A man walks on a mud-coverd street after a significant water decline in Zhouqu County, northwest China's Gansu Province, Aug. 24, 2010. After days of dredge work in the Bailong River, Zhouqu witnessed a significant decline of the water level, flood on some of the street began to subside. (XinhuaLiang Qiang)

A boy looks at a flooded campus after a significant water decline in Zhouqu County, northwest China's Gansu Province, Aug. 24, 2010. After days of dredge work in the Bailong River, Zhouqu witnessed a significant decline of the water level, flood on some of the street began to subside. (Xinhua/Liang Qiang)

A woman cleans up the mud outside a store after a significant water decline in Zhouqu County, northwest China's Gansu Province, Aug. 24, 2010. After days of dredge work in the Bailong River, Zhouqu witnessed a significant decline of the water level, flood on some of the street began to subside. (Xinhua/Liang Qiang)

People clean up the mud outside a store after a significant water decline in Zhouqu County, northwest China's Gansu Province, Aug. 24, 2010. After days of dredge work in the Bailong River, Zhouqu witnessed a significant decline of the water level, flood on some of the street began to subside. (Xinhua/Liang Qiang)