Spatial analysis on drinking well water quality in eravur pattu divisional secretariat, Batticaloa, Sri Lanka

Ground water is the only source for irrigation, drinking and domestic purposes in Batticaloa District. This study focused on the characterization of an independent aquifer in three selected GN divisions namely Koduwamadu, Pankudaweli and Veppaweduwan in EravurPattu DS division for its suitability for drinking. Groundwater samples were collected from wells to represent public and individual wells including dug and tube wells in the period of November 2013 to May 2014. Important parameters namely pH, EC and total dissolved solids were determined in water samples from 60 wells, while 15 wells were further studied for chemical parameters such as nitrite, nitrate and phosphate. Attribute information of the result was entered into a GIS database and analyzed through Geo statistical analysis tool and displayed on maps to show concentration levels at each site using Interpolation method via Kriging techniques. Significant spatial variations were observed in the maps where it exceeds the permissible limit in some locations. The intrusion of lagoon water, intensive agricultural use and depth of well are some of the influencing factors for the spatial variation of parameters. Continuous monitoring and quality assessment in well water are necessary to avoid possible health hazards to the people in the area.