Qualitative zoning of groundwater to assessment suitable irrigation water using GIS in Kelachai Region

Water quality must be tested before it can be used for agricultural purposes since difficulties might arise in terms of increased soil salinity, decreased soil permeability, and decreased water absorption by plant roots; leading to reduced agricultural productivity. The aim of this study was to used Arc GIS (for graphical representation of the qualitative parameter's variations) as well as the conventional diagrams and parameters used for agricultural water quality classification for studying and zoning agricultural water quality in Kelachai Region in Iran. Results showed that the quality of all samples was classified as excellent for agricultural purposes in terms of the following parameters and diagrams: MR, SAR, Na%, RSC, pH, KR , CR, PS (just for w6 and w8), Wilcox diagram (except for w5), Gordon diagram just w7, w14, and w15, and Doneen diagram(except for w13,w14,w15) . In terms of correlation, the most and least correlations were found to exist between Na% and KR, and EC and PI parameters respectively.