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UPSC Civil Service Exam Questions

Q1: The base width of a soil gravity dam is 25 m. The material of the dam has a specific gravity of 2.56 and the dam is designed as an elementary profile ignoring uplift. What is the approximate allowable height of the dam ?

A 64 m

B 40 m

C 164 m

D 80 m

ANS:B - 40 m

For an elementary profile of the dam,
The base width of the dam is given by:
B = H/√(Sc-C).

When uplift is ignored, C =0.

B = H/√(Sc).
Where, Sc = 2.56, B = 25.
H = B*√(Sc) = 25*√2.56 = 40 m.



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