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Backward erosion piping takes place when the phreatic line cuts the downstream face of the dam and seepage pressure is high.

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+1 vote
in Irrigation Engineering by (75.2k points)
Backward erosion piping takes place when the phreatic line cuts the downstream face of the dam and seepage pressure is high.

(a) True

(b) False

I got this question in exam.

The above asked question is from Seepage Theories in section Seepage Theories and Weirs and Barrages Design of Irrigation Engineering

1 Answer

0 votes
by (106k points)
Correct choice is (a) True

To explain: Backward erosion piping is an important failure mechanism for water-retaining structure and local disruption of the downstream top layer leads to concentrated seepage flow. This results in erosion that continues in the upward direction. It is ensured that the phreatic lines never touch the downstream side of the earth dam to avoid failure.

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