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<br />HALIETT MATERIALS - WINKLER QUARRY TA 86-146 <br />DRAINAGE REPORT 08/15/89 <br />RATIONAL METHOD STORM RUNOFF SUB-BASIN E <br /> <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIME <br /> L = 500 FT OVERLAND DISTANCE IN FEET <br /> S = 2.5 8 SLOPE IN PERCENT <br /> C5 = 0.10 OPEN AREA - CLAYE Y SOIL <br /> Ti = 29.66 MIN 1.8*(1.1-CS)*( L )".5 / ( S )"1/3 <br /> (UDFCD CRITERIA MANUAL) <br />TRAVEL TIME <br />L = 1,100 FT TRAVEL DISTANCE IN FEET <br />S = 2.5 8 SLOPE IN PERCENT <br />V = 6.3 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br />Tt = 2.93 MIN DISTANCE / VELOCITY <br />Tc 32.59 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 41.3 acr es <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.62 2.18 2.53 3.96 ZONE I <br /> Q2 QS Q10 Q100 <br />PEAK RUNOFF <br />(C FS) 3.34 9.01 20.91 65.50 Q = c i A <br />ONE-HOUR V2 V5 V10 V100 <br />VOLUME <br />(CUBIC FT) 6,527 17,611 40,887 128,078 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.15 0.40 0.94 2.94 <br />