Question

For triangular dam section of height H for just no tension under the action of water pressure, self-weight and uplift pressure, the minimum base width required is _____________

(a) H / (S-1)

(b) H / S^1/2

(c) H / (S – 1)^-1

(d) H / (S-1)^1/2

I have been asked this question in an interview for internship.

Question is taken from Gravity Method topic in section Gravity Dam Design and Construction of Irrigation Engineering

Answer 1

Correct option is (d) H / (S-1)^1/2

For explanation: The minimum base width (B) of a gravity dam having an elementary profile –

B = H / (S – 1)^-1 where S is specific gravity of concrete and H is the height of water.

If uplift is not considered – B = H/S^1/2.