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Drainaqe Calculations for <br /> Richard A. Johnson property <br /> The calculation of release rate and detention storage volune are <br /> based on the entire 0.57 acre davalopment area, usinq the City of <br /> Everett tables. This resulte in a cunservative design, since <br /> there will also be saae attenuation of the runoff peak flow froa <br /> routing the roof drain through the wetland. It is probable that <br /> some or all the roof runoff will be retained, depending on the <br /> capacity of the wetland and surrounding upland soils. <br /> It is noted that the discharge to the wetland is a point release. <br /> The finish floor elevation of building 1, the cover requirenent <br /> over the pipa, and the requirement to ma�ntain some slope on the <br /> pipe conbine to drive the invert of the outlet down to elevation <br /> 565.3. This prever.ts the use of a dispersal system to spread the <br /> flows on the surface. FYon field inspection of the ditch where <br /> the discharqe is proposad, and of the surface adjacent and abova <br /> it, there appears to be no lost benefit from using a point <br /> releasa. <br /> Drainaqe calculations follow: <br /> � f <br /> r <br /> � <br /> e <br />, f <br /> C(t <br /> I � <br /> � I <br />� <br /> � <br /> ..',„'._.. ' i . � . <br /> I �� <br /> � n�. <br /> � <br /> ' � <br />