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I <br /> Stormwater Management Report Everett, WA <br /> ITc = 6.40 min. <br /> I <br /> Total Pervious Area = 1 .19 acres <br /> CN = 86 (grass & landscaping) <br /> Tc = 6.40 min. <br /> I <br /> The following table lists the areas input into StormSHED for detention analysis. <br /> IStormSHED Input <br /> Pre-developed Developed <br /> I <br /> (ac) (ac) <br /> Wood/Forest land 7.54 0.00 <br /> Grass/Landscape 0.00 1.19 <br /> ' Impervious 0.00 6.35 <br /> Total 7.54 7.54 <br /> Peak flows based upon the above input are as follows: <br /> IPeak Flows(cfs) <br /> 2-year 10-year 100-year <br /> I <br /> Pre-Dev 0.1709 0.7553 1.2373 <br /> Developed 2.2139 4.0421 5.1842 <br /> Allowable Release Rates (0.1709* .5) = 0.0855 0.7553 1.2373 <br /> The following are StormSHED's analytical output sheets for the stormwater detention <br /> I <br /> facility design: <br /> Start of live storage: 417.0000 ft <br /> IEvent Match Q (cfs) Peak Q (cfs) Peak Stg (ft) Vol (cf) Vol (acft) Time to Empty <br /> 2 year 0.0854 0.0801 420.0532 2821 7.20 0.6478 248.83 <br /> I <br /> 10 year 0.7553 0.6900 420.3949 32126.82 0.7375 254.00 <br /> 100 year 1 .2373 1 .2343 420.5581 34052.74 0.7817 254.17 <br /> IEvent Precip (in) <br /> 6 mo 0.9920 <br /> I2 year 1 .5500 <br /> 10 year 2.6000 <br /> I100 year 3.2500 <br /> I <br /> I <br /> PACLAND Job # 50108001 Page 14 <br />