3. Water is flowing uniformly with flow rate 18.6 m3/s and water depth 1.2 m in a rectangular open channel of width 8 m. A temporary short span bridge is proposed to be constructed across the channel in which bridge embankment is needed at both sides of the channel causing the channel to be constricted under the proposed bridge. (i) Calculate the maximum channel width under the proposed bridge that will not cause backwater upstream. (ii) If the channel width under the proposed bridge is 4 m due to the unvoidable problem condition, calculate the expected flow depth under the bridge, at just upstream and at just downstream of the bridge. (iii) If the water depth just upstream of the proposed bridge is limited to be 0.2 m higher than the normal depth, calculate the channel width under the bridge.
3. Water is flowing uniformly with flow rate 18.6 m3/s and water depth 1.2 m in a rectangular open channel of width 8 m. A temporary short span bridge is proposed to be constructed across the channel in which bridge embankment is needed at both sides of the channel causing the channel to be constricted under the proposed bridge.
(i) Calculate the maximum channel width under the proposed bridge that
will not cause backwater upstream.
(ii) If the channel width under the proposed bridge is 4 m due to the
unvoidable problem condition, calculate the expected flow depth under
the bridge, at just upstream and at just downstream of the bridge.
(iii) If the water depth just upstream of the proposed bridge is limited to be
0.2 m higher than the normal depth, calculate the channel width under
the bridge.
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