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Wetpond Calculations <br /> DevWQ Event Summary: <br /> BasinID Peak Q Peak T Peak Vol Area Method Raintype Event <br /> (cfs) (hrs) (ac-ft) ac /Loss <br /> DevWQ 4.98 8.00 1.6657 16.23 SBUH/SCS TYPE1A 2 yr <br /> DevWQ 8.05 8.00 2.7198 16.23 SBUH/SCS TYPE1A 10 yr <br /> DevWQ 9.20 8.00 3.1186 16.23 SBUH/SCS TYPE1A 100 yr <br /> DevWQ 3.52 8.00 1.1735 16.23 SBUH/SCS TYPE1A 6 mo <br /> Drainage Area:DevWQ <br /> Hyd Method: SBUH Hyd Loss Method: SCS CN Number <br /> Peak Factor: 484.00 SCS Abs: 0.20 <br /> Storm Dur: 24.00 hrs Intv: 10.00 min <br /> Area CN TC <br /> Pervious 1.0000 ac 86.00 0.08 hrs <br /> Impervious 15.2300 ac 98.00 0.08 hrs <br /> Total 16.2300 ac <br /> Supporting Data: <br /> Pervious CN Data: <br /> Landscaping(10%) 86.00 1.0000 ac <br /> Impervious CN Data: <br /> Pavement 98.00 15.2300 ac <br /> Pervious TC Data: <br /> Flow type: Description: Length: Slope: Coeff: Travel Time <br /> Fixed Min 0.00 ft 0.00% 5.0000 5.00 min <br /> Impervious TC Data: <br /> Flow type: Description: Length: Slope: Coeff: Travel Time <br /> Fixed Min 0.00 ft 0.00% 5.0000 5.00 min <br /> Required Water Quality Volume=(1.1735)(43,560)=51,118 cubic feet <br /> 85%=43,450 cubic feet 3-6' deep cell <br /> 15%=7,668 cubic feet in 2' deep average treatment cell <br /> DAVID EVANS AND ASSOCIATES,INC. <br /> UNDERWOOD GARTLAND EVERETT FEBRUARY 3,2015 <br /> STORMWATER SITE PLAN APPENDIX C <br />