Assessment of Bangladesh groundwater for drinking and irrigation using weighted overlay analysis

A weighted overlay analysis was conducted to calculate Water Quality Index (WQI) for drinking water using WHO and Bangladesh drinking water standards (BDWS) and for irrigation using irrigation water quality standards. The method used a normalized quality rating scale (qi) and relative weight (wi) for several water quality parameters to calculate WQI. This index-based suitability analysis was carried out to assess the overall water quality of groundwater in Bangladesh used for drinking and irrigation purposes.