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The only spillway among the following through which the discharge does not increase as fast as it increases in all others is _________________

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in Irrigation Engineering by (75.2k points)
The only spillway among the following through which the discharge does not increase as fast as it increases in all others is _________________

(a) chute spillway

(b) side-channel spillway

(c) ogee spillway

(d) shaft spillway

The question was asked during an online exam.

Query is from Shaft Spillway topic in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

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by (106k points)
The correct answer is (d) shaft spillway

Easy explanation: A shaft spillway is generally adopted when the possibility of an overflow spillway and a trough spillway has been ruled out. The discharge does not increase at such a high rate as in weir type spills. Hence, it may not prove as useful as a weir type spills if unestimated high floods occur.

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