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Flow rate of Karun river, which is the longest and largest river in Iran, decreased from 600 to 100 m3/s in average, due to the drought in early 2008. This reduction caused water from Persian Gulf to advance farup-river and reach a raw water supply basin and increase water electrical conductivity (EC) to 5,000 μmoh/cm. A temporary dam constructed from soil-sheet pile was installed to prevent salty...