cee4324-5984-f11hw8-solutions

cee4324-5984-f11hw8-solutions - Virginia Tech Department of...

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Unformatted text preview: Virginia Tech Department of Civil and Environmental Engineering CEE 43245984 — Open Channel Flow Homework #8: Surface Water Profiles (continued) Due November 10, 2011 Problem 1: (4 points) A rectangular channel, 10.0 ft wide, carries a flow of 100 it3fs. The slope of the channel 80:0.005 fifft, and Manning’s a is 0.030. The flow encounters a step of height 0.?0 feet. The depths far upstream and downstream ofthe step are equal to the normal depth, yo. (a) Calculate yo. (b) Is the reach mild, steep, or critical? (c) Sketch all profiles both upstream and downstream of the step. (d) On your sketch, indicate the upstream and downstream depths of each profile you draw and provide supporting calculations. Problem 2: (4 points) A rectangular channel, 100 ft wide, carries a flow of 100 Wis. The slope of the channel 80—001 tht, and Manning’s n is 0.020. The flow enters a rectangular constriction to a width of5.0 feet. The depths far upstream and downstream of the step are equal to the normal depth, ya. (3) Calculate yo. (b) Is the reach mild, steep, or critical? (c) Sketch all profiles both upstream and downstream of the step. (d) On your sketch, indicate the upstream and downstream depths of each profile you draw and provide supporting calculations. Problem 3: (5 points) Given q = 5.0 ftzfs andyfl=l.75 feet. (a) Is the reach mild, steep, or critical? (b) For a gate opening of 0.50 feet i. Find the depth immediately upstream of the gate. ii. What is observed downstream of the gate? iii. Sketch the profiles and indicate all relevant depths on the sketch. (0) For a gate Opening of 0.40 feet i. Find the depth immediately upstream of the gate. ii. What is observed downstream of the gate? iii. Sketch the profiles and indicate all relevant depths on the sketch. alibi ___——-— ' J _._J 'i QM 4-5 74.35%» I192" _‘ t H I {-1.9er i I 1‘: w _ f a; db %¢;<;3* 54” 5-2- 072me 32.2.. —/_ ’ 53nd; at! :: L?{> 2': 0.‘?Z. '—'F ...
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This note was uploaded on 12/24/2011 for the course CEE 4324 taught by Professor Moglen during the Fall '11 term at Virginia Tech.

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cee4324-5984-f11hw8-solutions - Virginia Tech Department of...

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