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.