Rescuers transfer trapped people by a boat on September 18, 2011 in Nanchong, Sichuan Province of China. According to the Sichuan provincial civil affairs department, at least 13 people were killed and 10 others were missing after persistent heavy rain hit Sichuan province from Friday. (Photo by ChinaFotoPress/Getty Images)

People clean up mud after flood waters receded on September 20, 2011 in Quxian County, Sichuan Province of China. (Photo by ChinaFotoPress/Getty Images)

People queue to get drinking water from water delivery trucks on September 20, 2011 in Quxian County, Sichuan Province of China. (Photo by ChinaFotoPress/Getty Images)