"....In a similar case, Turkey, which profits from the headwaters of the Tigris and the Euphrates, has developed 19 hydroelectric power stations and 22 dams as part of their Southeastern Anatolia Project, which is commonly known by its Turkish acronym GAP. The project is intended to increase the quantity of irrigated water available to Turkish farmers. A side effect, however, is that downstream Iraq and Syria have seen a decline of approximately 50 percent of water from both rivers since the 1990's — and the project is still four years from its planned completion date in 2010. Syria obtains around 80 percent of its water supply from these rivers, while Iraq is 100 percent dependent."
More:Water Is Running Out: How Inevitable Are International Conflicts? - Worldpress.org
