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Preliminary Stormwater Site Plan Everett,WA <br /> 1 Powdermill Gulch Creek Drainage Area: <br /> I PRE-PMG Event Summary <br /> Event Peak Q (cfs) Peak T (hrs) Hyd Vol (acft) Area (ac) Method ;Raintype <br /> 6 mo 0.0362 1 22.00 [ 0.0397 5.0000 SBUH TYPE1A <br /> -2 year 0.1235 9.17 0.1420 5.0000 ! SBUH ITYPEIA <br /> I year <br /> e ------ 0.4226 ;--TYPE1A <br /> 10 year 0.5683 i 8.50 r i 5.0000 � SBUH TYPE1A <br /> 1100 year! 0.9360 i 8.17 0.6285 j 5.0000 i SBUH j TYPE1A j <br /> I Record Id: PRE-PMG <br /> Design Method 1 SBUH Rainfall type TYPE1A <br /> IHyd Inty I 10.00 min !Peaking Factor [ 484.00 <br /> ii I ! Abstraction Coeff 0.20 <br /> 111 ,Pervious Area (AMC 2) ; 5.00 ac___ [DCIA I0.00 ac <br /> !Pervious CN 1 81.00 [DC CN 0.00 <br /> I ,Pervious TC 7 44.18 min jDC TC 0.00 min <br /> 11 Pervious CN Calc 1 <br /> __ _--------------I Description ----------------------- -- [ SubArea Sub cn <br /> II <br /> ii j Wood/forest land (young 2nd growth/brush) 5.00 ac 81.00 <br /> I1 Pervious Composited CN (AMC 2) [ 81.00 <br /> 'i Pervious TC Calc <br /> I <br /> i __r. Len th rSlo a Coeff Misc ! TT Type ( Description g p I. <br /> jSheet iWoods or forest with light 300.00 18 70% 0.4000 1.55 141.27 li <br /> underbrush.: 0.40 ift il <br /> iin 1min <br /> Brush ground with some trees �300.00 <br /> Shallow�(n=0 060) ft 10.30 0 1 .0600 2.91 min <br /> 11 1 i <br /> Pervious TC 44.18 ;I <br /> H; min 3i <br /> I <br /> I <br /> I <br /> I <br /> IPACLAND Job# 50175001 Page 9 <br />