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A rock toe and a horizontal filter is provided on...

A rock toe and a horizontal filter is provided on the downstream base of an earthen dam in order to _________________

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asked Nov 9, 2023 in Irrigation Engineering by Carter (75.2k points)

A rock toe and a horizontal filter is provided on the downstream base of an earthen dam in order to _________________

(a) prevent piping action in the dam body

(b) prevent piping action in the dam foundation

(c) reduce the seepage quantity by blocking its flow

(d) collect and drain out the seepage flow

I got this question by my college director while I was bunking the class.

This interesting question is from Rock Fill Dams in portion 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 Nov 16, 2023 by Greg (106k points)

Correct option is (d) collect and drain out the seepage flow

Best explanation: Such provision reduces the pore pressure in the downstream portion of the dam and thus increases the stability of the dam permitting steep slopes. The seepage is collected through these drains and moved to a point where it can be safely discharged.

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