*1.2.4 Specific capacity*

Specific capacity is known as well performance test estimated by assuming the well is pumped at a constant rate long enough to establish the equilibrium drawdown; within the well, there is a combination of the decrease in hydraulic head (pressure) and a pressure loss due to well loss. Specific capacity is defined as:

$$\mathbf{Sc} = \mathbf{Q} / \text{TDD}\_{\mathbf{w}} \tag{3}$$

where Sc is specific capacity, Q is the pumping rate, and TDDw is the total drawdown in the well due to both aquifer drawdown and well loss.

Well loss is created by the turbulent flow of water through the well screen and into the pump intake. Specific capacity is estimated by discharge on a linear x-axis and drawdown on a linear y-axis and measuring the slope of the straight line fit.
