一旦出现溃坝，必将威胁下游水库的安全。
Once the upstream reservoir breaks dam, the downriver dam will be threatened.
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。
When there exists reservoir upstream, whose standard for flood control is lower then that in downriver, the dam-break flood upstream must be considered.
在上游已建成具有一定调节能力的水库时，为减少下游拟建水库的施工导流流量，要求上游水库控制泄量以满足施工要求。
If a regulated reservoir was built on upstream, we always reduce construction flood to meet the requirement of the hydropower project downstream through controlling the outflow of reservoir upstream.
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