Assessment of Groundwater Potential of Risha Part of Akwanga Sheet 209NE, North Central Nigeria (Published)
A geological traverse was undertaken in Risha, part of Akwanga Sheet 209NE North-Central Nigeria to appraise the rock types and their structural patterns that might enhance prospect for water. Three rock types; schistose-gneiss, granite-gneiss and pegmatite, with their main structural pattern were discovered, trending mostly NW-SE. Analysis of twenty-three Vertical Electrical Resistivity Soundings (VES) carried out in the area using the Campus Ohmega digital resistivity meter showed that the field curves were of H, KH, HK, A and K types. There were majorly four to five geoelectrical layers consisting of topsoil (sand/clay) with depth range of 0.3-2.4m and resistivity value of 66-2850Ωm. The second layer is lateritic clay with depth range of 0.4-5.7m and resistivity range of 222-3575Ωm. The third layer had a depth range of 1.2-8.6m with resistivity of 40-4591Ωm, while the fourth layer, weathered rocks or regolith, has a depth range of 3-33m and resistivity range of 49-23668Ωm. Two locations gave six lithological layers/units being partially fractured/fresh basement with resistivity values of 1028-4574Ωm and depth range of 11.4-24m. The water potential of the area may be classified as poor, moderate, good and very good and varied from location to location. The groundwater potential area varies with high potential around Risha, Tidde and Ridam compared to Ade-Katako, Ngazzu, AngwanDorowa, Ngakide and Adande. Based on the textures, structural pattern and well measurement interpretations, the granite gneiss was observed to have more water prospectivity than the schistose gneiss.
Keywords: Basement Complex, Groundwater, Resistivity, Rocks, potential
Delineating Ground Water Potential Using Electrical Resistivity Method in Adamawa State University Permanent Site, Mubi North –Eastern Nigeria. (Published)
Delineating ground water potential using electrical resistivity method in Adamawa State University permanent site, Mubi North – Eastern Nigeria was carried out to determine depth to the groundwater potential zones, the lithology of the area and possible best site for drilling bore holes. Ten VES points were sounded in the study area with the ABEM SAS 1000 Terameter. The maximum electrode spacing was 100m.Schlumberger array was used during the acquisition of data. Two methods were also used for interpretation of the result which are qualitative and quantitative methods, 1XD interpex software was used to interpret the raw data. Possible groundwater potential areas were detected. Out of the ten VES points; VES 11,12 and 20 were found to be potential zone for ground water exploration due to the presence of fracture/weathered zone and low resistivity, it has a depth ranging from 40m to 70m while VES points 13,14, 15,16,17,18 and 19 do not possess ground water potentials because they have high resistivity values.
Keywords: Groundwater, Lithology and Schlumberger array., Terameter, vertical electrical sounding (VES)
Assessment of Groundwater Potential of Risha Part of Akwanga Sheet 209NE, North Central Nigeria (Published)
A geological traverse was undertaken in Risha, part of Akwanga Sheet 209NE North-Central Nigeria to appraise the rock types and their structural patterns that might enhance prospect for water. Three rock types; schistose-gneiss, granite-gneiss and pegmatite, with their main structural pattern were discovered, trending mostly NW-SE. Analysis of twenty-three Vertical Electrical Resistivity Soundings (VES) carried out in the area using the Campus Ohmega digital resistivity meter showed that the field curves were of H, KH, HK, A and K types. There were majorly four to five geoelectrical layers consisting of topsoil (sand/clay) with depth range of 0.3-2.4m and resistivity value of 66-2850Ωm. The second layer is lateritic clay with depth range of 0.4-5.7m and resistivity range of 222-3575Ωm. The third layer had a depth range of 1.2-8.6m with resistivity of 40-4591Ωm, while the fourth layer, weathered rocks or regolith, has a depth range of 3-33m and resistivity range of 49-23668Ωm. Two locations gave six lithological layers/units being partially fractured/fresh basement with resistivity values of 1028-4574Ωm and depth range of 11.4-24m. The water potential of the area may be classified as poor, moderate, good and very good and varied from location to location. The groundwater potential area varies with high potential around Risha, Tidde and Ridam compared to Ade-Katako, Ngazzu, AngwanDorowa, Ngakide and Adande. Based on the textures, structural pattern and well measurement interpretations, the granite gneiss was observed to have more water prospectivity than the schistose gneiss.
Keywords: Basement Complex, Groundwater, Resistivity, Rocks, potential