Drought and the Impact of Natural Saline River on the Quality of Surface Water Resources In Karoon River(IRAN)

Karoon River is one of the big important rivers in Iran. Goal of the study is to find a suitable solution to improve the water quality, and also to analyze the water quality in DBSR(Dasht-e-Bozorg salty river). The first aim is to analyze the effect of salty rivers on Karoon water quality mostly in Gotvand-Shushtar intervals. The results of physicochemical analysis of water quality in Gotvand, Dasht-e-Bozorg and Band- e- Mizan stationswere are also considered. The results show that the increased amount of salinity in the Karoon River downstream in 2006 compared to the time of dehydration in 2007 were respectively 154 and 42 μ mohs/cm. The qualitative effect of DBSR on the Karoon River in the Gotvand to Band- e- Mizan interval, if the salty water is to be reduced or totally disposed of, would improve the average water quality in terms of pH, electrical conductivity, TDS, chlorine, water hardness and turbidity, respectively to be 16.56, 34.26, 15.73, 15.09, 0.87 and 18.77percent. The increased amount of sulfate concentration to 18.29 would not play an important role in increasing or reducing the salt and it might possibly take effect as a result of drainage and sewage entering the city is in the upstream Band- e- Mizan.