Laserfiche WebLink
<br />HALLETT MATERIALS - WINKLER QUARRY <br />DRAINAGE REPORT <br />RATIONAL METHOD STORM RUNOFF <br />TIME OF CONCENTRATION <br />INITIAL (OVERLAND) TIME <br /> <br />TA 88-146 <br />08/15/89 <br />SUB-BASIN J <br />L = 500 FT OVERLAND DISTANCE IN FEET <br />S = 1.0 $ SLOPE IN PERCENT <br />C5 = 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 TIME <br />L = 500 FT TRAVEL DISTANCE IN FEET <br />S = 1.0 ~ SLOPE IN PERCENT <br />V = 1.0 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br />Tt 6.33 MIN DISTANCE / VELOCITY <br />Tc 48.58 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 26.0 acr es <br />RAINFALL I2 I5 I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.23 1.66 1.93 3.02 ZONE I <br /> Q2 QS Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 1.60 4.32 10.03 31.43 Q = c i R <br />ONE-HOUR V2 VS V10 V100 <br />VOLUME <br />(CUBIC FT) 4,669 12,597 29,245 91,612 V = Q"Tc (FAA) <br />(ACRE"FEET) 0.11 0.29 0.67 2.10 <br />