9. A concrete dam (Fig below) is constructed across a river over a permeable stratum of soil of limited thickness. The water heads are upstream side 16m and 2 m on the downstream side. The flow net constructed under the dam gives is given as below. What is the value of Nf and Nd?
Calculate the seepage loss through the subsoil if the average value of the hydraulic conductivity is 6 x 10-3 cm/sec horizontally and 3 x 10-4 cm/ sec vertically.