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 2 problems to solve. Do not turn in solutions for more than 2 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: Select the radius of a semi‐circular open channel section made of concrete (use f=0.026) that will transport 5 m3/s of water (ambient temperature) so that the head loss in a 300‐m long horizontal section does not exceed 20 m. Verify the value of the friction factor f using the Colebrook equation with ε = 3 mm. Problem 2: A trapezoidal open channel with 1.5:1 H:V side slopes and 3 m bottom width carries 15 m3/s of water at a uniform depth of 1.7 m. The Manning roughness coefficient is n=0.022. Determine: a) The channel slope b) Is the flow subcritical, or supercritical? c) If the water depth in the discharge point is 1.0 m, what is the flow rate carried by the open channel ? Problem 3: A rectangular open channel with a width of 3 m carries 5.5 m3/s of water at a depth of 1.8 m. If an obstruction 30 cm high and 30 cm wide is placed across the channel, calculate the elevation of the water surface over the obstruction. ...
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- Spring '09
- Florida International University, Water Resources Engineering, trapezoidal open channel, Open Channel, FIU Honor Code., semi‐circular open channel