Question: If the difference in total head Delta H = 7 . 4 m and the saturated unit weight of the soil is 1 9

If the difference in total head \Delta H =7.4 m and the saturated unit weight of the soil is 19 kN/m3 for the cofferdam shown, the factor of safety against piping (to one decimal place) in the exit cell closest to either sheet pile wall is:
If the difference in total head \ Delta H = 7 . 4

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