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<br />HALLETT MATERIALS - WINKLER QUARRY TA 88-146 <br />DRAINAGE REPORT 06/15/89 <br />RATIONAL METHOD STORM R UNOFF SUB-BASIN K <br />TIME OF CONCENTRATION = _ _ <br />INITIAL (OVERLAND) TIME <br /> L = 500 FT OVERLAND DISTANCE IN FEET <br /> S = 1.8 $ SLOPE IN PERCENT <br /> C5 = 0.10 OPEN AREA - CLAYEY SOIL <br /> Ti = 33.09 MIN 1.6*(1.1- C5)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL T IME <br /> L = 300 FT TRAVEL DI STANCE IN FEET <br /> S = 1.8 $ SLOPE IN PERCENT <br /> V = 3.2 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br /> Tt = 1.54 MIN DISTANCE / VELOCITY <br /> Tc = 34.63 MIN Ti + Tt <br /> C2 C5 C10 C100 <br />RUNOFF UDFCD <br />COEFFICI ENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 31.6 acres <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.55 2.10 2.43 3.81 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(C FS) 2.46 6.63 15.39 48.20 Q = c i A <br />ONE-HOUR V2 VS V10 V100 <br />VOLUME <br />(CUBIC FT) 5,104 13,770 31,970 100,147 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.12 0.32 0.73 2.30 <br />