本文以辽宁省辽河流域为例，对流域防洪体系效果进行评价研究。
The paper takes LiaoHe river basin in LiaoNing province as an example and conducts the effect evaluation of flood control system.
防洪体系系统风险评估方法研究是当前几个难点和关键问题之一。
The systematic risk evaluation of flood-control system is one of the most difficult and important issues in the domain of flood-control study.
由于防洪体系组成部分的风险程度各异，综合的系统失事率难以评估。
The systematic failure probability of flood-control system is difficult to evaluate because there is much difference among the risks of components of the system.
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