Question

When would the dam become irrelevant?

(a) When the rocks are strong

(b) When the rocks are impermeable

(c) When the rocks are porous

(d) When the rocks are weathered to a certain extent

I have been asked this question in class test.

I would like to ask this question from Engineering Considerations of Groundwater in division Groundwater of Engineering Geology

Answer 1

Right answer is (c) When the rocks are porous

For explanation I would say: A dam is built across a river primarily to store water in the form of a reservoir. The whole idea of a dam would become irrelevant if the foundations on which it is built are made of porous rocks or if a stretch of a reservoir rock is permeable.