4.1.1. Drilling
For the drilling construction of wells, 30′′ (Well No. 4) and 22′′ (Well No. 2) temporary casing up to 3m was installed. Soil sample for bore log preparation was collected from each 3m interval, all drilling pipes were measured, marked with red tape as an indication of soil sample collection time. These wells cutting were started on December 07, 2019 and October 20, 2019, respectively. The used drills were 12”cutters and drilling procedure was conducted by Kazal Enterprise. 35 KW generator was used for power supply, 7.5 HP pump for circulating of water, semi-mechanical rotary drilling machine with 10-ton lifting capacity and 2.5inch dia drilling pipes were used. The used drilling fluids were local mud and bentonite. All collected soil samples were properly washed and stored after marking the depth. The bore log format was observed by AAN hydrogeologist and technical supervisor by checking of collecting soil samples. For Well No. 2, 1st cutting reached 237.80m and found continuous fine to medium sand layer from 189.02m - 237.80m whereas the Well No. 4, 1st cutting reached 243.90m and found the continuous medium to fine sand layer from 204.27m - 243.90m. The water-bearing zone identification or simulation was developed by MATLAB (version 16) and it is modified by Adobe Photoshop (version Ps 17).