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 sectionis 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 of1m. 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 roughnesscoefficient.Main channel, n = 0.025Flood plane, n = 0.051m3.6m2.6m7.2m12m5.2m60mA0.0350.0290.026D0.032

data given Main channel as trapezoidal section with [2V:1H] depth of flow = 3.60 m Base width = 12m…

Answered: d two times as large for the overflow…

d two times as large for the overflow section. Use the slope=0.00030 for both. Determine the equivalent roughne: annel, n = 0.025 Flood plane, n = 0.05

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

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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