ASSESSMENT OF GROUNDWATER QUALITY IN SUNAMGANJ OF BANGLADESH

In this study, groundwater quality in sunamganj of bangladesh was studied based on different indices forirrigation and drinking uses. samples were investigated for sodium absorption ratio, soluble sodiumpercentage, residual sodium carbonate, electrical conductance, magnesium adsorption ratio, kelly’s ratio,total hardness, permeability index, residual sodium bi-carbonate to investigate the ionic toxicity. from theanalytical result, it was revealed that the values of sodium adsorption ratio indicate that ground water ofthe area falls under the category of low sodium hazard. so, there was neither salinity nor toxicity problemof irrigation water, so that ground water can safely be used for long-term irrigation. average totalhardness of the samples in the study area was in the range of between 215 mg/l at tahirpur and 48250mg/l at bishamvarpur. at bishamvarpur, the water was found very hard. average total hardness of thesamples was in the range of between 215 mg/l at tahirpur and 48250 mg/l at bishamvarpur. atbishamvarpur, the water was found very hard. it was shown based on gis analysis that the groundwaterquality in zone-1 could be categorized of “excellent” class, supporting the high suitability for irrigation.in zone-2 and zone-3, the groundwater quality was categorized as “risky” and “poor” respectively. thestudy has also made clear that gis-based methodology can be used effectively for ground water qualitymapping even in small catchments.