Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 16, Problem 18P
To determine
The minimum depth required for channel and to mention whether the flow is supercritical or subcriticalfor a trapezoidal channel.
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Water is flowing uniformly with a discharge of 22.6 m³/s and flow depth of 2.3 m in a rectangular open channel of width 4 m. At one section, the channel is to be constricted. If the channel width at constriction is 2.8 m, calculate the flow depth at the constriction and also the alternate depths. Meanwhile, what will happen if the channel width at constriction is 3.6 m? Determine the flow depths at just upstream and downstream of the constriction as well as the flow depth at the constriction section.
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PROBLEM 6
Water in a 6-m-wide rectangular channel flows at a rate of 4 m³/s at a depth of 0.6 m.
(a) What is the velocity (m/s) of flow upstream of the hump?
(b) Is the flow (0.6 m-depth) super-critical or sub-critical? Compute the Froude number.
(c) What is the critical depth, Y. (m)?
(d) What should be the height, YH (m), of the hump to be installed if we want critical depth to occur?
Yc
0.6 m
HUMP
Profile of channel
YH
Water in a 6-m-wide rectangular channel flows at a rate of 4 m³/s at a depth of 0.6 m.
(a) What is the velocity (m/s) of flow upstream of the hump?
(b) Is the flow (0.6 m-depth) super-critical or sub-critical? Compute the Froude number.
(c) What is the critical depth, Yc (m)?
(d) What should be the height, YH (m), of the hump to be installed if we want critical depth to occur?
Yc
0.6 m
HUMP
Profile of channel
YH
Chapter 16 Solutions
Traffic and Highway Engineering
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