The U.S. bureau of Reclamation (Earth Manual, 1960) has devised two types of pumping-in test.

Since the flow of water is not horizontal near wall and the flow no longer remains laminar. Thus, Darcy’s law equation is not valid near the well face.

By pumping test method, the value of storage coefficient ranges was found to be in between 0.00005 to 0.005.

Pumping-out test is the frequently used field method, as it involves discharging water from the ground.

If the well is open, radial flow takes place all around the well and there is no flow from the bottom of the well.

A partially penetrating artesian well is the one in which the well screen does not penetrate to the full depth of the confined aquifer. Such wells extend only partly through the water bearing stratum.

K/A is known as the specific yield or specific capacity of an open well, in cubic meter per hour per square meter of the area through which water percolates.

The parabolic depression formed when water is pumped from the aquifer through well can be called as cone of depression or the drawdown surface.

When two wells are discharged, their drawdown curves intersect within their radii of zero drawdown. Thus the total discharge is increased.

Since specific yield is the volume of water drained, the drainage of water depend on grain size, shape and compaction of stratum in the soil.