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The length of horizontal blanket should be equal...

The length of horizontal blanket should be equal to _________________

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asked Sep 5, 2023 in Irrigation Engineering by Carter (75.2k points)

The length of horizontal blanket should be equal to _________________

(a) 3 times the height of the dam

(b) 4 times the height of the dam

(c) 5 times the height of the dam

(d) 6 times the height of the dam

The question was posed to me in a dream while sleeping

This intriguing question comes from Rock Fill Dams in section Earthen and Rock Fill Dams of Irrigation Engineering

irrigation engineering
earthen and rock fill dams
rock fill dams

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1 Answer

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answered Sep 16, 2023 by Greg (106k points)

The correct answer is (a) 3 times the height of the dam

For explanation I would say: Blanket is a layer of impervious material laid at a natural ground level extending from the d/s end of the toe. A sufficient length equal to 3 times the height of the dam is provided as per the filter criteria to reduce the seepage pressure.

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