Assessment of Physicochemical and Bacteriological Parameters of Borehole Water: A Case Study from Lekki, Lagos, Nigeria

doi:10.33140/jsndc.03.01.12

Cited by 2 publications

References 22 publications

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Detection and Delineation of Lateral and Vertical Extent to Fresh-Saline Water Boundary: Recent Development in Badagary Axis of the Dahomey Basin, Nigeria

OJO,

Babafemi,

Jabo

et al. 2024

Preprint

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This research is aimed at detecting evidence of saline water intrusion in the aquifers, delineate the depth to and lateral extent of saline water incursion into the Badagary area of Dahomey Basin, South western Nigeria. This was done by combining information derived from water quality analysis, geophysical well logs, lithologic logs and geophysical field data. Groundwater samples were collected from shallow wells and abandoned deep wells close to the vertical electrical sounding (VES) points. Variations in resistivity of the subsurface downwards were measured from six (6) different points using the VES technique along six traverses that covers about 1 kilometer long. VES data were interpreted using the RES 2D inversion tool Result from water quality test revealed saline water incursion into the aquifers with values of Na+ concentration found to be as low as 76 mg/l in Badagary well 2, a shallow well and as high as 162 mg/l in Badagary well 4, an abandoned deep well. Cl− values range from as low as 257 mg/l in Badagary well 6 and as high as 321 mg/l in well 3, an average of 287.83 mg/l. Na+ and Cl− ions contributing about 70% of the concentration of the cations and the anions. The results of geophysical study revealed that the Badagary axis of Dahomey Basin exhibit a multi-aquifer system having three levels of aquifers as follows: shallow unconfined aquifer unit which exist around 30–40 meters deep at the hinterland, intermediate semi-confined and confined aquifer at about 40–120 meters deep and deeper confined aquifer unit occurring at about 40–150 meters deep or at the coast at about 120–270 meters deep. The aquifers are thick at greater depths towards the coast but thins out at shallower depths around the hinterland except in certain cases where thick sequence of Coastal Plain Sands confines the aquifers at the hinterland. Results from geophysical field data interpretation and lithologic logs indicates saline water incursion especially in areas that borders the Atlantic Ocean. To date, saline water incursion has extended up to about 2,265 meters from the sea shore and about 138 meters deep in boreholes.

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Detection and Delineation of Lateral and Vertical Extent to Fresh-Saline Water Boundary: Recent Development in Badagary Axis of the Dahomey Basin, Nigeria

OJO,

Babafemi,

Jabo

et al. 2024

Preprint

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An Assessment of Saltwater Intrusion in Coastal Regions of Lagos, Nigeria

Callistus,

Daniel,

Pelumi

et al. 2024

GEP

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This paper explains various factors that contribute to saltwater intrusion, including overexploitation of freshwater resources and climate change as well as the different techniques essential for effective saltwater intrusion management. The impact of saltwater intrusion along coastal regions and its impact on the environment, hydrogeology and groundwater contamination. It suggests potential solutions to mitigate the impact of saltwater intrusion, including effective water management and techniques for managing SWI. The application of A.I (assessment index) serves as a guideline to correctly identify wells with SWI ranging from no intrusion, slight intrusion and strong intrusion. The challenges of saltwater intrusion in Lagos and the salinization of wells were investigated using the hydro-chemical parameters. The study identifies four wells ("AA", "CMS", "OBA" and "VIL") as having high electric conductivities, indicating saline water intrusion, while other wells ("EBM", "IKJ, and "IKO") with lower electric conductivities, indicate little or no salt-water intrusion, and "AJ" well shows slight intrusion. The elevation of the wells also played a vital role in the SWI across coastal regions of Lagos. The study recommends continuous monitoring of coastal wells to help sustain and reduce saline intrusion. The findings of the study are important for policymakers, researchers, and practitioners who are interested in addressing the challenges of saltwater intrusion along coastal regions. We assessed the SWI across the eight (8) wells using the Assessment Index to identify wells with SWI. Wells in "CMS" and "VIL" has strong intrusions. A proposed classification system based on specific ion ratios categorizes water quality from good (+) to highly (−) contaminated (refer to Table 4

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Assessment of Physicochemical and Bacteriological Parameters of Borehole Water: A Case Study from Lekki, Lagos, Nigeria

Cited by 2 publications

References 22 publications

Detection and Delineation of Lateral and Vertical Extent to Fresh-Saline Water Boundary: Recent Development in Badagary Axis of the Dahomey Basin, Nigeria

Detection and Delineation of Lateral and Vertical Extent to Fresh-Saline Water Boundary: Recent Development in Badagary Axis of the Dahomey Basin, Nigeria

An Assessment of Saltwater Intrusion in Coastal Regions of Lagos, Nigeria

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