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

Using the formula, hW = h -Z

The flow lines and equipotential lines always meet at right angles to one another.

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

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

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.

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.

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.

The application of electro-osmosis to dewatering of soil was largely developed by L. Casagrande.