(Solved): Two temporary sheet pile wall systems were constructed, as shown in Figure 1, to build an underwate ...

Two temporary sheet pile wall systems were constructed, as shown in Figure 1, to build an underwater foundation. The soil was excavated to a depth \( \mathrm{D}=5 \mathrm{~m} \). The water level in the backside of the sheet piles is \( \mathrm{H}=4 \mathrm{~m} \). The corresponding flow net for this problem is also shown in the figure, Assume the flow net is correct, determine: a) The rate the water was being pumped out of the excavation area per unit width to maintain the water level shown (i.e., the rate of seepage flow, q, into the excavated area), b) The total head, porewater pressure, and the rise in water in the standpipe at points \( \mathrm{A} \) and \( \mathrm{B} \). c) The total and effective vertical stresses at points A and B. d) The hydraulic gradient at point \( \mathrm{C} \).