Abstract
Kabatini area is in Nakuru County which occurs in Kenya within the great Gregory rift valley. The area is bounded by longitudes 180900-181200 and latitudes 9971050-9971200 in UTM. This research aimed to investigate the possible occurrence of subsurface faults recharging Kabatini aquifer which is the primary source of groundwater for the residents of Nakuru town and its environs. Vertical electrical sounding and geological mapping methods were used to unravel this problem of subsurface fault occurrence in the area of study. Vertical Electrical Sounding data collected were analyzed using the computer-based inversion using EarthImager software, which allows the performance of automatic interpretation of the Schlumberger sounding curves to obtain the equivalent n-layer model from the apparent resistivity curve of each sounding. This procedure was used for all the sounding points collected in the study area, to obtain the equivalent apparent resistivity models of each sounding, their depths as well as thicknesses. The results indicate the occurrence of subsurface faults trending in the north-south direction which is proven by K-H-K, K-H-H, Q-H-A, Q-H-Q. Depth iso-resistivity analysis shows that the fault plane is deeper than 165 meters below the surface.
Highlights
In the recent past, the water supply in Nakuru municipality, located within the Nakuru basin, has been characterized by chronic shortages affecting mainly residential and industrial functions
Kabatini area which is located in the northeastern part of Nakuru municipality is characterized by complex geology which has affected the ground water system
Many questions have come out in regard to the disappearance of this river into the subsurface. It is with this regards that we attempt to investigate the tectonic condition in the area
Summary
The water supply in Nakuru municipality, located within the Nakuru basin, has been characterized by chronic shortages affecting mainly residential and industrial functions. It has never been proved that the river channel passes underground to recharge Kabatini and Baharini aquifer to the south of the study area. Whereas other researchers have worked in the area, none of them has addressed the existence or non - existence of the buried river channels and other shallow underground structures that may be controlling groundwater flow systems. The structures such as faults may form channels through which water flow and recharge the aquifer. The sediments are composed of sand, pebbles as well as gravels made up of rounded pumice
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