Water requirement of man-made lake depend on the ecological water requirement for maintaining the lake water balance and the environmental water requirement to achieve water quality objective. To determine the water requirement is one of the main design contents for man-made lake. In this paper,as for the man-made lake in Shangyu, possible pollution sources after the lake construction were analyzed. Water quality of the man-made lake was predicted using TP mass balance model with considering different sewage interception rate and the effect of ecological measures, meanwhile. the quantity and relevant quality of water requirements under different conditions were obtained. Water quality prediction results showed when domestic sewage interception rate was 100% and TP concentration of replenish water lower than 0. 10 mg/L,the water requirement was 2. 4 million t/a;when domestic sewage interception rate was 95% and TP concentration of replenish water was 0. 05 mg/L,the water requirement was 16 million t/a; when domestic sewage interception rate was 95% and TP concentration of replenish water was 0. 05 mg/L,the water requirement was 7. 3 million t/a if considering the effect of ecological measures.%人工湖需水量是指维持湖区水量平衡、满足人工湖水质目标的供水量,人工湖需水量确定是人工湖水体工程设计的主要内容之一.以上虞滨海新城建设的人工湖为例,分析了人工湖建成后的可能污染源,采用TP质量守恒模型,预测了不同生活污水截污率、生态措施作用前后的人工湖需水量及水质要求.结果表明,当生活污水截污率为100％时,若供水TP≤0.10 mg/L,则人工湖需水量为240万t/a;当生活污水截污率为95％时,若供水TP=0.05 mg/L,不考虑生态措施作用,则人工湖需水量为1600万t/a;当生活污水截污率为95％时,若供水TP=0.05 mg/L,在生态措施作用下人工湖需水量为730万t/a.
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