5.2.3. Calculation of well loss and aquifer loss coefficient
The average loss coefficients aquifer has been calculated for the four
steps in the respectively for Well No. 4 and Well No. 2
41.45min/m2, 41.64 min/m2, whereas
the average well loss coefficients C has been also calculated on
four-step for Well No. 4 and Well No. 2 42.85 min/m5and 50min/m5, respectively (Table 3 and Fig. 6). On
the basis of Walton’s classification (Nahin et al., 2019; Walton, 1962)
of well loss coefficient and the values between the coefficient and
conditions of wells, the two wells have tested for this investigation
area that is properly developed and designed. However, the percentages
of formation loss have found on average 98.95% (Well No. 4) and 99.42
(Well No. 2), respectively (Table 3). It has indicated that the larger
distance of the pump intake between the screens has increased the
entrance of velocity and hence the water to the well has been indicated
its frictional resistance. It has evaluated by results that all of the
wells exhibited higher loss formation percentages compared between the
well loss percentages of the average well efficiencies (Table 3). This
has been explained by the facts of the two wells that make the aquifer
streaming of flow in the aquifer and it is predominantly laminar of the
turbulent flow on the well efficiencies between the well face and the
aquifer area. The studied results also show that when the well losses
lower with well of aquifer efficiencies, the higher percentage of
reduction has found in the specific capacity that is generally low;
conversely, wells showing higher substances of step drawdown because of
the well losses exhibits relatively higher.