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I <br /> Stormwater Management Report Everett, WA <br /> I <br /> I Exhibit E <br /> StormShed Calculations <br /> New Impervious Surface Event Summary <br /> I Event 1 Peak Q (cfs) 1 Peak T (hrs) 1 Hyd Vol (acft) 1 Area (ac) ! Method 1 Raintype I <br /> 6 mo I 0.1589 ! 8.00 ! 0.0529 ! 0.810 [ SBUH 1 TYPE1A <br /> I Designi Method Record Id: New Paving <br /> SBUH Rainfall type TYPE1A <br /> ,Hyd Intv 10.00 min ;Peaking Factor 484.00 1 <br /> 1 : <br /> , 'Abstraction Coeff 0.20 <br /> Pervious Area (AMC 2) 0.00 ac ,DCIA 0.81 ac <br /> I Pervious CN ! 0.00 <br /> DC CN <br /> 98.00 <br /> Pervious TC 0.00 min DC TC 6.40 min <br /> I Directly Connected CN Calc ,. <br /> ii <br /> 1, <br /> , <br /> I Description 1 SubArea I Sub cn <br /> I 1 Impervious surfaces (pavements, roofs, etc) <br /> • 0.81 ac 1 98.00 <br /> DC Composited CN (AMC 2) <br /> 98.00 1 1 <br /> IDirectly Connected TC Calc <br /> Type Description Length 1 Slope ' Coeff ! Misc TT ,! <br /> II Fixed Over New Pavement . 16.40 min <br /> Directly Connected TC I 6.40min <br /> I <br /> 0.0529 ac-ft x (43,3560 CF /ac-ft) = 2,305 CF Required Treatment Volume <br /> I <br /> I <br /> I <br /> I <br /> IPACLAND Job# 50183001 Page 14 <br />