![](http://l.yimg.com/a/i/ww/news/2010/07/13/floods1.jpg)
Work crews blow holes in dams to drain fast-rising water levels in China.
Also: 900-year-old Song dynasty drains save Chinese city from deadly floods
A 900-year-old drainage system has saved a city in south China from severe floods that have left over one hundred people dead and a million homeless across the region.
![http://i.telegraph.co.uk/telegraph/multimedia/archive/01678/drain_1678959c.jpg](http://i.telegraph.co.uk/telegraph/multimedia/archive/01678/drain_1678959c.jpg)
The drainage system uses the natural camber of the city to quickly channel water outward.
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