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cee4324-5984-f11hw6 - Fill out the following influence...

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Virginia Tech Department of Civil and Environmental Engineering CEE 4324/5984 Open Channel Flow Homework #6: Flow Resistance and Normal Depth Due November 20, 2011 Problem 1: Given: Q = 50 ft 3 /s S = 0.01 ft/ft b = 20 ft Manning’s n = 0.02 Find: Critical depth: y c : Normal depth: y 0 : Classify Reach: (steep or mild?) Now let s see how modest changes in the givens affects normal depth and the Froude number. Let each of the parameters shown below change by a modest amount (suggest ~1-2 percent). Fill
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Unformatted text preview: Fill out the following influence chart: Influence Chart Increase in this Parameter Effect on Normal Depth Effect on Froude Number Q S b Manning’s n Problem 2: You are asked to design a rectangular channel. The discharge is 50 ft 3 /s, slope is 0.01 ft/ft, Manning’s n is 0.02 (i.e. like in Problem 1 above.) Your design is defined as most efficient if the cross-sectional area is minimized. What channel width, “ b ”, will produce the most efficient channel for these conditions?...
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