ABSTRACT
The present study focuses on the suitability of irrigation water using indices based on hydro-geochemical parameters of groundwater from 44 fixed bore-wells in Kanchipuram district, Tamil Nadu, during pre-monsoon (May 2011) and post-monsoon (January 2012) seasons. The normalized difference dispersal index (NDDI) method was used for mapping of pre- and post-monsoon groundwater quality at this location. NDDI maps of total dissolved solids (TDS), sodium absorption ratio (SAR), percent sodium (%Na)/sodium hazard, residual sodium carbonate (RSC)/residual alkalinity (RA) ratio and magnesium hazard (MH)/magnesium absorption ratio (MAR)) were generated by integrated geochemical analyses with software Simplex numerica. Maximum NDDI value enrichment is shown by RSC (1.65), which shows major accretion/major attrition; while NDDITDS, NDDISAR, and NDDIMgHR showed accretion of limits of 0.5. Whereas for RSC (–1.16), there is major dilution while NDDINa% showed minor dilution (–0.22) during monsoon (2011–2012).
