Multiple choice

The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are: permeability coefficient = 0.09 m/day (isotropic), specific gravity = 2.70 and void ratio = 0.85. The sheet pile wall and the bottom of the soil are impermeable. The seepage loss (in m3 per day per unit length of the wall) of water is

  1. 0.33

  2. 0.38

  3. 0.43

  4. 0.54
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seepage loss q = k * H * (Nf / Nd). From the flow net, Nf = 4 and Nd = 9. k = 0.09 m/day. Assuming H is the head difference, calculate q.

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