Q1
Sketch a flow net for the situation shown in Figure 8.7, and calculate the total discharge. Compare the result with the estimate made at the end of that chapter.
Q2
A building pit in a lake is being constructed, using a sheet pile wall surrounding the building pit. Inside the wall the water level is lowered (by pumping) to the level of the ground surface. Outside the sheet pile wall the water level is 5 m higher. It has been installed to a depth of 10 m below ground surface. The thickness of the soil layer is 20 m. Sketch a flow net, and determine the maximum gradient inside the sheet pile wall.