Question

During which condition, permeability of rocks have to be given more importance?

(a) When general water is much above the top reservoir level

(b) When general water table is much below the minimum water level

(c) When general water table and top water level of the proposed reservoir are almost same

(d) When general water table is slightly above the top reservoir level

This question was posed to me in an online interview.

This interesting question is from Geological Investigations and Silting in chapter Dams and Reservoirs of Engineering Geology

Answer 1

Right choice is (b) When general water table is much below the minimum water level

The best I can explain: When the general water table is much below the minimum water level in the reservoir, permeability of the rocks along the base and the flanks is taken into consideration.