As lack of rain reduces levels of the Xijiang and Xiangjiang Rivers to historic lows in December 2011, over 900 ships are halted from operation in order to preserve drinking water in the reservoirs rather than allow it to flow into the drying rivers.

http://news.sina.com.cn/c/2011-12-19/010923652907.shtml
http://www.newkerala.com/news/2011/worldnews-129215.html