Following is the hydrograph data from 24-hr storm, 25-yr event (0.2…

Following is the hydrograph data from 24-hr storm, 25-yr event (0.2…

Following is the hydrograph data from 24-hr storm, 25-yr event (0.2

in/hr for 24-hr) for a drainage basin of 150 acre. It is desired to compute the unit hydrograph from the given data. Even though following the procedure as mentioned in the text books, the result is not convincing as runoff hydrograph is smaller than unit hydrograph. Could you please help me? In deed I computed the direct runoff from the hydrograph and divided by the drainage area to get effective runoff. Then all the ordinates are divided by effective runoff, which results with bigger values than hydrograph has. Time (min) Q (cfs) 0 0 4.92 14.73 9.84 49.10 14.76 93.29 19.68 152.21 24.6 230.77 29.52 324.06 34.44 402.62 39.36 456.63 44.28 486.09 49.2 491.00 54.12 486.09 59.04 456.63 63.96 422.26 68.88 382.98 73.8 333.88 78.72 274.96 83.64 225.86 88.56 191.49 93.48 162.03 98.4 137.48 108.24 101.64 118.08 72.18 127.92 52.54 137.76 37.81 147.6 27.01 157.44 19.64 167.28 14.24 177.12 10.31 186.96 7.37 196.8 5.40 221.4 2.46 246 0.00

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