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Question: a trapezoidal channel to be excavated into the ground will...

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Problem #1 A trapezoidal channel to be excavated into the ground will be sized to carry Q 3200 cfs at normal flow. The bottom slope is So 0.0004 and the Manning roughness factor isn 0.020. If the bottom width of the channel is 10 ft and if cost of excavation is the main concern, which of the following alternatives for the channel side slope z is the best: (a) 1.5, (b) 2.0, or (c) 2.5? Neglect free board. Solve this problem using Excel. Show the results of your trial and error calculations for each case (i.e. include the excel tables). In addition, show a summary table of the final results for the 3 cases.
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