Seasonal design flood should not only satisfy the flood prevention standard but also reflect seasonal variation characteristics.
分期设计洪水既要满足防洪标准，又能反映洪水的季节性变化特征。
2
When there exists reservoir upstream, whose standard for flood control is lower then that in downriver, the dam-break flood upstream must be considered.
当上游有水库，其防洪标准低于下游水库时，下游水库必须考虑上游水库溃坝洪水的影响。
3
The study of reservoir's standard for flood water on acceptable risk was brought forward, the dam evaluation framework of flood safety was established.