Question

An ungated spillway starts functioning as soon as the water level in the reservoir crosses the __________________

(a) maximum reservoir level

(b) minimum reservoir level

(c) maximum conservation level

(d) full Supply level

This question was addressed to me in a dream while sleeping

My question is from Location of Spillway in section Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

Answer 1

Right option is (c) maximum conservation level

The explanation is: Maximum conservation level is nothing but normal pool level which is the maximum elevation to which the reservoir water surface will rise during normal operating conditions. This is equivalent to the elevation of the spillway crest or the top of the spillway gates, such uncontrolled spillways are only guided by the available water head.