Abstract
In order to evaluate low-polluted water and its categories,this paper took Lake Erhai as a sample to systematically explore the concept,types and survey method of low-polluted water and to determine its pattern in source,discharge,pollution load and distribution. Results of this study revealed that the annual discharge of low-polluted water in the catchment is 20069 × 104m3/ a,which mainly comes from three different sources: agricultural runoff,urban surface runoff and discharge from water treatment plant. Low-polluted water brings in 1393 ton total nitrogen( TN) and 77 ton total phosphorus( TP) annually. As for spatial distribution,the west and north part of Lake Erhai contain most TN and TP content,in percentages of 88% and 87%,respectively.Therefore,water control action should be carried out according to the characteristics of west and north part of Lake Erhai.
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