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I <br /> IValley Electric Building Offsite Drainage Improvements <br /> Sedimentation Pond Sizing Runoff Calcs <br /> IOffsite Erosion Event Summary: <br /> BasinID Peak Q Peak T Peak Vol Area Method Raintype <br /> Event <br /> I (cfs) (hrs) (ac-ft) ac /Loss <br /> Offsite Erosion 2.48 8.17 1.2285 15.00 SBUH/SCS TYPE1A 10 yr <br /> I Drainage Area: Offsite Erosion <br /> Hyd Method: SBUH Hyd Loss Method: SCS CN Number <br /> Peak Factor: 484.00 SCS Abs: 0.20 <br /> I <br /> Storm Dur: 24.00 hrs Intv: 10.00 min <br /> Area CN TC <br /> Pervious 15.0000 ac 85.00 0.28 hrs <br /> Impervious 0.0000 ac 0.00 0.00 hrs <br /> I Total 15.0000 ac <br /> Supporting Data: <br /> Pervious CN Data: <br /> I Vacant Lots 85.00 15.0000 ac <br /> Pervious TC Data: <br /> Flow type: Description: Length: Slope: Coeff: Travel Time <br /> Sheet Sheet over sparse grass 300.00 ft 2.00% 0.0500 14.08 min <br /> 1 Shallow Shallow 300.00 ft 2.00% 13.0000 2.72 min <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br />