Question

In the functioning of an ogee spillway, the operating head ______________________

(a) frequently exceeds the design head

(b) rarely exceeds the design head

(c) never exceeds the design head

(d) has no connection with the design head

The question was asked in homework.

Enquiry is from Ogee Spillway topic in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

Answer 1

Correct choice is (b) rarely exceeds the design head

For explanation I would say: An ogee spillway is designed for maximum head up to RL of maximum reservoir level; there are almost no chances of operating head exceeding the design head. Under rare emergency as in excessive floods, it may become necessary to allow the reservoir level to go even above the MRL in such case the operating head may exceed the design head.