1 水资源分配和水权体系的必要性　　概述　　与其他资源不同，水资源是一种可由降水来补充的可再生性资源。降水补源往往是不规律的，有些供水可能是以远远超出可补充的速度抽取地下水来实现的。随着供水需求的增加和水资源短缺的出现，水资源管理越来越重要。有效的管理政策 1 The Need for Water Allocation and Water Rights System Overview Unlike other resources, water is a renewable resource that can be recharged by precipitation. Precipitation sources are often erratic and some water supplies may be achieved by extracting groundwater well beyond replenishment rates. With the increasing demand for water and the emergence of water scarcity, water resources management is increasingly important. Effective management policies