Extracted text: Problem (3) The flow net for water seepage is shown in the figure below, where the permeable soil layer has a saturated unit weight: %a-17.7 kN/m°. Calculate: a) Seepage force per unit volume Sheet pile H = 3 m Heave zone На 0.5 m Ysat = 17.7 kN/m3 rmeable layer Figure 6.9 Flow net for seepage of water around sheet piles driven into permeable layer