Question

The cubic meters of water that can be stored in an irrigation tank between full tank level and sill level of the lowest supply sluice is known as __________________

(a) the gross capacity

(b) effective capacity

(c) the specific capacity

(d) total capacity

This question was posed to me in a national level competition.

This key question is from Tank Irrigation in chapter River Navigation & Tank Irrigation of Irrigation Engineering

Answer 1

The correct answer is (b) effective capacity

The best I can explain: The cubic content of water stored in the tank up to F.T.L is called the gross capacity of the tank. The cubic content of water stored between F.T.L and the bottom or sill level of the lowest supply sluice is the effective capacity of the tank. These capacities can be computed by using the contour plan of the area of the water spread.