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3 <br />Convevance Caiculation <br />WSU NPSE Gravel Parking Lots - Index Site Calculation By: Kimberly McNabb �Reference: City of Everett Stormwater Manual <br />25 YR <br />Location Discharge Pipe Design <br />Flow <br />From To Drainage Drainage Proposed Ex Runoff Cumulative Pipe Pipe Slope Velocity <br />Drain ID Structure Structure Source Area (A) Runoff cfs cfs Flow cfs Diameter (in) (°/o) ft/s <br />SD1 CB1 C62 Site 0.40 0.22 0 0.22 8 1.0% 3.21 <br />SD2 C62 C63 Site 0.40 0.22 0 0.44 8 1.0% 3.21 <br />SD3 CB3 CB4 Site 0.05 0.029 0 0.47 8 2.1% 4.66 <br />SD4 CB4 C65 Ex Parking 0.74 0.00 0.44 0.91 8 1.8% 4.31 <br />Pipe <br />Capacity Percent <br />cfs Capacity <br />1.12 20% <br />1.12 39% <br />1.63 29% <br />1.51 60% <br />Check <br />OK <br />OK <br />OK <br />OK <br />Comments <br />