A rectangular channel with bed width of 3 m and slope 0.02% carries a discharge of 20 m/s. Surface of the OCF has Manning's roughness coefficient as n=0.02 s/m/3. At one point there is localized narrowing that decreases the width to 2 m. Determine the water depths at the narrow point and at stations just up and downstream of the contracted section, if the channel bed in the contracted section is: (a) the same as the main channel;

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A rectangular channel with bed width of 3 m and slope 0.02% carries a discharge of 20 m/s.
Surface of the OCF has Manning's roughness coefficient as n=0.02 s/m/3. At one point there is a
localized narrowing that decreases the width to 2 m. Determine the water depths at the narrow
point and at stations just up and downstream of the contracted section, if the channel bed in the
contracted section is:
(a) the same as the main channel;
(b) raised by 0.75 m;
(c) lowered by 0.75 m.
You may assume no hydraulic jump occurs immediately downstream of the narrow section.
Transcribed Image Text:A rectangular channel with bed width of 3 m and slope 0.02% carries a discharge of 20 m/s. Surface of the OCF has Manning's roughness coefficient as n=0.02 s/m/3. At one point there is a localized narrowing that decreases the width to 2 m. Determine the water depths at the narrow point and at stations just up and downstream of the contracted section, if the channel bed in the contracted section is: (a) the same as the main channel; (b) raised by 0.75 m; (c) lowered by 0.75 m. You may assume no hydraulic jump occurs immediately downstream of the narrow section.
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