Hydrogeology of Lagos metropolis

Longe, E. O.; Malomo, S.; Olorunniwo, M.A.

doi:10.1016/0899-5362(87)90058-3

Cited by 81 publications

(72 citation statements)

References 2 publications

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“…This is mostly exploited through hand-dug wells and stand the risk of pollution because of its nearness to the surface and being a water table aquifer (depth of 2.0-15.0 m below the surface) according to Longe et al (1987) and Adepelumi Ako, Ajayi, Afolabi, and Omotoso (2008). This being the case, the hydrocarbon contamination at the study area falls within the first aquifer.…”

Section: Hydrogeologymentioning

confidence: 99%

“…Plethoral of surface water in forms of streams and rivers complement the ocean and lagoon as sources of domestic water for the municipal after treatment. The practice continued untill 1980s when there was increased awareness of the large stock of underground water (Longe, Malomo, & Olorunniwo, 1987).…”

Section: Hydrogeologymentioning

confidence: 99%

“…This being the case, the hydrocarbon contamination at the study area falls within the first aquifer. The second aquifer horizon is made up of sands and clay thought to be the coarse sandy estuarine deltaic and continental beds of Ilaro formation (Jones & Hockey, 1964;Longe et al, 1987), while the third aquifer layer consists of alternating sequences of clayey and sandy strata. The second and third aquifer layer were exempted from the contamination possibly owing to the clay seal, but with time, could be proned to contamination through other processes like faulting and pressure on the overlying strata.…”

Section: Hydrogeologymentioning

confidence: 99%

“…Three aquifer horizons have been delineated under Lagos metropolis subsurface; these are categorized to first aquifer horizon thought to belong to the Recent lithoral/alluvial deposit and the Benin formation (Longe et al, 1987). This is mostly exploited through hand-dug wells and stand the risk of pollution because of its nearness to the surface and being a water table aquifer (depth of 2.0-15.0 m below the surface) according to Longe et al (1987) and Adepelumi Ako, Ajayi, Afolabi, and Omotoso (2008).…”

Section: Hydrogeologymentioning

confidence: 99%

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Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Ayolabi¹,

Folorunso²,

Idem³

2012

ESR

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The subsurface soil around Baruwa community was reportedly contaminated by hydrocarbon not because the area falls within oil-producing community but it suffers from inceasant leakage from petroleum pipeline that supply petroleum products to hydrocarbon terminar located within the area. Thus, to ascretain the extent of contamination of the subsurface soil around the area, an integrated geophysical methods involving vertical electrical sounding (VES) and electrical resistivity tomography (ERT) supported with induced polarization (IP) and spontaneous potential (SP) methods were carried out. The hydrocarbon contaminated layers were marked out beneath each VES point by high resistivity ranging between 943Ωm and 4749Ωm at a depth of 1 to 35.44m below the surface. Similarly, ERT result shows that the subsurface soil around the investigated area has been contaminated at a shallow depth of about 2m downward with resistivity value above 1000Ωm. IP and SP data were Integrated to identify the sandy contaminated layers from clayey layer. IP value of 0 to 10mV/V and SP values of <+10mV were obtained over the sandy formation. The work shows that hydrocarbon leaking from the pipeline laid a few meters beneath the earth surface actually flow both upwardly (possibly due to seasonal variation in the water table which is usually close to the surface during rainy season) to the surface and downwardly at greater depth into the subsurface, through a porous medium -sandy layer. This may probably accounts for the reason while most of the handdug wells in the area are reportedly contaminated with hydrocarbon products.

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Section: Hydrogeologymentioning

confidence: 99%

Section: Hydrogeologymentioning

confidence: 99%

Section: Hydrogeologymentioning

confidence: 99%

Section: Hydrogeologymentioning

confidence: 99%

See 2 more Smart Citations

Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Ayolabi¹,

Folorunso²,

Idem³

2012

ESR

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“…Overexploitation of bore wells at transition zone or at deeper depths along coast leads to salinization of groundwater (Ayolabi et al 2013). Tsunamis, and Tidal and estuarine activities cause infiltration of seawater into coastal aquifers of shallow depth (Mondal et al 2010a;Longe et al 1987;Saxena et al 2003;Lee and Song 2006;Mondal et al 2007;Kim et al 2008;Todd 1953). Thus, groundwater and seawater together play an important role in the hydrological system of coastal aquifers (Mondal et al 2010a, b).…”

Section: Introductionmentioning

confidence: 99%

Hydrochemical Facies and Ionic Exchange in Coastal Aquifers of Puducherry Region, India: Implications for Seawater Intrusion

Sridharan

Nathan

2017

Earth Syst Environ

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Purpose Salinization of groundwater by seawater intrusion is a major concern for the coastal aquifers worldwide. Seawater intrusion occurs mainly due to overpumping of freshwater and sea-level rise which causes lateral and vertical movements of seawater into the coastal aquifers. Methods There are several methods to identify and assess the extent of seawater ingress towards land. In the present study, a hydrochemical approach is adopted to understand the status of intrusion. -/Br -ratio is used to distinguish the causes of salinity in groundwater. The Hydrochemical Facies Evolution diagram (HFE-diagram) and heat maps generated out of it have been very well used to understand evolution of seawater intrusion and freshening process in the coastal aquifer to time. The majority of samples in pre-monsoon fall under the facies Na-HCO 3 / SO 4 , followed by Na-mixHCO 3 /mix SO 4 , Mix Na-HCO 3 / Mix SO 4 , and MixNa-MixHCO 3 /mix SO 4 facies indicating direct cations exchange process, whereas, in post-monsoon, Na-Cl, Mix Na-Cl, and Mix Ca-Cl facies are dominant indicating reverse ion exchange process. In the study area, five locations, viz. Ariyankuppam, Kariambattur, Kalapet, Mutialpet, and Parikalpet, fall under Na-Cl and Ca-Cl facies in pre-and post-monsoon which indicates consistent seawater intrusion. The hydrochemical changes that take place during seawater freshwater interaction along coastal aquifer are determined by ionic exchange. Conclusion About 24.2% of samples in pre-monsoon and 13.5% of samples in post-monsoon show mixing of seawater. The highly negative ionic exchange values of sodium during pre-monsoon indicate increased amount of seawater fraction in groundwater.

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Water scarcity in the fast‐growing megacity of Lagos, Nigeria and opportunities for managed aquifer recharge

Olabode,

Comte

2024

WIREs Water

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In the last three decades, the world has experienced a rapid emergence of megacities. The increasing demographics, urbanization, and water demand brought severe and undesired effects on the quantity and quality of their water resources. A prime example is Lagos (Nigeria, West Africa), which is projected to become the world's largest city by 2100, and faces water scarcity challenges common to other megacities of developing countries. A literature review reveals the vast gap between water demand and regulated supply, inadequate knowledge and information on the current state of water (re)sources, and major, yet unregulated, use of groundwater. It further highlights the impacts of uncontrolled wastewater discharge into surface waters and aquifers, the role of increasing paved surfaces and blocked drainages on flooding, the inadequate supply of potable water, and the unsustainable abstraction of groundwater. Here, we examine the potential of managed aquifer recharge (MAR) to address these recurrent challenges across the megacity. The analysis reveals the opportunities and potential risks associated with the capture of wastewater, storm water, and brackish surface water for MAR. These waters, after appropriate treatment and subsurface storage may bridge the growing water supply–demand gap and mitigate the effects of groundwater (over)exploitation, including aquifer depletion, saltwater intrusion and land subsidence. Immediate efforts should focus on improving the conceptual and quantitative knowledge of Lagos' hydrogeology and groundwater resources through comprehensive spatial–temporal groundwater monitoring and socio‐economic studies of groundwater access and use. The insights provided may inform other fast‐growing coastal megacities in Africa and the wider developing world.This article is categorized under: Science of Water > Water and Environmental Change Engineering Water > Water, Health, and Sanitation Human Water > Value of Water Science of Water > Hydrological Processes

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Hydrogeology of Lagos metropolis

Cited by 81 publications

References 2 publications

Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Application of Electrical Resistivity Tomography in Mapping Subsurface Hydrocarbon Contamination

Hydrochemical Facies and Ionic Exchange in Coastal Aquifers of Puducherry Region, India: Implications for Seawater Intrusion

Water scarcity in the fast‐growing megacity of Lagos, Nigeria and opportunities for managed aquifer recharge

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