PLEASE DO NOT USE AI OR SAME ANSWER FROM SHARED BEFORE QUESTION.!

Given: A dam which has a base width of $100m$ and upstream water depth of $70m$ is built on permeable ground layer that the thickness is $140m.$ A sheet pile extending $80m$ through the permeable soil reduces the seepage. Choose the mesh as $x=y=10m.$

c$)$ Find pressures at points on the cutoff wall.

Governing equation for velocity potential function

$\frac{de{l}^2}{del{x}^2}+\frac{de{l}^2}{del{y}^2}=0$