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<br />HALLETT MATERIALS - WINKLER QUARRY TA 88-146 <br />DRAINAGE REPORT 06/15/89 <br />RATIONAL METHOD STORM R UNOFF SU8-BASIN I <br /> _ _ _ <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIME <br /> L = 500 FT OVERLAN^ 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-C5)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL T IME <br /> L = 100 FT TRAVEL DISTANCE IN FEET <br /> S = 1.5 $ SLOPE IN PERCENT <br /> V = 2.3 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br /> Tt = 0.74 MIN DISTANCE / VELOCITY <br /> Tc 35.90 MIN Ti + Tt <br /> C2 CS C10 C100 <br />RUNOFF UDFCD <br />COEFFICI ENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 23.6 acres <br />RAINFALL I2 IS I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.52 2.05 2.38 3.72 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 1.79 4.63 11.22 35.16 Q = c i A <br />ONE-HOUR V2 VS V10 V100 <br />VOLUME <br />(CUBIC FT) 3,659 10,413 24,176 75,732 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.09 0.24 0.56 1.74 <br />