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The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________

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in Irrigation Engineering by (75.2k points)
The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________

(a) (Hd + d) / He is less than 1.7

(b) (Hd + d) / He exceeds 1.7

(c) (Hd + d) / He is equal to 1

(d) (Hd + d) / He is less than 1.33

This question was addressed to me during an interview.

The question is from Ogee Profile in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

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by (106k points)
Correct option is (b) (Hd + d) / He exceeds 1.7

Explanation: The d/s apron is found to have a negligible effect on the coefficient of discharge when the value of (Hd + d) / He exceeds 1.7. where d is the tailwater depth, Hd is the design head and He is the Design head including the velocity head. There can be a decrease in the coefficient due to tailwater submergence.

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