Analysis of Groundwater Suitability for Irrigation Purpose Using Overlay Technique

This study is employed in Sweta Nadi Basin, Water quality data for 34 control wells collected from Groundwater Division for the year 1980-2010 are taken into consideration for the analysis. These observation wells are regularly maintained by the Public Works Department of Government of Tamil Nadu. The results show that the class of groundwater for irrigation purpose (Highly suitable , Suitable, Moderately Suitable, Unsuitable and Highly unsuitable) that predominated in the study area, during pre and post monsoon seasons and were analyzed for hydro parameters such as (PH) Hydrogen ion concentration, (TH) Total hardness, (TDS) Total Dissolved Solids, (PI) Permeability index, (SSP) Sodium soluble percent, (EC) Electrical conductivity, (SAR) Sodium adsorption ratio and (RSC) Residual sodium carbonate. The important ratios and indices (PH, TH, TDS, PI, SSP, EC, SAR and RSC) are considered to evaluate the groundwater for agriculture purpose.