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11/05 <br /> CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> 0.50 <br /> ir(9'5Z--> <br /> 11111 <br /> .it.. <br /> iprr <br /> 0.40 <br /> 10.35 <br /> g 0.30 <br /> • <br /> 0.25 <br /> 0.20 <br /> 0.15 <br /> { <br /> 0.10 <br /> 0 20 40 60 80 100 <br /> Site Impervious Cover(%) <br /> Figure 5.1 Volume Correction Factor <br /> 5.5 Closed Depression Analysis <br /> A closed depression is a low-lying area which has no outlet,or such a limited surface outlet that in most <br /> storms events,the area acts as a ietcntion basin and holds water for infiltration or evapo-transpiration. <br /> The presence of a hydrologically significant closed depression on a site requires cal aful analysis,both of its <br /> role in the predeveloped condition hydrology and the effect that increased development runoff may have on <br /> the closed depression. Careful assessment of the existing hydrologic performance is required. <br /> Closed depressions generally facilitate infiltration of runoff. If a closed depression is classified as a <br /> wetland or the discharge path flows through a wetland,then Minimum Requirement#8 for wetlands <br /> Volume l—Minimum Technical Requirements <br /> 5-13 <br />