WATER RESOURCES ENGINEERING
WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119490579
Author: Mays
Publisher: WILEY
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Chapter 5, Problem 5.2.2P
To determine

The critical flow depth.

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Question 48 A circular pipe has a diameter of 1m, bed slope of 1 in 1000, and Manning's roughness coefficient equal to 0.01. It may be treated as an open channel flow when it is flowing just full, i.e., the water level just touches the crest. The discharge in this condition is denoted by Qfull- Similarly, the discharge when the pipe is flowing half-full i.e., with a flow depth of 0.5m, is denoted by Qhalf. The ratio Qfull/Qhalf İs:
Water flows in a channel of the shape of isosceles triangle of bed width 'a' and sides making an angle of 45° with the bed. Determine the relation between depth of flow 'd' and the bed width 'a' for maximum velocity and for maximum discharge condition. Use manning's formula and note that 'd' is less than 0.50a.
6.8.11. A diversion gate backs up flow in a 5-ft wide rectangular irrigation channel (So = 0.001, 0.015). The discharge in the channel is 50 cfs. If the depth of flow at the gate is 5 ft, deter- mine the channel and flow classification (e.g., M-2, S-1) upstream of the gate and explain your supporting logic. Then determine the water surface profile by finding the depth of flow at distances of 200 ft, 500 ft, and 1,000 ft upstream of the gate. Use a spreadsheet or appropriate computer software to perform the computations. (See the book's preface for computer software suggestions.) %3D n%3D
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