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Al <br />Slormwater Detention Caetelotion . City of Everett Method <br />Perleel Enghmrhvg - 202S Colby Ave, Suite 410, Everett <br />Phone (206) IM7233 <br />Project: My's Pim-19111 Street <br />Date: a ..ri0r000t /n. y 13,19 9.2 <br />Brio: Wood Creek <br />Total Parcel Ara: I.20 Acres Slope: 3.3% <br />Proposed: <br />Existing: <br />%Woods: <br />0.0% <br />%lacros: <br />915% <br />%lawns: <br />17.7% <br />g•g% <br />%Earth: <br />0.0% <br />7.5% <br />%Imperv: <br />%ImpeM <br />0.00 <br />0.00 <br />Design Stem (Table 1) <br />Pre -Develop 2 Yrs. <br />Post -Develop 25 Yro' <br />Allowable Release Rate: (Tables 2 - 5) <br />Weeds <br />0.002 cfslac <br />0.000 <br />lava <br />Earth0.401 <br />0.003 ctslac. <br />cWac <br />0.092 <br />,/ V <br />Impervious <br />0.936 crolsc <br />0•0&4 <br />��JCCi11� <br />SUM = <br />&is <br />1 <br />r min. orifice <br />0.23 crs <br />0.23 <br />cis = 0.193 cG <br />Detention Storage Required: (Table 7) <br />lawn 621 cu.f1/ac 132 <br />Firth 2351 cwff.t c 0 <br />lmpervio= 3121 cu,fl./sc 3002 <br />TOTAL REQUIRED STORAGE = 3,210 C.F. <br />MAY13��.L <br />_T <br />TABLE 1 <br />Design Ste <br />Drainage Pre. Post. <br />Basin Develop Devebjj <br />Combined Sewer <br />Downbwn Arcs 10 Yr. <br />s <br />Combined Sewer <br />Outside Downl'n 10 Yr. <br />Powder Mill 1 2Yr. <br />Pigeon Creek #2 <br />West Branch 2 Yr. <br />Pigeon Creek k2 <br />Eost Branch <br />Wood Creek <br />Gemrod Creek <br />North Creek <br />50 Yr. <br />10 Yr. <br />25 Yr. <br />25 Yr. <br />5 Yr. i 25 Yr. <br />MAY 1 9r,1 <br />6.9AY � o <br />'LBuj (ing'VRv <br />AO-ron <br />Building i <br />2s Yr. <br />