Unformatted text preview: Florida International University Department of Civil and Environmental Engineering CWR3103 – Water Resources Engineering Final Examination This is an open book, open notes examination. It is subject to FIU Honor Code. Please follow these general instructions: 1. Choose 3 problems to solve. Do not turn in solutions for more than 3 problems. 2. Show all work and equations used. 3. Explain clearly your calculation steps. 4. Write answers legibly. 5. Sign the pledge below. 6. Return this exam sheet with your solution to Dr. Miralles before you leave the classroom. No sheets will be accepted afterwards. I, undersigned, pledge my honor that I have neither given nor received aid on this examination. Signature:________________________________________________ Printed name:_____________________________________________ Problem 1: Water is flowing uniformly in an open triangular channel at a rate of 14 m3/s. The channel has 1:1 side slopes and a roughness coefficient of n = 0.012. Determine whether the flow is subcritical or supercritical if the bottom slope is 0.006. 1 y 1 Problem 2: A trapezoidal channel with dimensions shown in the figure below is laid on a slope of 0.001 ft/ft. The Manning’s value for this channel is 0.025 and the rate of flow through the channel is 1000 cfs. Note: At the point of free outfall, the flow will pass through critical depth (see the right hand side of the figure below). At the left hand side the flow will be subcritical. Calculate the normal depth that will be developed upstream, yn. T 1
1.5
20' Crossection yn
Q
yc Distance from the outfall 0 Problem 3: Water flows in a 8‐m wide rectangular channel that has a longitudinal slope of 0.0001. The channel has an equivalent sand roughness of 2 mm. Calculate the uniform flow depth in the channel when the flow rate is 15 m3/s. Use the Darcy‐Weisbach equation. Problem 4: A rectangular channel 3 m wide carries 4 m3/s of water at a depth of 1.5 m. If an obstruction 15 cm high is placed across the channel, calculate the elevation of the water surface over the obstruction. What is the maximum height of the obstruction that will not cause a rise in the water surface upstream? ...
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 Spring '09
 Miralles
 Florida International University, Water Resources Engineering, wide rectangular channel, FIU Honor Code., open triangular channel, Write answers legibly.

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