A flood occurs in main channel having a trapezoidal section (side slope on both sides: (2H to 1V) and base width of 12m. The depth of the flow in this section is 3.60m and flood spills out over an almost horizontal plane on one side of the main channel. The width of the flood plain is 60m with an overflow depth of 1m. If n=0.025 for the main channel and two times as large for the overflow section. Use the slope=0.00030 for both. Determine the equivalent roughness coefficient.
A flood occurs in main channel having a trapezoidal section (side slope on both sides: (2H to 1V) and base width of 12m. The depth of the flow in this section is 3.60m and flood spills out over an almost horizontal plane on one side of the main channel. The width of the flood plain is 60m with an overflow depth of 1m. If n=0.025 for the main channel and two times as large for the overflow section. Use the slope=0.00030 for both. Determine the equivalent roughness coefficient.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A flood occurs in main channel having a trapezoidal section (side slope on both sides: (2H to 1V) and base width of 12m. The depth of the flow in this section
is 3.60m and flood spills out over an almost horizontal plane on one side of the main channel. The width of the flood plain is 60m with an overflow depth of
1m. If n=0.025 for the main channel and two times as large for the overflow section. Use the slope=0.00030 for both. Determine the equivalent roughness
coefficient.
Main channel, n = 0.025
Flood plane, n = 0.05
1m
3.6m
2.6m
7.2m
12m
5.2m
60m
A
0.035
0.029
0.026
D
0.032
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