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工程设计中经常采用设置汛期防洪限制水位，减少专用防洪库容；在满足水库本身及下游防洪安全的前提下，使防洪库容尽量与兴利相结合，即汛期利用部分兴利库容防洪，这部分库容为防洪与兴利共用，称为重复库容（亦称结合库容）、重复库容汛后恢复为兴利库容，以达到减少投资提高综合利用效益之目的。防洪库容与兴利库容是否结合和结合多少，不仅取决于水库的调节能力、洪水特性及河川径流的变化规律，而且还是一个技术经济问题，要经过分析比较后才能确定有利方案。
In engineering design, the flood control flood limit level is often used to reduce the special flood control storage capacity. Under the premise of meeting the reservoir itself and the downstream flood control safety, the flood control storage capacity should be combined with the development and utilization as much as possible, that is, For flood control and sharing of interest, known as the repetition of storage capacity (also known as the combination of storage capacity), recovery of storage capacity after flood recovery Xingyu storage capacity in order to reduce investment to improve the comprehensive utilization efficiency purposes. It is not only the regulation of reservoir capacity, flood characteristics and the variation of flood runoff but also a technical and economic problem that the favorable combination can be determined only after analyzing and comparing.