An attempt has been made to understand the ground water quality and its suitability for irrigation purpose through Geographical Information System. The qualities of groundwater in 646.8 km2 area of Durg block were assessed for its suitability for irrigation purposes. Groundwater samples data are analyzed for ionic concentration of C0₃², HC0₃^-, CI^-, S0₄^2-, Ca₂, Mg₂⁺,Na⁺⁺and K⁺. Parameters such as electrical conductivity (EC), sodium absorption ratio (SAR), % Na and residual sodium carbonate (RSC) were evaluated. Thematic maps of different parameters were prepared and Samples were plotted on US Salinity Diagram and H. Wilcox’s Diagram for better understanding of suitability of groundwater for irrigation purpose. The EC values of water samples were found to be within good to permissible limits. The lowest EC in groundwater samples was observed in Bhilai (554 µS/cm)and the highest in Durg (1593 µS/cm). The output of SAR shows 100 percent of the samples fall under excellent to good category. The irrigational water quality was classified based on US salinity diagram indicating that in 4 samples fall under low to moderate saline and 6 samples fall under low to medium high salinity. The Wilcox diagram shows 4 samples fall under excellent to good category and 6 samples fall under good to permissible category. Samples were analyzed for water quality parameters like % Na, PI, RSC and KI and suitability of groundwater samples for irrigation is good to permissible in almost all cases. Contour maps of pH, EC, SAR, % Na and RSC were plotted to study spatial variability of these parameters in the block which is helpful to assess the irrigational water quality of study area.

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