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<br />DR~I~GE Cij~TERIA MANUAL <br /> <br />RUNOFF <br /> <br />. <br /> <br />C = 1-(1-C1) ~t/B = 0.28 <br /> <br />Step 4. <br /> <br />Set up Equation 4-7 and enter coefficients in Table 4-6 <br /> <br />O2 = (1.-0.28)01 + (0.28)11 = (0.72)01 + (0.28)11 <br /> <br />Step 5. Route the storm hydrograph from Sub-Basin 1 (Point A) through <br />reech A-B using Equation in Step 4: <br /> <br />a) Set up Table 4-6 by filling in the Inflow column <br /> <br />b) Start with zero inflow at t = 15, namely 11 = O. <br /> <br /> c) The starting routed outflow at t = 15 is also Zero, namely <br /> 01 = O. <br /> d) Calculate O2 = (0.72 x 0.)+(0.28 x 0.) = O. <br />. e) Enter O. in the routed outflow column for t = 20. <br /> f) Calculate O2; O2 = (0.72 x 0.)+(0.2B x 2) =0.54. <br /> g) Enter 0.54 in the routed outflow Column 3 at t = 25. <br /> h) Calculate O2; O2 = (.72 x .54)+(.28 x 10) = 3.2. <br /> ;) Enter 3.2 in the routed outflow Column 3 at t = 30. <br /> <br />j) Repeat the procedure until the entire hydrograph has been <br />routed. <br /> <br />St~p 6. Enter the sum of the local hydrographs frDm Basins 1 and 2 as <br />Locel Inflow for Reach A-B in Column 4. <br /> <br />. <br /> <br />5-1-ag <br />