Question

The siphons installed over overflow dams constitute what are known as __________________

(a) hooded type siphon spillway

(b) tilted outlet type siphon spillway

(c) discharge carriers

(d) baby siphons

This question was posed to me by my college professor while I was bunking the class.

My question is taken from Shaft Spillway topic in division Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

Answer 1

Correct answer is (a) hooded type siphon spillway

For explanation I would say: In hooded type spillway, a reinforced concrete hood is constructed over an ordinary overflow section of a gravity dam. The inlet is kept submerged to prevent the entry of debris, ice, etc. A small de-priming hood is kept above the main hood and they are connected by an air vent.