Photo taken on May 1, 2013 shows the naked riverbed at the Yunxian segment of the Hanjiang River in Yunxian County, central China's Hubei Province. The water level of the Hanjiang River in Yunxian County keeps declining since this spring due to the low rainfall, affecting the river's navigation. The water level here by 12 p.m. on May 1 stood at 137.49 meters, 19.65 meters less than the highest level of last year. [Xinhua]