IMPACT OF AGRICULTURAL ACTIVITY ON GROUNDWATER QUALITY TECHNOLOGY IN VANIYAR SUB-BASIN, PONNAIYAR RIVER, SOUTH INDIAK.R. Kalphana and R. VelkennedyAbstract Vaniyar Sub-basin falls in Salem and Dharmapuri Districts of Tamil Nadu and an area extent of about 591.43 km2. Represented groundwater samples were collected from 60 locations during the period of postmonsoon season (January) 2014. The physicochemical parameters investigated were conductivity, total dissolved solids and pH, as well as related to the chemical parameters such as calcium, magnesium, sodium, potassium, chloride, sulphate, bi-carbonate, nitrate, fluoride and calculated parameters (including sodium absorption ratio, Residual sodium carbonate, Kelleys ratio, Sodium percentage and Soluble sodium percentage) calculation were used to assume the suitability of the groundwater for irrigational purpose. Organized in the groundwater chemical evolution where the waterrock interaction processes are considered important in the definition of their calcium-bicarbonate type visible in a Piper diagram. The data were interpreted using Wilcox and USSL Classifications. The groundwater samples fall under good to permissible (Wilcox Diagram) zone. The SAR values were plotted in the USSL staff diagram and found most of the groundwater samples belongs to C3-S1 (68.33%). These results were taken into GIS platform, to prepare the spatial distribution maps. Finally GIS output maps result reveals that 514.34 Km2 areas fall in (Wilcox) Good to Permissible category and 476.87 Km2 area falls in (USSL) C3-S1 category. The above said areas indicate that the groundwater could be used for all types of crops.
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