Abstract
Hydrogeophysical investigation of the area around Angware and its environs was carried out. It is about 25km2and lies between latitudes 10000’N and 9058’N and longitudes 9005’E and 9008’E. Schlumberger resistivity configuration method was used and interpreted with IP2Win 2.1 program. Geologically is underlain by Precambrian Basement complex(600±150Ma) and Mesozoic Younger Granites(130-150Ma). Computer aided results showed that the area is characterized by seven curve-types (A,H,Q,HA,QH,KA and QK) and 3,4 and 5 geo-electric layers with resistivity range and thickness of 100-692Ωm,1.4-51m; 15.7-1300Ωm,0.9-84m; and 72-504Ωm,0.9-36m respectively. The aquiferous zone revealed by the results is weathered/fractured Basement at a depth between 10-35m and resistivity range from 18-107Ωm, drilling depth of 20-45m is recommended for maximum yields.Keywords: Hydro Geophysical, Angware, Aquifer, Geo-Electric
Highlights
The nature of groundwater occurrence and distribution in typical Basement terrains is more complex due to the discontinuous pattern of crystalline aquifers
Ground water development in areas of crystalline rocks depends on the climatic factors such as temperature, rainfall, humidity, relief and vegetation (Offodile, 2002)
Vertical electrical sounding conducted in about thirty points was interpreted to establish the control of hydrogeophysics on the occurrence and distribution of groundwater in Angware area
Summary
The nature of groundwater occurrence and distribution in typical Basement terrains is more complex due to the discontinuous pattern of crystalline aquifers. Successful groundwater development in such areas requires a quantitative knowledge of the hydrogeophysical parameters of the hydro-geologic units as well as the superficial materials overlying the crystalline rocks and the bedrock structures/relief, (Omosuyi et al, 2003; Olorunfemi et al, 1999 and Jeff, 2006). In this study a detailed hydrogeophysical investigation of Angware and environs was carried out with a view of determining the geo-electric parameters (layer resistivity, thickness and aquifer potentials) of the superficial/overburden materials overlying the bedrock, the subsurface structural disposition of the bedrock and their hydrogeologic characteristics. The nature of the regolith materials overlying the bed rock in the study area is very influential in defining the groundwater potentials of the area.
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