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Assessment of Groundwater Quality in a Tidal River Basin of the Ganges Delta in Bangladesh

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Document pages: 21 pages

Abstract: At Shailmari River basin, located in the centralGanges Delta and the southwestern coastal Bangladesh, groundwater is the onlypotable source for water supply due to incompatible surface water sources.However, salinity degradation along with arsenic and iron contamination poses a serious health threat to the basincommunity. Considering this, an investigation was carried out along bothbanks of the river to assess groundwater vulnerability and its quality fordrinking by conducting multi-seasonal water sampling campaigns from 20 domesticwells and analyses (both in-situ and laboratory) for several physico-chemical(pH, EC, TDS and major ions) and biological (coliforms) parameters. The resultsshow slightly alkaline groundwater in the study area with largely variable chemical composition, i.e. EC varies from around 1900 to 2700 μS cm. The abundance of major ions indicates as Na+ > Ca2+ > Mg2+ > K+ for cations and  > Cl- >  >  >  for anions. As per the Canadian water quality index (CCMEWQI), almost all groundwater samplesconcentrate in the marginal category meaning that groundwater is frequentlythreatened. Besides, it is not fully safe for drinking as revealed fromcomparison of geochemical data with national and WHO water quality standards.

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