cee4324-5984-f11hw9

# cee4324-5984-f11hw9 - Virginia Tech Department of Civil and...

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Virginia Tech Department of Civil and Environmental Engineering CEE 4324/5984 Open Channel Flow Homework #9: Qualitative and Quantitative Surface Water Profiles Due December 1, 2011 Problem 1: (4 points) Given the junction of two rectangular reaches, “A” and “B”, carrying a discharge of 200 ft 3 /s as follows: Upstream Reach “A” Downstream Reach “B” Channel Width (feet) 10 feet 10 feet Channel Roughness Manning’s n 0.030 0.030 Channel Slope (ft/ft) 0.02 0.005 Critical Depth (feet) Normal Depth (feet) Reach type (Mild, Critical, Steep) Conjugate to Normal Depth (feet) (a) (1 point) Fill in the missing entries in the last four rows of the above table. (b) (1 point) Does the hydraulic jump appear on the upstream (“A”) or downstream (“B” reach? Justify your answer. (c) (1 point) Using normal depths as the upstream (entrance) and downstream (exit) conditions, sketch the flow profile through the two reaches. Label all profiles and indicate all key depths.

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