+1 vote
in Irrigation Engineering by (74.4k points)
The blanket in earth dam is provided ___________________

(a) at the ground level on u/s side

(b) at the ground level on the d/s side

(c) at the ground level of the D/s side of the dam

(d) on the D/s slope

I had been asked this question in unit test.

Query is from Types of Earthen Dams topic in section Earthen and Rock Fill Dams of Irrigation Engineering

1 Answer

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by (102k points)
Correct answer is (a) at the ground level on u/s side

Easiest explanation: A blanket of relatively impervious material may be placed on the upstream face. Since homogenous earth dam poses the problems of seepage, a homogenous section is generally added with an internal drainage system. This keeps the seepage line well within the body of the dam.

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