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。
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.
第三部分，水权交易的制度前提分析。
Part III deals with the institutional presupposition of water rights transaction.
远距离跨流域的调水工程，需要建立有效的水权制度，形成水资源交易市场，完善利益分配机制，建立合理的调水工程营运管理体制。
For the long distance water transfer projects, it is necessary to build effective water property system, trade market, benefits allocation mechanism and project management system.
在水资源短缺的情况下，建立可交易的水权制度能够提高水资源在不同用水部门或用水地区的配置效率。
Under the situation of water scarcity, to build a tradable water right institution can improve water allocation efficiency among various water use sectors or regions.
在水资源短缺的情况下，建立可交易的水权制度能够提高水资源在不同用水部门或用水地区的配置效率。
Under the situation of water scarcity, to build a tradable water right institution can improve water allocation efficiency among various water use sectors or regions.
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