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ISca���a}''fracl 1 - Lm ? <br /> Storm Dminacc Rcport <br /> I 5 Detention Calculations <br /> ( Detention for the developed site will be provided in an offsite regional detention <br /> facility located on the adjacent properly to the east. A iheoretical detention <br /> � volume will be calculated as if the site was required to meet the Washington <br /> State Department of Ecology detention standards. The theoretical detention <br /> � facility will release the developed flows at a rate equal to or less than 50% of the <br /> 2-year, and matching the 10 and 10Q-year predeveloped storm events. <br /> IPredeveloped Site Conditions <br /> � Hyd Method: SBUH Hyd Loss hlethod: SCS CN Number <br /> Peak Faclor: 484.00 SCS Abs: 0.20 <br /> Slorm Dur. 24.00 hrs Inlv: 10.00 min <br /> Area CN TC <br /> I Pervious 1.6800 ac 81.00 0.93 hrs <br /> Impervious 0.0000 ac 0.00 0.00 lirs <br /> Total 1.6800 ac <br /> ISupporting Data: <br /> Pervious CN Data: <br /> second growth forest 81.00 1.6800 ac <br /> I Pervious TC Data: <br /> Flow rype: Description: Length: Slope: Coe(f: Travel Time <br /> Slieet reach 1 300.00 ft 5.00% 0.4000 51.50 min <br /> IShallow reach 2 165.00 it 5.00% 3.0000 4.10 min <br /> Predeveloped Site Flows <br /> fBasinlD Peak Q Peak T Peak Vol Area Method Rainlype Event � <br /> I I ------- (cfs) (hrs) (ac-tt) ac ILoss <br /> predev OAJ 9.67 0.0477 1.68 SBUHISCS TYPEIA 2yr <br /> pmdev 0.12 8.�7 0.1057 1.68 SBUH/SCS TYPEIA t0yr <br /> predev 020 8.50 02068 7.68 S[3UH/SCS TYPEIA t00yr <br /> predr:v OA1 22.00 0.0132 1.68 SOUHlSCS TYPEIA 6-monih <br /> I <br /> � <br /> � <br /> I <br /> 1 <br /> I cbiuei� ' 'nii.l _. Papc o <br /> � �1'Rlt\D <br /> �- <br />