The section through a sheet pile wall along a tidal estuary is given in Figure $2.$ At low tide the depth of water in front of the wall is $4\mathrm{.}00m$; the water table behind the wall lags $2\mathrm{.}50m$ behind tidal level.

a$)$ Calculate the flow rate through the section if the permeability of the soil is $1\mathrm{.}2{10}^{-5}c\frac{m}{s}.$

b$)$ Calculate the flow rate through the section by using chart solution.

c$)$ Calculate the water pressure at Point A and B$.$