Beijing and Tianjin may run into problems with their water supply in the future, warned one CPPCC delegate at this week's annual meeting. 

The South-to-North Water Diversion project has provided northern cities with additional water since the early 2014, but Beijing has become over-reliant on good-quality water from the south. There is also an increasing need and demand for water in the receiving areas. 

A chief engineer and professor, Zhong Zhiyu, also warned that it is hard to guarantee the supply of water, as the Danjiangkou Reservoir in central China may experience drier year.

Water supply is a huge problem for Beijing, which is exacerbated by dry winters and a growing population. It is over-reliant on the diverted water from the south, Zhong says, and more needs to be done to prevent any serious shortages in the future.

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