problems_chapter 8 - Problems Chapter 8 Janet Barco CEE 151...

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1 Problems Chapter 8 Janet Barco CEE 151 Winter 2008 If you see typo errors….let me know
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2 Problem 1 500 acres watershed, 70% grass (Runoff Coef. = 0.45), 30 % forest (Runoff Coef. = 0.35),. Estimate the peak flow for 30 min storm and 50 years frequency using the Rational Method. Solution CIA Q = Form the IDF curve (next page), the rainfall intensity is = 6 in/hr C = Runoff coef. = (0.45*0.70)+(0.35*0.30) = 0.42 Q=0.42*(2.5 in/hr)*500 acres I : [in/hr] A: [acres] If : Q: [cfs] Q= 525 ft 3 /s
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