Abstract
This paper presents aquifer transmissivity values obtained from vertical electrical sounding method from some locations in Port Harcourt Local Government Area of Rivers State. Twelve (12) stations were occupied using the Schlumberger electrode configuration with maximum electrode spacing of 400 m. The data were interpreted using IPI2WIN software version 3.0.1 (2003).The results reveal four layer strata with transmissivity (Tr) values of between 145.53 and 18264.42 m2/day with average value of 7252.23 m2/day. These indicate high aquifer transmissivity values for the study area with high permeable and significant storability of the formations that enhances the migration and circulation of ground water within the region. The results indicate that the southern part of the study area is the most prolific in terms of groundwater exploitation and thus the most promising in sitting productive boreholes.
Highlights
The sitting of boreholes in Rivers State has not been effectively monitored by the Rivers State Water Management Board (RSWMB)
The calculated aquifer parameters are within the range of observed aquifer parameters as obtained from the works of Ehirim and Nwankwo [8] and, Ekine and Osobonye [9]; carried out within the same Benin Formation of the Niger delta
The high values of transmissivity recorded in most parts of the study area agree with the geology of the Benin Formation consisting mainly of fine-mediumcoarse sands
Summary
The sitting of boreholes in Rivers State has not been effectively monitored by the Rivers State Water Management Board (RSWMB). Majority of the boreholes drilled in the state are done without consultation of the Board for these information or proper geophysical investigation of the aquifer characteristics of the area. This practice is common in the state capital Port Harcourt with its increasing population. The consequences of this unplanned sitting of boreholes in future will be environmental problems of declining water table, land subsidence, salt-water intrusion and deteriorated quality by pollutions
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