Groundwater exploitation in Awka (Anambra – Nigeria) and environs: prospects, and challenges while drilling and its mitigation measures

Ifeanyi Emmanuel Anyanwu*, Sodiq Oguntade

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Groundwater exploitation (borehole drilling) was carried out around Awka and environs in Anambra State, Southeastern Nigeria, to understand the underlying rock units encountered while drilling, differentiate boreholes with confined aquifers from those with unconfined aquifers, delineate the probable aquiferous zones from the borehole data, evaluate the challenges encountered while drilling (both geologic and technical), and identify mitigation measures employed to address these challenges. Detailed geologic log information of the boreholes was produced to illustrate the rock units encountered while drilling. Four rock units were identified, namely: shale, sandstone, clay, and gravel. These rock units were exposed within the Imo Formation and the Nanka Formation that underlie the study area. Results from the geologic log information of the boreholes indicate that the water table within the study area ranges from 11.2 m to 56.5 m from the soil surface, and the probable aquiferous zones vary from 6.8 m to 23.3 m in thickness. A detailed look at the lithologic logs of the boreholes show that 50% of the drilled boreholes possess confined aquifers while the remaining 50% have unconfined aquifers. A careful appraisal of the challenges encountered, which are mainly geologic, is strictly attributed to the geologic formation of the study area. Other technical challenges have been derived from mechanical faults developed during drilling.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalAcque Sotterranee - Italian Journal of Groundwater
Volume10
Issue number4
DOIs
Publication statusPublished - 23 Dec 2021
Externally publishedYes

ASJC Scopus subject areas

  • Geology

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