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HW_3

# HW_3 - CE 451 Water Resource Engineering Home Work#3 3.27 A...

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1 CE 451 Water Resource Engineering 2/17/2010 Home Work #3 3.27. A storm lasting 6hr has 1.55 in. of rain and produces the following flows Time, hr Flow,cfs Time, hr Flow,cfs 0 20 28 110 4 110 32 80 8 180 36 60 12 250 40 40 16 200 44 30 20 160 48 20 24 130 The basin has an area of 12.5 mi 2 . Find the peak of the unit hydrograph. What fraction of the precipitation appeared as runoff? Assume negligible base flow. 3.33 . The rainfall-runoff relation for the 775-km 2 beaver creek basin under dry-soil condition is as follows: Rainfall,mm 2-hr storm runoff,mm 4-hr storm runoff,mm 6-hr storm runoff,mm 15 0 0 0 50 20 10 3 75 40 28 20 100 66 50 41 125 89 76 66 A storm of 2-hr effective duration occurred over this basin at a time when the soil was dry. The resulting hydrograph was as follows: Time, hr Flow, m 3 /s Time, hr Flow, m 3 /s 0 0 9 450 3 340 12 280 6 570 15 85 (a) Determine the number of millimeter of runoff from the basin resulting from this storm. Assume zero base flow.

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HW_3 - CE 451 Water Resource Engineering Home Work#3 3.27 A...

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