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I <br /> Stormwater Management Report Everett, WA <br /> I <br /> I POST Event Summary <br /> Event Peak Q (cfs) Peak T (hrs) Hyd Vol (acft) Area (ac) Method Raintype <br /> 6 mo 1 .2626 8.00 A 7.5400 SBUH TYPE1A <br /> I2 year 2.2139 8.00 0.7556 7.5400 SBUH TYPE1A <br /> 10 year 4.0421 8.00 1 .3856 7.5400 SBUH TYPE1A <br /> I100 year 5.1842 8.00 1 .7829 7.5400 SBUH TYPE1A <br /> Record Id: POST <br /> IDesign Method SBUH Rainfall type TYPE1A <br /> Hyd Inty 10.00 min Peaking Factor 484.00 <br /> 1 Abstraction Coeff 0.20 <br /> Pervious Area (AMC 2) 1 .19 ac DCIA 6.35 ac <br /> IPervious CN 86.00 DC CN 98.00 <br /> Pervious TC 6.40 min DC TC 6.40 min <br /> IPervious CN Calc <br /> Description SubArea Sub cn <br /> I Open spaces, lawns,parks (> 75% grass) 1 .19 ac 86.00 <br /> Pervious Composited CN (AMC 2) 86.00 <br /> 1 Pervious TC Calc <br /> Type Description Length Slope Coeff Misc TT <br /> I Sheet Dense grasses : 0.24 38.00 ft 50.00% 0.2400 1 .55 m61 <br /> in Shallow in <br /> Short grass, pasture and lawns 20.00 ft 2.00% 0.0300 0.22 <br /> I <br /> (n=0.030) min <br /> Channel 3.57 <br /> Concrete pipe (n=0.012) 1820.00 4.00% 0.0120 min <br /> Pervious TC 6.40 <br /> min <br /> IDirectly Connected CN Calc <br /> Description SubArea Sub cn <br /> IImpervious surfaces (pavements, roofs, etc) 6.35 ac 98.00 <br /> DC Composited CN (AMC 2) 98.00 <br /> IDirectly Connected TC Calc <br /> I <br /> IPACLAND Job # 50108001 Page 15 <br />