Specific yield is an indication of the water yielding capacity of an unconfined aquifer.

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.

In the recuperation test, water level can be depressed to any level and the discharge from the well can be calculated.

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

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.

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

For fine-grained type of soil, the value of K/A is 0.25 cubic meter per hour, per sq. m of the area under 1m depression head.

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.

The analysis of the radial flow of water to a well was originally proposed by Dupuit’s theory.