Geoelectric Assessment of Ground Water Prospects and Vulnerability of Overburdened Aquifer in Oleh Delta State, Nigeria

摘要

Vertical Electrical Sounding using Schlumberger arrangement was carried out in Oleh Community not only to assess the groundwater potential but determine the vulnerability of the overburdened aquifer and hence establish areas having high potential for appreciable and sustainable groundwater supply. Fourteen (14) stations were established and surveyed using a maximum current electrode separation of 300.00 m. The field data obtained was first analyzed by curve matching before computer iteration. The result showed that apart from the locations in VES 5, 6, 7 and 11 that has shallow aquifer and may be easily contaminated; boreholes could be sited in every other location to a depth of 35.00 m at the 4th layer for potable and sustainable water supply. The analysis of the borehole water at Oleh revealed that values for acidity, alkalinity, hardness, turbidity and conductivity in the groundwater is within the safe standard values for drinkable water apart from being slightly acidic. This acidity is associated with the gas flaring in the study area. The overburden protective capacity was evaluated using Longitudinal Conductivity of Protecting layers and this showed that apart from VES 4 obtained from Ogbemudia Road in Oleh that is weakly protected, every other locations are poorly protected hence in the event of pollution, groundwater in Oleh is easily contaminated.