https://irannewswire.org/2018/06/12/water-crisis-in-iran-leads-to-a-dangerous-condition/
The current water crisis in Iran began almost ten years ago. Iran has virtually dried all its rivers by exploiting 97% of its surface waters, and there is no more nature water left. This means that if they continue to do this, about 70 percent of Iranians, a population of 50 million people, will have to migrate from the country to survive.