Question

A long rectangular concrete channel (b = 10 ft, n = 0.015) carries 400 cfs. There is a grade break in the channel; the slope upstream of the grade break is 0.02 and the slope downstream of the grade break is 0.002. The following equations are valid for a rectangular channel: • DC = [(Q2)/(g*b2)]1/3 • y2 = 0.5*y1*[(1+8NFr12)1/2 -1] (for hydraulic jump) • NFr = v/(g*y)1/2 a) Use calculations to classify each section of the channel (steep, mild, horizontal, adverse or critical) and show that a hydraulic jump can occur b) Show with calculations whether the hydraulic jump will occur upstream of the grade break, at the grade break or downstream of the grade break, and sketch channel profile c) Estimate energy lost in the hydraulic jump

Answer 1

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