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

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

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.

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.

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

In 1956, chapmen developed an expression for finding the discharge qP from a partially penetrating slot in an unconfined aquifer from his model studies.

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

Fully penetrating slot is used for both confined and unconfined case of flow.

Where the dewatering system consists of a number of closely spaced well points or wells a simplified solution can be obtained by considering the lines of wells equivalent to a linear drainage slot.