Groundwater Assessment Quality for Dakar City Supply against WHO Standards

Le résumé fourni par la source

Dakar city is located in the western part of Senegal, where groundwater plays an important role in drinking water supply. The present study helps to assess and determine the groundwater quality for domestic use in the area. For these purposes, groundwater samples were collected from 20, 19 and 12drinking water pumping and piezometer wells respectively in the Infrabasaltic, Maastrichtian, Paleocene aquifers and analyzed. The results of the chemical analysis indicate that Na+> Mg2+> Ca2+> K+ (infrabasaltic), Na+> Ca2+> Mg2+> K+ (Maastrichtian and Paleocene) was the most dominant cation sequence, while Cl-> HCO3-> SO42-> NO3-was the most dominant one for anions in the aquifers water sampled. The chemical analysis of our samples showed, that the Cl- Ca-Mg facies was dominant in the infrabasaltic aquifer, while HCO3-Na-K facies represent the dominant one inMaastrichtian and Paleocene aquifers. A comparison of the measured groundwater quality in relation to WHO drinking water quality standards revealed that 80, 75 and 86 % of the groundwater sampled in the infrabasaltic, Maastrichtian and Paleocene aquifers, respectively are suitable for drinking purposes.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.