Question

The only spillway among the following through which the discharge is almost at its capacity rate even from the start of its functioning is ________________

(a) chute spillway

(b) side-channel spillway

(c) ogee spillway

(d) siphon spillway

I got this question by my college professor while I was bunking the class.

My doubt stems from Shaft Spillway in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

Answer 1

The correct answer is (d) siphon spillway

For explanation: Since the change in the effective head is small as compared to the corresponding change in head over an ogee spillway. When once the water level has risen above the normal pool level, the discharge through the siphon is always at its capacity. This makes it advantageous in disposing of sudden surges of water.