5.2.3. The calculation of specific capacity and aquifer transmissivity
From Table 3 it has apparent that Q/Sw max is considered as the specific capacity of average the step-down test for the two wells, and that the specific capacity is proportional to increasing well loss inversely. The calculation of specific capacity has found 21.81 m3/day/m and 20.56 m3/day/m at wells Well No. 4 and Well No. 2, respectively. These values have reflected the lower pumping water levels and, hence it makes the costs of pumping also lower.
The values of transmissivity have calculated from the specific-capacity data 271.24(m2/day) and 263.3(m2/day) for Well No. 4 and Well No. 2, respectively (Table 3). These values have reflected very good productivity of aquifer (higher yields) and high amount of groundwater accessibility by the pumping wells. There are found smaller differences of transmissivity between two wells and these wells are found in the same sedimentary facies in different thicknesses and same water-bearing bed. It has mentioned that values transmissivity has calculated by specific capacity data and it has been evaluated by the actual (true) values. Therefore, partially penetrating production well, the quantity of well loss and the presence of hydro-geologic boundaries has affected.