HW_2 - CE 451 Water Resource Engineering Home Work#2 Due...

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1 CE 451 Water Resource Engineering Home Work # 2, Due 02/0 8 /2010 3.3. A flood hydrograph of a stream having a catchment area of 240 km 2 is tabulated in the following. Separate the hydrograph into its components and determine and direct runoff volume in cubic meters and centimeters. Time, hr Flow, m 3 /s Time, hr Flow, m 3 /s 0 1.29 50 8.47 5 1.25 55 6.55 10 1.1 60 5.26 15 4.82 65 3.93 20 11.52 70 2.61 25 15 75 1.88 30 16.93 80 1.09 35 14.81 85 0.62 40 12.22 90 0.54 45 10.27 3.8. The following data were gathered during a single 6- month period from individual rainstorms on a basin where was no snowfall: Date of storm Average basin rainfall, in. Basin runoff, in. Duration of rain, hr Feb. 2.2 0.6 12 Feb. 0.8 0.0 12 Mar. 2.6 1.2 12 Apr. 1.4 0.4 12 May. 0.4 0.0 12 May. 3.0 1.8 12 Jun. 1.2 0.6 12 Jun. 2.8 2.0 12 July 2.0 1.4 12 From these data answer the following questions: (a) A bout how much runoff would there have been from a 12-hr, 2.0-in. rain in June? (b) If the storm mentioned in (a) had occurred in 8 hr instead of 12 hr, would the runoff have been greater or less than that indicated by your answer to (a)? Why?
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