A concrete gravity dam having a maximum reservoir level at 200 m and the RL of the bottom of the dam 100 m. The maximum allowable compressive stress in concrete is 3000 KN/m^2 and the specific gravity of concrete is 2.4. Calculate the height of the dam and check whether it is a high dam or low dam.

Question

A concrete gravity dam having a maximum reservoir level at 200 m and the RL of the bottom of the dam 100 m. The maximum allowable compressive stress in concrete is 3000 KN/m^2 and the specific gravity of concrete is 2.4. Calculate the height of the dam and check whether it is a high dam or low dam.

asked Sep 25, 2023 in Irrigation Engineering by Carter (75.2k points)

A concrete gravity dam having a maximum reservoir level at 200 m and the RL of the bottom of the dam 100 m. The maximum allowable compressive stress in concrete is 3000 KN/m^2 and the specific gravity of concrete is 2.4. Calculate the height of the dam and check whether it is a high dam or low dam.

(a) H = 90 m High gravity dam

(b) H = 90 m Low gravity dam

(c) H = 214.2 m High gravity dam

(d) H = 214.2 m Low gravity dam

This question was posed to me during an online interview.

Asked question is from Design of Gravity Dams in division Gravity Dam Design and Construction of Irrigation Engineering

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Greg · Answer 1 · 2023-11-09T09:29:22+0000

Right answer is (a) H = 90 m High gravity dam

Best explanation: The limiting height of the dam is given by-

H = f / ϒw (Sc + 1) where f = allowable stress of dam material = 3000 KN/m^2, Sc = 2.4, and ϒw = 9.81 KN/m^2.

H = 3000 / 9.81 x 3.4 = 89.9 m.

This value is more than the height of the dam so it is a high gravity dam.

A concrete gravity dam having a maximum reservoir level at 200 m and the RL of the bottom of the dam 100 m. The maximum allowable compressive stress in concrete is 3000 KN/m^2 and the specific gravity of concrete is 2.4. Calculate the height of the dam and check whether it is a high dam or low dam.

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