The presupposition of water rights transaction is distribution differentiation of space-time, non-equilibrium of supply-demand and marginal return rate differentiation of water rights owners.
水资源时空分布的差异性、供求的不均衡性和水权主体边际资源回报率的差异，是水权交易制度存在的前提和基础。
After the functional relation between designed flow rate and water demand unit is analyzed, the concept of demarcation point of water supply is put forward, which is convenient for actual .
文章通过实例，详细讨论了三种计算方法的合理性，通过讨论设计流量与用水单位数之间的函数关系，最后提出给水分界点的观念，便于工程实际应用。
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