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• S = ~~ - 10 (SCS METHOD) <br />C~`J <br />S = Ol 00 - 10 = 1,90 <br />84 <br />Runoff <br />Olp = (Plp - 0,2S)2 = 1,7 - (0,2 1,99) 2 = 0,54 in. <br />Plp + 0.8S 1,7 + 0,8 ( 1,90) <br />025 = (P2s _ 0,2S)2 = 2,1 - (0,2)(1.90) 2 = 0,82 in. <br />P25 + 0,85 2,1 + 0,8 (1,90) <br />peak Discharges <br />• For calculation of the peak discharge use "Procedures for <br />Determining Peak Flows in Colorado. Incorporates and Supplements <br />Technical Release No. 55 - Urban Hydrology for small watersheds." <br />Refer to Chapter 5 - tabular and graphical methods of determining <br />peak discharges. <br />4 = qP (~d) (i~) <br />q = hydrograph co-ordinate discharge in cf.s <br />(cubic feet per second) <br />q = csm/in (cubic feet per second per square mile <br />P <br />square mile per inch of runoff.) <br />~d = drainage area in square miles <br />0 = runoff in inches <br />• Assumption: 1) Time of Concentration = 6 min = 0,1 hrs. <br />2) Time of Travel = 0 <br />3) Drainage Area = 2,6 acres <br />= 1,00!1 mil <br /> <br />