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.