Question

Which of the following statement is incorrect regarding the selection of dam site?

(a) For economy, the length of the dam should be as small as possible

(b) For a given height, it should store the maximum volume of water

(c) The river valley at the dam site should be narrow but should open out upstream to provide a large basin for a reservoir

(d) The general bed level at the dam site should preferably be lower than that of the river basin

I have been asked this question during an online exam.

Asked question is from Factors Governing the Selection of a Particular Type of Dam in section General and Particular Dams of Irrigation Engineering

Answer 1

Correct option is (d) The general bed level at the dam site should preferably be lower than that of the river basin

To elaborate: The general B.L should preferably be higher than that of the river basin which facilitates drainage problem and will reduce the height of the dam. The water storage should be largest for the minimum possible height and length and site should be located in a narrow valley.