4.2.4. Specific capacity
The quantity of water is considered as the specific capacity (Sc) and it is calculated by per unit of drawdown in the well. The yield per unit drawdown has represented simply by it. A stable pumping level has marked it. When recharge has balanced to the discharge, it has established. The parameter of calculation has followed in such equations:
\(S_{c}\)=\(\left(\frac{Q}{S_{w}}\right)\) (4)
Where,
Sc= specific capacity (L3/T-1/L; m3/day/m)
Q= discharge or pumping rate (L3/T; m3/day)
Sw= total or steady drawdown in the pumping well (L; m)
The data of specific capacity has frequently used so that it frequently is estimated the transmissivity of aquifer transmissivity in place (Fetter, 2018; Rajmohan & Elango, 2004; Razack & Huntley, 1991). Moreover, it is more expensive to regulate the total performance of aquifer tests. Although the data and equations have applied to identify the transmissivity with its inherent limitations and errors as potential (Gahala, 2015). Partial penetration of well, well loss and hydrogeological boundaries, values of transmissibility that have been calculated from specific capacity data by underestimate of actual values effect on the pumping tests unfavorably (Misstear & Beeson, 2000).