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

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

Complete design of dewatering system consists of the diameter and spacing of well points or wells, penetration of wells and the pumping capacities.

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

Using the formula, hW = h -Z

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

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

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 seepage analysis is done on the assumptions that the flow is laminar and Darcy’s law is valid and further assumed that the soil to be dewatered is homogeneous and isotropic.

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.