Hydrogeology and Physico-Chemical Quality Assessment of Groundwater in Oke-Oyi Area and Environs, Kwara State, Nigeria
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Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Environment and Earth Science
Abstract
An appraisal of the groundwater potential as well as its potability in Oke-Oyi area and its environs was
undertaken. This was done in order to provide information on the evaluation of groundwater system in the area
as well as on the physico-chemical quality of the groundwater for domestic and Agricultural purposes. The Study
entails analysing pumping test data in order to compute the hydraulic characteristics of seven boreholes in the
area. Fifteen groundwater samples were also collected from boreholes and hand-dug wells in the area and
analysed for their physical and chemical properties.The two aquifer units in the area are weathered overburden
aquifer and fractured crystalline aquifer. The boreholes tapping these aquifers have yields that range from
43.2m3
/day to 103.7 m3
/day with a mean value of 58.01 m3
/day, hydraulic conductivity values range between
1.17×10-1 m/day and 8.60 ×10-2 m/day with a mean value of 6.27×10-2 m/day. Transmissivity varies from
0.95m2
/day to 3.16 m2
/day with an average value of 1.77 m2
/day. The storage coefficient (S) calculated shows
values that range from 0.619 to 1.765 with a mean value of 1.238. Results obtained from the physico chemical
analysis of the groundwater in the area shows that the physical parameters such as colour, taste and odour are
within the acceptable limits of WHO (2006). Also, the major ions analysed are Ca, Mg, Na, K, Fe, SO4, NO3, Cl,
CO3 and HCO3 and are all below the acceptable limits of WHO (2006). Hence the groundwater of the area is
largely characterised as Mg-HCO3
-Cl and Mg-HCO3.The groundwater of the area has a low-medium salinity
hazard and low sodium hazard, indicating that the groundwater is good for Agricultural purposes. The
groundwater has a high recharge potential due to its low storage capacity. Also the groundwater is potable for
domestic and Agricultural purposes, based on the physical and chemical parameters of the groundwater analysed
which are within the acceptable limits of WHO as well as low-medium salinity hazard of the groundwater
Description
This article is an hydrogeologically based scholarly publication