Water quality of Danjiangkou reservoir

Water quality requirements of the middle route of South-to-North Water Transfer Project.

The water quality of Danjiangkou Reservoir meets the national Class II standard and meets the water quality requirements of the Middle Route of South-to-North Water Transfer Project. Danjiangkou Reservoir is located in the middle and upper reaches of Hanjiang River. It is the largest artificial freshwater lake in Asia and a national first-class water source protection zone. The main source of water comes from the Han River. The largest tributary of the Han River is the Lanhe River, and the headwater of the Lanhe River is Dajiu Lake, which belongs to Shennongjia Scenic Area and is a subalpine wetland.