Browsing by Author "Issa, U"
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Item Evaluation of Groundwater Level Time-Dependent Variation and Aquifer Characteristics within Sheet 223 Ilorin North-West, Southwestern Nigeria(Faculty of Physical Sciences, Chukwuemeka Odumegwu Ojukwu University, 2022) Ajadi, J; Issa, U; Olatunji, SThe assessment of groundwater level time-dependent variation and aquifer characteristics has been carried out, aimed at knowing the variation in groundwater elevation at the end of the rainy season and at the peak of the dry season. The time-dependent variation was done by direct in situ groundwater level measurement from eighty existing wells. Aquifer characteristics were determined by using pumping test data of the available boreholes in the area, using a modified Jacob's method. Configuration of groundwater level contours shows that the highest groundwater elevation in the area is 445 m and the lowest is 295 m above sea level. Also, areas with water levels ranging between 1 and 2 m are areas of low water level while areas with water levels ranging between 9.5 m and 11 m are areas of high water level. Transmissivity is estimated to range between 3.49 and 8.50 m2 /day with an average value of [5.61 m2 /day, Hydraulic conductivity range between 2.18 × 10-1 and 7.64× 10-2 m /day with an average value of 1.65 x 101 m /day and Storativity range from 3.45 to 9.15 with an average value of 5.04. Areas with shallow water levels, depicting high potential, are in the southern part while the northern part is an area of low groundwater potential. The average value for Storativity is higher than the assigned limit (0.005-0.00005) for most confined aquifers, indicating that the storage potential of the boreholes is high; hence their recharge potential is high.Item Evaluation of Groundwater Level Time-Dependent Variation and Aquifer Characteristics within Sheet 223 Ilorin North-West, Southwestern Nigeria(Faculty of Physical Sciences, Chukwuemeka Odumegwu Ojukwu University, 2022) Ajadi, J; Issa, U; Olatunji, SThe assessment of groundwater level time-dependent variation and aquifer characteristics has been carried out, aimed at knowing the variation in groundwater elevation at the end of the rainy season and at the peak of the dry season. The time-dependent variation was done by direct in situ groundwater level measurement from eighty existing wells. Aquifer characteristics were determined by using pumping test data of the available boreholes in the area, using modified Jacob's method. Configuration of groundwater level contours shows that the highest groundwater elevation in the area is 445 m and the lowest is 295 m above sea level. Also, areas with water levels ranging between 1 and 2 m are areas of low water level while areas with water levels ranging between 9.5 m and 11 m are areas of high water level. Transmissivity is estimated to range between 3.49 and 8.50 m2 /day with an average vale of [5.61 m2 /day, Hydraulic conductivity range between 2.18 × 10-1 and 7.64× 10-2 m /dav with an average value of 1.65 x 101 m /day and Storativity range from 3.45 to 9.15 with an average value of 5.04. Areas with the shallow water level, depicting high potential, are in the southern part while the northern part is an area of low groundwater potential. The average value for Storativity is higher than the assigned limit (0.005-0.00005) for most confined aquifers, indicating that the storage potential of the boreholes is high; hence their recharge potential is high.Item Groundwater Potential Evaluation in Parts of Southwestern Nigeria using Dar-Zarouk Parameters(Department of Civil Engineering, Ladoke Akintola University of Technology, Ogbomoso, 2022) Olatunji, S; Issa, U; Ajadi, JDar-Zarouk parameters namely longitudinal conductance, transverse unit resistance, longitudinal resistivity, traverse resistivity, and coefficient of anisotropy; derived from electrical resistivity soundings, were employed in the western and south western portions of Sheet 223 Ilorin NW, Southwestern Nigeria to evaluate the subsurface water prospect. This is aimed at determining the potentiality and vulnerability of groundwater in the area. The longitudinal conductance values obtained range from 0.027 S at VES 3 in the north, indicating the poorest protective capacity, to 26440.95 S at VES 157 in the south, indicating the highest protectivity. Thus, the protective capacity rating of the study area shows very poorly, weak, moderate, good, and excellent ratings at VES stations 10, 12, 9, 2, and 178 respectively. The total transverse resistance range is 8.6 - 32733.87 Ωm2, with the lowest at VES 206 in the southeastern part, indicating high prospects, and the highest at VES 47 in the northern part of the area, indicating poor prospect. The lowest longitudinal resistivity (0.1951 Ωm), indicating high potential as well, occurs at the southern part and while the highest value of 8095.63 Ωm is obtained at the northern part. Furthermore, the coefficient of anisotropy in the area ranges between 0.029 and 5349.78. The southwestern boreholes have values that fall between the standard range of 1.39-1.66, indicating that those protective capacities and high potentiality areas have boreholes with high productivity: In conclusion, most parts of the study area have excellentItem Groundwater Potential Evaluation in Parts of Southwestern Nigeria using Dar-Zarouk Parameters(Department of Civil Engineering, Ladoke Akintola University of Technology, 2022) Olatunji, S; Issa, U; Ajadi, JDar-Zarouk parameters namely longitudinal conductance, transverse unit resistance, longitudinal resistivity, traverse resistivity, and coefficient of anisotropy; derived from electrical resistivity soundings, were employed in the western and southwestern portions of Sheet 223 Ilorin NW, Southwestern Nigeria to evaluate the subsurface water prospect. This is aimed at determining the potentiality and vulnerability of groundwater in the area. The longitudinal conductance values obtained range from 0.027 S at VES 3 in the north, indicating the poorest protective capacity, to 26440.95 S at VES 157 in the south, indicating the highest protectivity. Thus, the protective capacity rating of the study area shows very poor, weak, moderate, good, and excellent ratings at VES stations 10, 12, 9, 2, and 178 respectively. The total transverse resistance range is 8.6 - 32733.87 Ωm2, with the lowest at VES 206 in the southeastern part, indicating high prospects, and the highest at VES 47 in the northern part of the area, indicating poor prospects. The lowest longitudinal resistivity (0.1951 Ωm), indicating high potential as well, occurs in the southern part and while the highest value of 8095.63 Ωm is obtained in the northern part. Furthermore, the coefficient of anisotropy in the area ranges between 0.029 and 5349.78. The southwestern boreholes have values that fall between the standard range of 1.39-1.66, indicating that those protective capacities and high potentiality areas have boreholes with high productivity: In conclusion, most parts of the study area have excellent