Streams in Turkey that fall outside of the Ceyhan Delta have lost 20 to 70 percent of their discharge velocity, the report titled Lakes and Wetlands Action Plan said.
Farmers in Turkey were able to draw water as shallow as 20 meters underground, but now need to dig as far as 200 meters, the report said.
Such severe drought is likely to cause large migration patterns in the near future, Water Policies Association chair Dursun Yıldız said.
Beyşehir Lake's depth dropped from 26 meters to six, while Eğirdir Lake shrank from 14 meters to five.