WUHAN, March 15 (Xinhua) -- A maintenance inspection has been completed at Danjiangkou reservoir, the water source for the middle route of China's south-to-north water diversion project, the operator said Wednesday.

Experts inspected, recorded, and conducted maintenance of the water monitoring and data transmission systems at the reservoir, as well as facilities at three groundwater monitoring wells on surrounding seismological stations, among others.

This was the most comprehensive maintenance inspection since the reservoir began supplying water to dry areas in the north in 2014.

It was conducted by a company under the Ministry of Water Resources and Changjiang Institute of Survey, Planning, Design and Research.

Danjiangkou Reservoir on the Hanjiang River, a major tributary of the Yangtze, is the water source of the middle route of China's south-to-north water diversion project.

The middle route had transferred more than 10.8 billion cubic meters of water to north China at the end of last year.

The route begins at Danjiangkou in Hubei Province and runs through Henan and Hebei provinces before reaching Beijing and Tianjin.