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许多水电站建设许可证持有者认为可能最大洪水是评估具有重大风险的大坝溢洪道容量的唯一标准。然而,在某些情况下,较低的洪水标准也是可以接受的,如果许可证持有者能证明采用较低标准对生命与财产的损失没有导致更大的风险。美国联邦能源管理委员会制订的流程图示出了这一做法。
Many hydropower construction permit holders consider the maximum possible flood as the only criterion for assessing the spillway capacity of a dam with significant risks. However, in some cases, lower flood standards are also acceptable if the permit holder can prove that applying lower standards does not result in greater risk to life and property losses. The flowchart developed by the Federal Energy Regulatory Commission shows this.