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<br />HALLETT MATERIALS - WINKLER QUARRY TA 68-146 <br />DRAINAGE REPORT 08/15/89 <br />RATIONAL METHOD STORM RUNOFF SUB-BASIN H <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIME <br />L = 500 FT OVERLAND DISTANCE IN FEET <br />S = 1.5 ~ SLOPE IN PERCENT <br />C5 = 0.10 OPEN AREA - CLAYEY SOIL <br />Ti = 35.16 MIN 1.8*(1.1- CS)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITE IA MANUAL) <br />TRAVEL TIME <br />L = 0 FT TRAVEL DI STANCE IN FEET <br />S = 1.0 ~ SLOPE IN PERCENT <br />V = 1.0 FPS ( S ) " 2 CURVE FIT S CS VEL CURVE <br />Tt = 0.00 MIN DISTANCE / VELOCITY <br />Tc = 35.16 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 15.1 acres <br />RAINFALL I2 IS I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.54 2.08 2.41 3.78 ZONE I <br /> Q2 QS Q10 Q100 <br />PEAK RUNOFF <br />(C FS) 1.16 3.14 7.28 22.60 Q = c i A <br />ONE-HOUR V2 VS V10 V100 <br />VOLUME <br />(CUBIC FT) 2,452 6,615 15,358 48,109 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.06 0.15 0.35 1.10 <br />