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<br />HALLETT MATERIALS - WINKLER QUARRY TA 88-146 <br />DRAINAGE REPORT 08/15/69 <br />RATIONAL METHOD STORM RUNOFF SUB-BASIN F <br /> <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIM E <br />L = 500 FT OVERLAND DISTANCE IN FEET <br />S = 3.3 8 SLOPE IN PERCENT <br />C5 = 0.10 OPEN AREA - CLAYEY SOIL <br />Ti = 27.03 MIN 1.8*(1.1- C5)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL TIME <br />L = 1,100 FT TRAVEL DI STANCE IN FEET <br />S = 2.5 $ SLOPE IN PERCENT <br />V = 6.3 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br />Tt = 2.93 MIN DISTANCE / VELOCITY <br />Tc = 29.97 MIN Ti + Tt <br /> C2 CS C10 C100 <br />RUNOFF UDFCD <br />COEFFICIENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 22.3 acres <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.70 2.30 2.67 4.18 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 1.90 5.13 11.90 37.27 Q = c i A <br />ONE-HOUR V2 V5 V10 V100 <br />VOLUME <br />(CUBIC FT) 3,416 9,215 21,395 67,021 V Q*Tc (FAA) <br />(ACRE*FEET) 0.08 0.21 0.49 1.54 <br />