为了降低梯级弃水风险，提高水资源利用率，将起调水位范围、运行方式等作为梯级弃水风险控制指标，根据充分利用水库调蓄能力和洪水资源化利用的原则，提出了梯级水库常遇洪水弃水风险控制方法。该方法通过选取典型常遇洪水过程，结合梯级调度实际，迭代计算得出梯级水库弃水风险控制指标的合理范围，应用于乌江梯级水库的算例表明，计算结果对于制定梯级联合调度运行方式具有参考作用。

In order to reduce the cascade reservoirs surplus water risk and increase utilization of hydropower resources, this paper proposes a method to control cascade reservoirs surplus water risk for frequently-occurred flood according to the principle of making full use of the storage capacity of reservoir which has better regulation performance and flood-water resources utilization. The method treats the range of beginning regulation water level, operation mode and so on as the control indexes of cascade reservoirs surplus water risk. Using typical flood process, this paper got the reasonable range of the control indexes of cascade reservoirs surplus water risk with iterative calculation. The method is used on cascade reservoirs located on the Wujiang River. In addition, it shows an advantageous result for formulating cascade reservoirs operation plan.