A rectangular channel will be most economical when the flow depth and bottom width are in ratio

Q. A rectangular channel will be most economical when the flow depth and bottom width are in ratio

A

2:1

B

1:1

C

1:2

D

1:4

Solution:

A rectangular channel section is the most economical when either the depth of flow is equal to half the bottom width or hydraulic radius is equal to half the depth of flow ie, the ratio is 1:2

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