Distribution of aquifer characteristics in different geomorphologic units in a granitic terrain
2020
Dhakate, Ratnakar
Knowledge of aquifer characteristics is essential for groundwater development and management studies. Detailed hydrological studies were carried out in a granitic terrain consisting of different geomorphologic units to resolve the coverage, performance, and characteristics of the aquifer parameters through the application of the pumping test method. An interpretation was performed by different methods, viz., Theis, Jacob, Hantush, and Rushton and Redshaw (numerical finite difference method) to ascertain the aquifer parameters. These parameters are vital for future groundwater development and management studies. Transmissivity (T) values estimated by Theis method range from 3.83 to 436 m²/day; 3.77 to 718 m²/day; and 16 to 160 m²/day, by Jacob method it ranges from 3.90 to 436 m²/day; 3.73 to 769 m²/day; and 17.3 to 152 m²/day, by Hantush method it ranges from 1.63 to 189 m²/day; 0.53 to 755 m²/day; and 19.3 to 118 m²/day, while by numerical method it ranges from 3 to 455 m²/day, 3 to 700 m²/day, and 17 to 148 m²/day in pediplain with moderate weathering (PPM), pediplain with shallow weathering (PPS), and buried pediplain with shallow weathering (BPPS) geomorphologic units, respectively. Similarly, a radius of influences ranges from 9.75 to 1391.0 m; 8.0 to 698.09 m, and 380.78 to 433.76 m in PPS, PPM, and BPPS geomorphologic units, respectively. The aquifer parameters obtained by the pumping tests were correlated with the structural features and different geomorphologic units. It was found that these parameters have wide variations within each geomorphologic feature. The radius of influence of each test well was calculated and compared with the in situ measured discharge of various wells within the area. The high values of transmissivity (T) are attributed to aquifer controlled by fractured zone in the area.
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