Hydrogeological and water quality evaluation of parts of River Mamu Sub-Basin, Southeastern Nigeria

Anakwuba, Emmanuel; Okolo, C. M.; Chibuzor, Valeria Chibuzo; Chibuzor, Stella Nwaife; Chinwuko, Augustine Ifeanyi

doi:10.19111/bulletinofmre.941090

Cited by 2 publications

(4 citation statements)

References 32 publications

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“…It was observed that topography, lithology, and geology are the major factors that control depth to water table and aquifer thickness in the study area. The present result is agreement with other studies carried out in other locations [8,9,13].…”

Section: Identification Of Aquiferous Units and Regional Water Table ...supporting

confidence: 94%

“…parts of the study area have greater depth to water table. This implies that the water table were observed to mimic the topography of the area[8].…”

mentioning

confidence: 88%

“…The depth to the aquifers in the region ranges from 134 m to 237 m below the ground [7]. Anakwuba et al, [8], carried out the hydrogeological and water quality evaluation of parts of River Mamu sub-basin and estimated the average depth to aquifers and their thicknesses to be 109.9 and 11.8m respectively. K and T values range from 0.04-0.09m/s and 0.72-1.53m2/s respectively depicting aquifers with enhanced specific storage, and material transport [9].…”

Section: Hydrogeologymentioning

confidence: 99%

“…The calculated WQI values show the water ranged from unsuitable to excellent. Also, the Heavy Metal Pollution Index indicated the [8], carried out the hydrogeological and water quality evaluation of parts of River Mamu sub-basin, southeastern Nigeria and observed that the concentration of the major ions, TDS and EC were within the WHO permissible guidelines for drinking water, while heavy metals concentrations exceeded the permissible guideline values. They also found the dominant geochemical processes to be rockwater interaction in groundwater, which they suggest accounted for the major contribution of dissolved ions and precipitation in the surface water.…”

Section: Hydrochemistrymentioning

confidence: 99%

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Potential Impacts of Okpuno Egbu Dumpsite on Groundwater Resources in Parts of Nnewi, Southeastern Nigeria

Emecheta,

Okpara,

Ifeanyichukwu

et al. 2023

JGEESI

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The study area, Nnewi is one of the most populated, commercial and industrialized cities in Anambra State. Geophysical data were collected from 15 vertical electrical sounding (VES) points and hydrogeochemical analysis of 15 groundwater samples collected from 15 locations were analyzed for their chemical composition and used to assess the impact of the dumpsite at Okpunoegbu on groundwater in the study area. The results of the vertical electrical sounding indicate that most of the aquiferous units fall within the fourth layer at most of the Relocations with an average resistivity of 1340.25Ωm, an average thickness of 41.75m and average depth of 51.25m. The range of the regional water table is from 25.41m to 99.42m. The Dar-Zarrouk parameters; longitudinal conductance and transverse resistance, s and t were determined from the geophysical data to be 0.007mho and 55966.9Ω respectively. The results of s indicate that the protective capacity of the overburden layers to underlying aquifer is low. which implies easy transmission of pollutants to the aquifers making them vulnerable to pollution. The results of water analysis show that the range of pH in the samples is between 5.73 to 6.95 indicating that 20% of the water samples are slightly acidic and 80% to alkaline. TDS, TSS and EC were found to be within the permissible limits of WHO and NSDWQ standard guidelines. COD and BOD were above the permissible limits indicating the water samples to be severely polluted. DO1 and DO5 range between 22.78 - 65.40 mg/L and 48-358.96 mg/L respectively. The major cations and anions were within the permissible limits.. However, the heavy metals range in samples were cadmium (0.04-0.37mg/L), chromium (0.01-0.10mg/L), mercury (0-0-07mg/L) and lead (0.1-0.93mg/L), exceed the permissible limits in some samples. The geospatial distribution maps of the heavy metals implicate the dumpsite and other sources as contributors of the increased concentrations of cadmium and lead. while indicating the dump as a major contributor of chromium and mercury to groundwater in the study area. The calculated quality indices, WQI and HMPI rate the groundwater as highly polluted and unsuitable for drinking, and the CD and HMEI as moderately to highly polluted, respectively. The identified hydrochemical facies classify the water as Ca-Cl and Ca-Mg –Cl – SO4 water type. The Cl – SO4 facie indicate end water usually with increased age found in the discharge areas. The Okpunoegbu dumpsite is an important source of groundwater contaminants and pollutants especially the heavy metals such as cadmium, mercury, chromium and lead. The protective capacity of the overburden is enhancing the vulnerability of the aquifers to pollution as they are rated as low. It is recommended that some remediation measures be carried out to restore the groundwater quality and prevent further pollution being initiated and appropriate water treatment be carried before use for drinking purposes.

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Section: Identification Of Aquiferous Units and Regional Water Table ...supporting

confidence: 94%

“…parts of the study area have greater depth to water table. This implies that the water table were observed to mimic the topography of the area[8].…”

mentioning

confidence: 88%

Section: Hydrogeologymentioning

confidence: 99%

Section: Hydrochemistrymentioning

confidence: 99%

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