Question: An earthen dam is constructed from a soil with a compacted saturated unit weight of 2 0 kN / m 3 . There is a

An earthen dam is constructed from a soil with a compacted saturated unit weight of 20 kN/m3. There is a difference in total head of 3 m between the upstream and downstream side of the dam. The flownet for the dam has a total of 8 equipotential drops and the mean length of the smallest square in the flownet is 0.9 m. Taking the unit weight of water =9.81 kN/m3, the factor of safety against piping due to boiling is closest to

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