Journals
| S/N | Title | Author(s) | Abstract | Journal Document |
|---|---|---|---|---|
| 111 | Groundwater Vulnerability Assessment of Obafemi Awolowo University Campus, Ile-Ife, Southwestern Nigeria | Konwea, C. I. |
The groundwater vulnerability assessment of Obafemi Awolowo University campus, Ile-Ife, Southwestern Nigeria was carried out using the modified DRASTIC technique, with a view to determine the degree of vulnerability of the groundwater within the area. The study revealed that the area is subdivided into High (2%), Moderate (8%) and Low (90%) groundwater vulnerability regions. The Low groundwater vulnerability region is the most predominant based on the prevailing hydrogeological conditions of geology, lineament density, slope, and thickness of weathered layer. The Low groundwater vulnerability region is most suitable for locating waste dumps, and most of the waste dumps are well situated within this region. However, care should be taken in the development of the site to avoid the reduction or complete removal of the topsoil through excavation; or increasing the permeability of the area through boring of open holes. These processes would increase the vulnerability of groundwater resources. |
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| 112 | Proposed Gbugudu Dam Construction: An Environmental Impact Assessment on the Inhabitants | Ibrahim, O. I. and Mohammed, M. |
Gbugudu is located around Latitude N080° 39' 38.5'', Longitude E040° 46' 28.6’ ‘in Moro area of Kwara state. Impounding Oshin River of about 185 km length will be harnessed for the dam water source. Its axis traverses various communities like Oshin-gada, Oke-oyi, Beri, Ilaga, Onikoko, Gbugudu and many more. The impact the proposed dam will have on its inhabitants and their socio-economic activities was evaluated. Design adopted for the study entailed a detailed analysis of water, soil, and air quality samples in the area. More importantly, questionnaires were designed and administered to assess the salient features in the area that will address the negative impacts of the proposed project. Major findings of this study have revealed the proposed area for the construction of a dam will be feasible to impound water for storage that will be treated for the inhabitants to serve them with good potable water. Catchment area of 38 km2 is envisaged, annual runoff has been estimated to be about 52,988,620 m3 Freeboard is expected to be 2 meters. Crest length and elevation are 106.9m and 45m asl. (above sea level) respectively. Spillway type and discharge rate are evaluated to be broad crested and 377 m3 s-1 respectively. Positive impact prediction on socio-economic, food production and public health are high and good across investigated areas, but adverse impacts will be recorded and include among others sedimentation i.e. silting of the dam, risk of eutrophication/growth of non-native and/or invasive species, growth of aquatic macrophytes in the littoral and sub-littoral zone of the reservoir, creation of favourable habitats for the growth and proliferation of disease vectors, loss of land, noise/air pollution, risk of introduction of new diseases like schistosomiasis, bilharzias. With more positive impacts than the adverse effects the study concluded that the project is feasible and will contribute to economic prosperity of the areas. |
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| 113 | Effects of Wastewater Generation and Management on the Groundwater Resources of Dutse-Alhaji Area, Federal Capital Territory, Central Nigeria | Bamikole, H., and Idris-Nda, A. |
Management of wastewater has been identified as a challenge in developing countries. Poor management of wastewater poses a threat to public health, economy, and the environment. The aim of the study was to examine the effects of wastewater on both groundwater and surface water resources of Dutse-Alhaji Area, Federal Capital Territory, Central Nigeria. The methodology adopted involved a study on the geology using the traverse method at a scale of 1:10,000, hydrogeological studies involved determining the depths and water levels of wells and boreholes, information on wastewater generation and effect was done through the administration of structured questionnaires, water quality analysis was determined through sampling of both ground and surface water and wastewater for laboratory analysis. The result showed that the wastewater generated is mostly from bathing and laundry. Most residents dispose their wastewater by pouring on the ground, soak away, septic tanks and open drainages. Shallow hand dug wells and boreholes are the major sources of water. The physico-chemical composition of the sampled water shows that pH has a range of 7.5 and 8.7, Temperature 29oC and 32oC, Salinity 1231mg/l and 1529mg/l, Chloride 260mg/l and 300mg/l, Sodium 182mg/l and 200mg/l, Potassium 84mg/l and 100mg/l, Calcium 24mg/l and 50mg/l, Magnesium 26mg/l and 40mg/l, sulphate 10mg/l and 19mg/l, Carbonate 370mg/l and 530mg/l and Bicarbonate 945.75mg/l and 1462.5mg/l. Substances found to be occurring in high concentration are bicarbonates, chloride and sodium. Common ailments that afflict the area are malaria and typhoid. Environmental impacts of wastewater in the area include growth of pathogens like mosquito parasite and groundwater pollution. Residents often come in contact with wastewater directly and indirectly. Wastewater finds its way into the groundwater due to the shallow depth of the water sources and improper management, thereby contaminating it. Improved localised wastewater management is recommended, pending the intervention of the government for a central sewer system. Existing and new Hand dug well should be lined with concrete to reduce infiltration rate. |
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| 114 | Application of Electrical Resistivity Imaging (ERI) For Investigation of Groundwater in Iwajaye, Southwestern Nigeria | Ariyo, S. O., Alaka, A. O. and George, G. P. |
Reliance too much on surface water resources in the face of uncertainty of climatic condition is very risky, hence there is need to carry out exploration for another source of portable water mostly groundwater in the study area, Iwajaye area, Southwestern Nigeria. Hence, the work is aimed of mapping the subsurface lithology for determining the groundwater potential of the area. The area under investigation is located within the Crystalline Basement of Southwestern Nigeria with a local geology underlined by Pegmatite. A total of three (3) 2D electrical resistivity imaging was established using the ABEM resistivity meter adopting the Dipole-dipole electrical configuration with a profile length of 500m and electrode spacing of 10m. The measured apparent resistivity value was inputted into the RES2DINV software and was subjected to inversion process to generate the resistivity structural image of the subsurface. The interpretation of the resistivity lithological generated from Profile 1 reveals the presence of weathered unit, fractured basement, and fresh basement with resistivity value range of (40Ωm – 85Ωm), (125Ωm – 310Ωm), (500Ωm – 2000Ωm) respectively. Profile two reveal presence of weathered layer, fractured zone, basement blocks with resistivity rage of (26 Ωm – 120 Ωm), (622 Ωm – 675Ωm) and (709Ωm to 2403Ωm) respectively. Profile 3 shows the presence loose alluvium, moderately resistive blocks, partially weathered basement, and basement blocks with resistivity value (106Ωm – 210Ωm), (306Ωm – 620Ωm), (110Ωm – 210Ωm), (55Ωm – 230Ωm). The geological inference of this lithology on groundwater exploration reveals both the weathered overburden layer and fracture basement as the aquiferous unit in the study area. Conclusively, the occurrence of fracture basement region in profile 1 and 2 reveals the regions has a good groundwater prospect in the study area at depth of 55m and 65m respectively. |
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