Abstract
Groundwater investigations were carried out at Agbarho using geophysical survey method to delineate the aquifer and subsurface lithology. Three (3) vertical electrical sounding were conducted with a maximum current electrode spacing of 300m. The data acquired were subjected to partial curve matching and computer processing. The results delineated five geoelectric layers for the area, which include; topsoil, silty sand, silty clay, fine sand, medium grain sand and coarse sand. The Dar-Zarrouk parameter revealed an aquifer system that has a resistivity values ranging from 503.9-966.9ohm-m, an average hydraulic conductivity of 7.73 m/day, and transmissivity in the range of 156.24-181.44m2/day. The depth to the aquifer range from 13.2-42.7m and the aquifer thickness is between 7-36.7m. Results from seven down-hole logs revealed the presence of silty sand, fine sand and fine-medium grained sand. The transmissivity values from pumping test range from 162.29-286.56m2/day and storativity is from 0.001-0.00838. The aquifer is capable of yielding useful quantity of water to the wells and sustainable groundwater management plan can be develop for the area.
Highlights
The exploration of groundwater is seldom carried out in rural communities because of their heavy dependence on surface water
The study area is underlain by the Sombreiro-Warri Deltaic plain (SWDP), which is a continuation of the Benin Formation (Oomkens, 1974)
The depth to aquifer in the study area varies from 13.2m (VES 3) through 17.3m (VES1) to a maximum of 42.7m (VES 2)
Summary
The exploration of groundwater is seldom carried out in rural communities because of their heavy dependence on surface water. The need to determine suitable depth of penetration of aquifer for potable water resources has led to groundwater exploration by geophysical methods. This is because geophysical methods give better insight on the characteristics of the subsurface formation; thickness of the aquifer and suitable aquiferous zones required for groundwater exploitation. Niger Delta region have been known for oil and gas exploration and exploitation for over four decades and this has resulted in the neglect of the agricultural sector for a long time. Location and Geology: The study area (Figure 1) is located between latitude (50 31N-50 37N) and longitude (50 48E-50 54E) It is part of the Niger Delta sedimentary basin. The study area is underlain by the Sombreiro-Warri Deltaic plain (SWDP), which is a continuation of the Benin Formation (Oomkens, 1974)
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