Effect of Drought on the Water Quality and Quantity of Dez River

The aim of this study was the evaluation of drought effects through SPI index assessment on the water quality of the Dez River. For the determining the drought, ten-year meteorological data (2005-2014) were achieved through the weather stations of Hussainiya, Dezful, and Shush and for impact evaluation of drought on the water quality of the Dez River, discharge statistics and qualitative parameters related to seven hydrometric stations along the Dez River achieved through Khuzestan Water And Power Authority. The mean frequency of dissolved anions and cations in the hydrometric stations of the Dez River achieved like HCO3>SO4>Cl and Ca>Na>Mg. The variance analysis of the water qualitative parameters showed that the effect of station and year on the amounts of discharge, EC, TDS, SARIW, pH, Cl, HCO3, Ca, Mg, Na, and SO4 had a significant difference (P