Browsing by Author "Umar Issa"

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    Groundwater Potential Evaluation in Parts of Southwestern Nigeria Using Dar-Zarouk Parameters
    (LAUTECH Journal of Civil and Environmental Studies, 2022) Saminu Olatunji; Umar Issa; Jimoh Ajadi
    Dar-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 south-western boreholes have values that fall between the standard range of 1.39-1.66, indicating that those areas have boreholes with high productivity. In conclusion, most parts of the study area have excellent protective capacities and high potentiality.
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    TECHNICAL REPORT ON ASA DAM CATCHMENT MANAGEMENT PLAN
    (AGRO-CLIMATIC RESILIENCE IN SEMI-ARID LANDSCAPES (ACRESAL) PROJECT, 2024-11-21) Umar Issa; Alu Olatunji
    The Asa-dam Catchment Management Plan (CMP) is a Catchment Management Plan that is funded by the World Bank and developed under the Agro-Climatic Resilience in Semi-Arid Landscapes (ACReSAL) Project. The Management plan aims at improving sustainable landscape management practices in the Asa-dam catchment area within Sheet 223 Ilorin NW, Kwara state Nigeria. The improvement was targeted towards addressing key environmental and socio economic challenges by providing a comprehensive framework for integrated catchment management to ensure long-term sustainability and resilience against climate change impacts.
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    TECHNICAL REPORT ON LATA NA CATCHMENT MANAGEMENT PLAN
    (AGRO-CLIMATIC RESILIENCE IN SEMI-ARID LANDSCAPES (ACRESAL) PROJECT, 2024-11-14) Umar Issa; Alu Olatunji
    The Lata na Catchment Management Plan (CMP) is a Catchment Management Plan that is funded by the World Bank and developed under the Agro-Climatic Resilience in Semi-Arid Landscapes (ACReSAL) Project. The Management plan aims at improving sustainable landscape management practices in the Lata na catchment area which includes Patigi, Lafiagi and Lata towns all within the Edu Local Government of Kwara State, Nigeria. The improvement was targeted towards addressing key environmental and socio-economic challenges by providing a comprehensive framework for integrated catchment management to ensure long-term sustainability and resilience against climate change impacts.
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    TECHNICAL REPORT ON SHARE CATCHMENT MANAGEMENT PLAN
    (AGRO-CLIMATIC RESILIENCE IN SEMI-ARID LANDSCAPES (ACRESAL) PROJECT, 2024-11-07) Umar Issa; Alu Olatunji
    The Share Catchment Management Plan (SCMP) is a Catchment Management Plan that is funded by the World Bank and developed under the Agro-Climatic Resilience in Semi-Arid Landscapes (ACReSAL) Project. The Management plan aims at improving sustainable landscape management practices in the Share catchment which is the capital of Ifelodun Local Government area of Kwara State, Nigeria. The improvement was targeted towards addressing key environmental and socio-economic challenges by providing a comprehensive framework for integrated catchment management to ensure long-term sustainability and resilience against climate change impacts.
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    Time-Depth Analysis of Tertiary-Cretaceous Sediments of Lake Sub-basin, Northeastern Nigeria
    (MEDGU, 2022-07-24) Gabriel Omolaiye; Jimoh Ajadi; Saminu Olatunji,; Bashiru Ojulari; Taofeeq Issa; Umar Issa
    Time-depth conversion analysis of time migrated seismic images was undertaken on Block A, Baga/Lake sub-basin of Borno basin Nigeria, to predict the appropriate velocity model suitable for depth conversion away from six existing well control points. Three velocity models were used for the time to depth conversion including average velocity-time analytical function, 2nd Order Polynomial time- depth analytical function and instantaneous velocity analytical function. The velocity models were tested with the shallow and deep horizons representing the tops of Kerri-Kerri and Gongila Formations penetrated by six wells fairly spread on the 3,891 km2 of 3D seismic data. The results show that each model has variable degree of accuracy after depth conversion at the two formation tops. The average velocity-time analytical technique appeared as the best technique for the time-depth conversion having errors in the range of -0.12 to 145 meters at shallow and deeper formation respectively. The 2nd order polynomial time-depth analytical function and V0-K techniques gave a depth uncertainty greater than 135 meters at the shallow formation and over 1,000 meters at the deeper formation. The maximum percentage error recorded for both formations using average velocity technique was 0.48% this is less than 5% considered good in the practical situation, it is therefore recommended to be used for velocity modeling and depth conversion study in Baga/Lake sub-basin of Borno Basin, Northeastern Nigeria.