Hydrogeological Characteristics and Groundwater Quality Analysis for Selected Boreholes in Ogbaru Local Government Area, Anambra State, Nigeria.
The extent and distribution hydrogeological and groundwater resources in parts of Anambra State, Nigeria was investigated. The hydrogeophysical and hydrochemical analysis of the shallow wells around Ogbaru in Anambra state was carried out to delineate the geologic layer constituting the aquifer, its suitability or otherwise as source of potable / drinking water and the tendency of the overburden to naturally protect the aquifer. The results show that the study area is majorly underlain by the Alluvial Plain Sands formation. Four different lithologic layers exist in the formation; laterite sandstone, clayey sand, sandstone and saturated sandstone, with varying water storage and yielding capacities. Boreholes depths within the Alluvial Plain Sands are shallow (10-50m) yet the sands are excellent aquifers with high yields (53.8-136.6m3/d) especially along the Ogbaru L.G.A. axis. The result of the analysis showed that most of the physio-chemical and microbiological parameters are within the Nigeria standard for drinking water quality (NSDWQ) permissible limits.
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