Recent Investigation on Hydrogeology of the Basin Granitoids in the Sekyere South District of Ashanti Region, Ghana

Recent Investigation on Hydrogeology of the Basin Granitoids in the Sekyere South District of Ashanti Region, Ghana

Water shortages are faced by communities in the Sekyere South District of the Ashanti Region of Ghana since most of the current water supply systems are predominantly dependent on ephemeral surface water supplies that are fed by rainfall but not distributed uniformly throughout the year. The hydrogeology of the Basin Granitoids has been evaluated using the geophysical technique of electrical resistivity imaging (ERI) and pumping test study in the Sekyere South District of the Ashanti Region of Ghana. The ERI was carried out to obtain information on the distribution of resistivity for groundwater deposition, and the pumping test was used to obtain boreholes’ transmissivity and sustainable yields. ERI findings indicate that the general distribution of resistivity in the region is between (20 – 4000) Ω -m and the resistivity range associated with the occurrence of groundwater is between (50 – 300) Ω -m for the weathered rocks and (100 – 600) Ω -m for the fractured granitic rocks. The aquifers are typically shallow to medium depth and high yields are likely to be achieved where the resistivities of the aquifer zones are less than 400 Ω -m in the fresh granites. The pumping test also revealed that transmissivity values range from (5.89 to 43) m2/day, ranging from 50 to 380 m3/day with sustainable yields. These findings indicate that for domestic supplies, boreholes in the region would be sustainable. Transmissivity values obtained suggest that the boreholes in the area can be used for individual homes and small town water supply systems for domestic purposes. The findings from this study could serve as a guide to groundwater exploration and related geology in the region of the Granitoids.

Author(s) Details

A. Ewusi
Geological Engineering Department, University of Mines and Technology, Tarkwa, Ghana.

J. Seidu
Geological Engineering Department, University of Mines and Technology, Tarkwa, Ghana.

View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/358

Editor 251News

leave a comment

Create Account



Log In Your Account