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I <br /> Preliminary Stormwater Site Plan Everett, WA <br /> IDeveloped Site Flows: <br /> I POST Event Summary <br /> Event Peak Q (cfs) Peak T (hrs) Hyd Vol (acft) Area (ac) Method Raintype <br /> 6 mo 4.1481 8.00 1.8189 37.5000 SBUH TYPE1A <br /> 2 year 8.2900 8.00 3.4105 37.5000 SBUH TYPE1A <br /> 10 year 16.3419 8.00 6.5597 37.5000 SBUH TYPE1A <br /> I100 year 21 .3133 8.00 8.5471 37.5000 SBUH TYPE1A <br /> Record Id: POST <br /> IDesign Method SBUH Rainfall type TYPE1A <br /> Hyd Inty 10.00 min Peaking Factor 484.00 <br /> IAbstraction Coeff 0.20 <br /> Pervious Area (AMC 2) 37.50 ac DCIA 0.00 ac <br /> I Pervious CN 95.40 DC CN 0.00 <br /> Pervious TC 18.15 min DC TC 0.00 min <br /> I Pervious CN Calc <br /> Description SubArea Sub cn <br /> Open spaces, lawns,parks (> 75% grass) 5.50 ac 86.00 <br /> Impervious surfaces (pavements, roofs, etc) 22.00 ac j 98.00_ <br /> Wood/forest land (young 2nd growth/brush) 10.00 ac L, 81.00 J r;6,7/ <br /> If Pervious Composited CN (AMC 2) 91.71 14 <br /> r , it) ' S` <br /> Pervious TC Calc �aCe <br /> IType Description Length Slope Coeff Misc TT <br /> Sheet Dense grasses : 0.24 80.00 ft 6.00% 0.2400 1 .55 in 11 .05 min r.a( <br /> ISheet Smooth Surfaces.: 0.011 30.00 ft 3.00% 0.0110 1 .55 in 0.56 min rs `�/v1 <br /> Shallow Paved 340.00 ft 3.00% 0.0100 1 .61 min h � <br /> IShallow Paved 1200.00 ft 4.00% 0.0100 4.92 min <br /> Pervious TC 18.15 min <br /> I <br /> I <br /> I <br /> Il <br /> PACLAN D Job# 50175001 Page 11 <br />