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Evergreen Public Library Conveyance Calculations Printed 12/8/2018 <br />12" Pipe Downstream of CB-11 lqjffDRAINAGE RUNOFF CALCULATIONS (RATIONAL METHOD)r <br />AREA C AREA (SF) Area (AC) (Area (AC)*C) Total Area (AC) Composite C <br />GRASS15,246 <br />PAVEMENT 43,386 <br />TC=I 5'(MIN) <br />25 Year Storm <br />m = 2017 City of Everett Design and Construction Standards 4-3.1 (1; <br />n = 0.582 <br />I = 3.G7 (IN/HR) <br />Flow (Rational) = 3.02 (CFS) <br />PIPE CAPACITY CALCULATIONS (MANNING'S EQUATION) <br />Roughness Coefficient= 0.012' <br />Diameter = 12 in <br />Slope = 0.75 <br />Capacity = 3.35 cfs JOK <br />Z:\1700001-1700999\1700170 (Everett Public Library South Expansion)\PROJECT DOCUMENTS\Storm Drainage\Calculations\Conveyance\RATIONAL <br />METHOD (EVERETT) CB-11.xlsx <br />