Borehole inventory, groundwater potential and water quality studies in Ayede Ekiti, Southwestern Nigeria
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Date
2021
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Discover Water
Abstract
This study aims at determining the state of government provided boreholes, evaluating groundwater potential and
quality assessment within the Ayede Ekiti community. 12 Vertical Electrical Soundings (VES) were conducted using
Schlumberger array in order to determine geoelectric layers and fracture attributes. Also, 12 water samples were collected
from the study area to evaluate physicochemical characteristics of the groundwater. The study revealed average values
of total depth of boreholes, static water levels and water column in the boreholes to be 18.77 m, 6.77 m and 11.99 m
respectively. 70% of the boreholes are either abandoned, damaged or with evidence of corrosion and encrustation.
Geophysical investigation revealed weathered layer thickness ranging from 1.3 to 34.7 m with two regimes of fracture
at 40–50 and 75–80 m. The frequency of curve types obtained shows 16.67%, 33.33%, 25%, 8.33%, 8.33% and 8.33%
for AK, HA, KH, AA, QH and HK respectively while weathered and fractured basement are identifed as the two types of
aquifer unit. Results of water analysis unveiled that dominance cations are in order Ca2+ >Na+ >K+ >Mg2+while anions are
in the order of HCO3− >Cl− >SO4
2−. Three types of hydrochemical facies present are CaHCO3>NaHCO3>CaCl in 66.67%,
25% and 8.33% respectively. The Wilcox plot suggests the suitability of the groundwater samples for irrigation purposes
when compared with the World Health Organization standards. Despite potential for groundwater and good quality of
analyzed samples, the problem of water in this community istraceable to inadequacy in exploration, shallow boreholes
with consequent seasonal water availability
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Keywords
Ayede ekiti · Borehole inventory · Geoelectric sounding · Groundwater potential · Water quality