Abstract
The Ebonyi State Police Headquarters, Abakaliki is within the area underlain by the pyroclastic rocks that are generally known to have low prospect for groundwater. Yet, a borehole with sustainable yield was required to supply part of the increased population of the barracks through a newly constructed 40,000 litres capacity overhead tank Modified borehole design and yield enhancement procedure along with pre- drilling electrical resistivity survey were used to achieve sustained yield of 1500 litres per hour from a motorized borehole. KEY WORDS: Pyroclastic rocks; borehole design; sustainable yield. Global Journal of Geological Sciences Vol.2(2) 2004: 183-190
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