The flood diversion capacity of watercourse at the lower reach of a reservoir concerns submergence of the upper reach of the reservoir and the safety of reservoir itself.

• 水库下游河道行洪能力不仅涉及水库上游淹没和水库安全,对水库下游河道堤防、城镇和村落的安全造成的潜在危险也是最需要考虑的因素。