Identify the valid assumptions applied in Laplacian equation:
(A) Water is compressible
(B) The soil is incompressible and porous.
(C) The quantity of water entering the soil in any given time is the same as the quantity flowing out of soil.
(D) Darcy's law is valid for the given soil and hydraulic boundary conditions at the entry and exit are known.
Choose the correct answer from the options given below:
Show Hint
The Laplace equation for two-dimensional, steady-state, isotropic flow is:
\[
\frac{\partial^2 h}{\partial x^2} + \frac{\partial^2 h}{\partial z^2} = 0
\]
This equation is solved graphically using flow nets consisting of orthogonal flow lines and equipotential lines.