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<br />HALLETT MATERIALS - WINKLER QUARRY TA 88-146 <br />DRAINAGE REPORT 08/15/89 <br />RATIONAL METHOD STORM R UNOFF SUB-BASIN M <br /> -------------- --------- <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIME <br /> L = 500 FT OVERLAND DISTANCE IN FEET <br /> S = 1.0 ~ SLOPE IN PERCENT <br /> CS = 0.10 OPEN AREA - CLAYEY SOIL <br /> Ti = 40.25 MIN 1.8*(1.1- C5)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL T IME <br /> L = 500 FT TRAVEL DI STANCE IN FEET <br /> S = 1.0 $ SLOPE IN PERCENT <br /> V = 1.0 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br /> Tt = 8.33 MIN DISTANCE / VELOCITY <br /> Tc = 48.58 MIN Ti ~ Tt <br /> C2 CS C10 C100 <br />RUNU DFCD <br />COEFFICI ENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 15.6 acres <br />RAINFALL I2 IS I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.23 1.66 1.93 3.02 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 0.96 2.59 6.02 18.86 Q = c i A <br />ONE-HOUR V2 VS V10 V100 <br />VOLUME <br />(CUBIC FT) 2,801 7,558 17,547 54,967 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.06 0.17 0.40 1.26 <br />