The electric models suggested by ohm, have the same geometric shape as the soil through which the water flows. And both Darcy and ohm’s law have corresponding analogous quantities.

Dewatering of fine grained cohesive soil can be done only electro-osmosis method.

Based on Dupuit-Forchheimer assumptions, the slope of the drawdown curve was assumed to be equal to hydraulic agent.

Using the formula, hW = h -Z

According to practical suggestion given by A.Casagrande, every transition in the shape of curve is smooth, being either elliptical or parabolic in shape.

ie =Δ h /l, represent gradient formula where Δ h=potential drop and l is the average of last field in the flow net at the exit end.

For fine-grained soils, the well point system can be extended by the vacuum method.

The graphical method of flow net construction first given by Forchheimer in 1930, based on trial sketching.

EA= extra length factor, which is a function of the ratio of slot penetration p to the thickness of pervious stratum b.

The portion between any two successive flow lines is called a flow channel and the portion enclosed between two successive equipotential lines and successive flow lines are known as field.