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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 A <br /> <br />TIME OF <br />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- CS)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL T IME <br /> L = 1,400 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 = 23.33 MIN DISTANCE / VELOCITY <br /> Tc = 63.58 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 76.3 acres <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.06 1.43 1.66 2.60 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 4.04 10.91 25.33 79.35 Q = c i A <br />ONE-HOUR V2 V5 V10 V100 <br />VOLUME <br />(CUBIC FT) 15,427 41,625 96,639 302,724 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.35 0.96 2.22 6.95 <br />