Assessment of Groundwater Quality in the Talensi District, Northern Ghana
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Date
2020-04-10
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e Scientific World Journal
Abstract
A comprehensive chemical quality assessment of groundwater resources in the Talensi District has been conducted using
conventional graphical methods and multivariate statistical techniques. ,e study sought to determine the main controls of
groundwater chemistry and its suitability for domestic and irrigation purposes in the district. Silicate and carbonate mineral
weathering were identified as the main controls on groundwater chemistry in the district, with reverse ion exchange also playing a
role. High nitrate and lead levels observed have been associated with agrochemicals and wastewater from farms and homes. ,ree
main flow regimes have been identified with Q-mode cluster analysis, in which mixed cation water types have been revealed,
where areas designated as recharge zones are dominated by Na+ +K+–Mg2+–HCO3
− fresh water types characterised by low
mineralisation and pH, which evolve into Mg2+– Na+ + K+– HCO3
− fresh water type with corresponding increased mineralisation
of the groundwater. Based on the water quality index (WQI) technique modified for the district and an interpolation technique
using ordinary kriging developed from a well-fitted exponential semivariogram for the estimated WQIs, the groundwater quality
has been spatially classified as generally ‘good’ to ‘excellent’ for domestic purposes. Generally, the quality of groundwater for
domestic usage deteriorates as one moves towards the north of the district, whereas waters in the east and west present the best
quality. Classifications based on the United States Salinity Laboratory (USSL), Wilcox, and Doneen diagrams suggest that
groundwater from the unconfined aquifers of the district is of excellent quality for irrigation purposes.
Description
Research Article
Keywords
water quality index (WQI), Talensi District, United States Salinity Laboratory (USSL), groundwater