Laserfiche WebLink
<br />HALLETT MATERIALS - WINKLER QUARRY TA 86-146 <br />DRAINAGE REPORT 08/15/89 <br />RATIONAL METHOD STORM R UNOFF SUB-BASIN C <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 /> 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 T IME <br /> L = 1,900 FT TRAVEL DI STANCE IN FEET <br /> S = 1.3 ~ SLOPE IN PERCENT <br /> V = 1.7 FPS ( S ) 2 CURVE FIT SCS VEL CURVE <br /> Tt = 18.74 MIN DISTANCE / VELOCITY <br /> Tc = 56.99 MIN Ti + Tt <br /> C2 CS C10 C100 <br />RUNOFF UDFCD <br />COEFFICI ENTS 0.05 0.10 0.20 0.40 CLAYEY SOIL <br />AREA 105.2 acres <br />RAINFALL I2 IS I10 I100 <br />INTENSITIES DOUGLAS COUNTY <br />(INCHES/HR) 1.07 1.44 1.67 2.62 ZONE I <br /> Q2 Q5 Q10 Q100 <br />PEAK RUNOFF <br />(CFS) 5.61 15.14 35.16 110.13 Q = c i A <br />ONE-HOUR V2 V5 V10 V100 <br />VOLUME <br />(CUBIC FT) 19,863 53,592 124,422 389,757 V = Q*Tc (FAA) <br />(ACRE*FEET) 0.46 1.23 2.86 8.95 <br />