This text introduces circumstance, water quality, main contamination sources in the Danjiangkou Reservoir, measures taken by related authorities to ensure South water going to Beijing remaining clear.

• 为确保一江清水送北京,现从五个方面论述了丹江口水库的基本情况、水质情况、主要污染源、各级政府已采取的措施和解决问题的方法。