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Les Schwab Truck Center WQ Treatment Calculations <br /> Post Developed Event Summary (roof runoff bypassed): <br /> Basin ID Peak Q Peak T Peak Vol Area Method Raintype <br /> Event <br /> (cfs) (hrs) (cf) ac /Loss <br /> pston rev 0.03 8.00 388.1 0.18 SBUH/SCS TYPE1A 6 mo <br /> Drainage Area: Post Developed On Site (excludes roof area) <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 Inty: 10.00 min <br /> Area CN TC <br /> Pervious 0.0500 ac 80.00 0.13 hrs <br /> Impervious 0.1300 ac 98.00 0.08 hrs <br /> Total 0.1800 ac <br /> Supporting Data: <br /> Pervious CN Data: <br /> pervious 80.00 0.0500 ac <br /> Impervious CN Data: <br /> existing impervious 98.00 0.1300 ac <br /> Pervious TC Data: <br /> Flow type: Description: Length: Slope: Coeff: Travel Time <br /> Fixed combined 0.00 ft 0.00% 7.5000 7.50 min <br /> Impervious TC Data: <br /> Flow type: Description: Length: Slope: Coeff: Travel Time <br /> Fixed None Entered 0.00 ft 0.00% 5.0000 5.00 min <br />