Question

Which foundation suggests the adoption of an earth dam or very low gravity dam?

(a) Solid rock foundation

(b) Gravel foundation

(c) Silt and fine sand foundation

(d) Clay foundation

The question was posed to me in quiz.

This is a very interesting question from Factors Governing the Selection of a Particular Type of Dam topic in division General and Particular Dams of Irrigation Engineering

Answer 1

Correct option is (c) Silt and fine sand foundation

For explanation I would say: Silt and fine sand foundation suggest the adoption of earth dams or low gravity dams up to a height of 8 m and a rock-fill dam is not suitable on such foundation. Seepage and settlement through such foundation may be excessive and must be properly designed to avoid dangers