Let the vertical cross section ABCDA become trapezoidal by raising B vertically in such a way that the elevations of points D and C are 0m , A is 100m, and B is 130m. Let AD, DC, and BC be impermeable and let AB represent a water table of constant slope (on which the hydraulic head equals the elevation).

(a) Draw a quantitatively accurate flow net for this case. Label the equipotential lines with their correct h value.

(b) If the hydraulic conductivity in the region is 10^-4 m/s, calculate the total flow through the system in m^3/s (per meter of thickness perpendicular to the section).

(c) Use Darcy's law to calculate the entrance or exit velocity of flow at each point where a flowline intersects the upper boundary.