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I <br /> Detention Volume Calculations: <br /> I <br /> Per the Everett Stormwater Management Manual figure 5.1 Volume Correction Factor, and the <br /> percentage of the developed area within Narbeck Creek that is impervious of 74%, a volume <br /> correction factor of 1.4 shall be applied to detention facility. <br /> I <br /> 0 50 <br /> I <br /> - . . <br /> 0.45 <br /> I <br /> 0 40 -* <br /> I <br /> 0 35 <br /> I <br /> -,... <br /> 4 <br /> = <br /> * <br /> -....-: 0 3G <br /> ea <br /> N <br /> = ' <br /> cd <br /> 0 25 ' <br /> 0.20 1 <br /> 0.15 <br /> I <br /> ,t-- <br /> 0.10 <br /> 0 20 40 €0 80 100 I <br /> Site Impervious Cover(%) <br /> I <br /> Figure Si Volume Correction Factor <br /> Correction Factor = 1.40 <br /> Required length of 6' detention pipe = 45.0' x 1.40 = 63.0' <br /> Powdermill Gulch Creek: I <br /> Since the Powdermill Gulch Creek portion of the property drains to an existing regional detention <br /> pond, no onsite flow control is required. <br /> 6/16/2011 Stormwater Site Plan Page 28 I <br /> I <br />