(b) A half trapezoid flood drainage channel (Fig. 3b) has a flow of 100 m³/s. If the flow depth upstream of the 0.2 m step-rise is 4 m, what is the depth at an immediately downstream section of the 0.2 m step- rise? Assume there are no losses in the transition. Also compute the flow depth at the a very far downstream end if the flood drainage channel ends in a free overfall. (c) For a symmetrical compound channel section (Fig. 3c), compute the ne, a, and S, based on the assumption that the depth of flow in the section is 5 m; the flood plains and the main channel have the same bottom slope of 0.001; and roughness coefficient for the main channel and the flood floodplains are respectively 0.021 and 0.039.
(b) A half trapezoid flood drainage channel (Fig. 3b) has a flow of 100 m³/s. If the flow depth upstream of the 0.2 m step-rise is 4 m, what is the depth at an immediately downstream section of the 0.2 m step- rise? Assume there are no losses in the transition. Also compute the flow depth at the a very far downstream end if the flood drainage channel ends in a free overfall. (c) For a symmetrical compound channel section (Fig. 3c), compute the ne, a, and S, based on the assumption that the depth of flow in the section is 5 m; the flood plains and the main channel have the same bottom slope of 0.001; and roughness coefficient for the main channel and the flood floodplains are respectively 0.021 and 0.039.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:(b) A half trapezoid flood drainage channel (Fig. 3b) has a flow of 100 m³/s. If the flow depth upstream
of the 0.2 m step-rise is 4 m, what is the depth at an immediately downstream section of the 0.2 m step-
rise? Assume there are no losses in the transition. Also compute the flow depth at the a very far
downstream end if the flood drainage channel ends in a free overfall.
(c) For a symmetrical compound channel section (Fig. 3c), compute the ne, a, and S, based on the
assumption that the depth of flow in the section is 5 m; the flood plains and the main channel have the same
bottom slope of 0.001; and roughness coefficient for the main channel and the flood floodplains are
respectively 0.021 and 0.039.
Transcribed Image Text:40m
12/2
1
5m->
2
Q=140 m³/s
L
0.2 m
Figure 3b
4m
20 m-
Figure 3c
Ус
-5m
4
²
2
10 m
sid
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