainage Area Im ervious Area Pervious Area Total Area <br /> Area[SF] CN Value Area[SF] CN Value Area[SF] CN Value <br /> PR1A(TO EX.WETLAND) 0 98 73524 80 73524 80 <br /> PR1B(TO FIL BASIN 1) 22963 98 16438 80 39401 90 <br /> PR1C(TO FIL BASIN 2) 23783 98 14659 80 38442 91 <br /> PR2(TO LONG LAKE RD) 1396 98 4408 80 5804 84 <br /> PR3(TO EAST) 0 98 302 80 302 80 <br /> (OFF-SITE TO FIL.BASIN 2) 41270 98 14517 80 55787 93 <br /> Site Area Summary <br /> Impervious[SF] 1 Impervious[AC] 1 Pervious[SF] 1 Pervious[AC] Total[SF] Total[AC] <br /> Existing Site 1 48065 1 1.10 1 165195 1 3.79 1 213260 4.90 <br /> Proposed Site 1 89412 1 2.05 1 123848 1 2.84 1 213260 4.90 <br /> Stormwater Rate Summary <br /> Drainage Area Existing Rate cfs <br /> 2-YR[2.83"] 10-YR[4.23"] 1 100-YR[7.30"] <br /> EX1(TO EX.WETLAND) 6.36 12.48 26.86 <br /> EX2(TO LONG LAKE RD) 0.16 0.32 0.70 <br /> EX3(TO FAST) 0.01 0.02 0.05 <br /> EX4(OFF-SITE TO EX.WETLAND) 3.99 6.29 11.39 <br /> TOTAL(REACH) 10.51 19.11 39.01 <br /> Drainage Area Proposed Conditions Rate ds <br /> 2-YR[2.83"] 10-YR[4.23"] 100-YR[7.30"] <br /> PR1A(TO EX.WETLAND) 2.93 5.87 12.78 <br /> 1 P(PR1 B) 0.16 1.76 6.82 <br /> 2P(PR1C&PR4) 3.74 8.23 12.79 <br /> PR2(TO LONG LAKE RD) 0.29 0.52 1.07 <br /> TOTAL(REACH) 6.15 14.43 32.75 <br /> Overall Stormwater Rate Summary <br /> Existing Conditions Proposed Conditions <br /> Rate(cfs) Rate(cfs) <br /> 2-Year Event 10.51 6.15 <br /> 10-Year Event 19.11 14.43 <br /> 100-Year Event 39.01 32.75 <br /> Overall Stormwater Rate To Ex.Wetland-Obtained from 1 R in HydroCAD <br /> Existing Conditions Proposed Conditions <br /> Rate(cfs) Rate(cfs) <br /> 2-Year Event 10.33 6.16 <br /> 10-Year Event 18.76 13.91 <br /> 100-Year Event 38.25 31.12 <br /> Stormwater Water Quality and Volume Summary <br /> Drainage Area Required Infiltration Vol.Summary Filtration Volume=(New or reconstructed <br /> New Impv.Area(sf) Required Volume(cf) impervious(sf)*1.1 in)/(0.50*12(in/ft)) <br /> PR1A(TO EX.WETLAND) 0 0 <br /> PR1B(TO FIL BASIN 1) 22963 4210 <br /> PR1C(TO FIL BASIN 2) 23783 4360 <br /> PR2(TO LONG LAKE RD) 1396 256 <br /> PR3(TO EAST) 0 0 <br /> (OFF-SITE TO FIL.BASIN 2) N/A N/A <br /> TOTAL 48142 8826 <br /> Proposed BMP Area Provided Vol(co Drawdown Time Calculations 0.8"/Hour <br /> Inf.Area(sf) Assoc.Inf.Height(ft) Drawdown Time(h) <br /> Filtration Basin 1(Vol below 908.60) 4122 2525 1.63 24.49 <br /> Filtration Basin (Vol below 908.50) 5117 2909 1.76 26.39 <br /> TOTAL 9239 <br />