世界上大部分大河的水力资源都可同时用于发电及其他的目的,如:灌溉土地,河运、城市和工业企业的供水、养魚以及其他等等。在某些情况下,若天然的徑流条件会造成很大的水灾,尤其是带来不可抵抗的水灾时,建造水工結構物还有防洪的目的。在設計和研究水力资源的各个阶段中,特別是在确定所謂“經济”(“实际被利用”的或“工业上的”)水能资源时,应該考虑河川綜合开发的合理性。 Most of the major rivers in the world are hydropower resources that can be simultaneously used for power generation and other purposes, such as irrigation of land, river transport, water supply to urban and industrial enterprises, fish culture and others. In some cases, if the natural runoff conditions cause great floods, especially in the case of irresistible floods, the construction of hydraulic structures also has the purpose of flood control. The rationalization of integrated river development should be considered in all phases of designing and studying water resources, especially in identifying so-called “economic” (“actually utilized” or “industrial”) hydro-energy resources.