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<br />HALLETT MATERIALS - WINKLER QUARRY TA 88-146 <br />DRAINAGE REPORT 06/15/89 <br />RATIONAL METHOD STORM RUNOFF SUB-BASIN D <br /> <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIM E <br />L = 500 FT OVERLAND DISTANCE IN FEET <br />S = 0.6 8 SLOPE IN PERCENT <br />C5 = 0.10 OPEN AREA - CLAYEY SOIL <br />Ti = 47.72 MIN 1.8*(1.1- C5)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL TIME <br />L = 1,300 FT TRAVEL DI STANCE IN FEET <br />S = 1.5 ~ SLOPE IN PERCENT <br />V = 2.3 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br />Tt = 9.63 MIN DISTANCE / VELOCITY <br />Tc = 57.35 MIN Ti + Tt <br /> C2 C5 C10 C100 <br />RUNOFF UDFCD <br />COEFFICIENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 27.0 acres <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.09 1.47 1.71 2.67 ZONE I <br /> Q2 QS Q10 Q100 <br />PEAK RUNOFF <br />(C FS) 1.47 3.97 9.22 28.87 Q c i A <br />ONE-HOUR V2 V5 V10 V100 <br />VOLUME <br />(CUBIC FT) 5,063 13,661 31,716 99,351 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.12 0.31 0.73 2.28 <br />