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在三峡水库建成后，防洪库容可达２２１．５亿ｍ３。若遇１９９８年洪水，利用三峡水库，进行简单的防洪补偿调度，合理利用防洪库容１９０亿ｍ３，即可达到控制沙市水位不超４５．００ｍ、城陵矶（莲花塘）水位不超３４．４０ｍ的目标，从而极大地减轻长江中下游的防洪压力。若充分发挥水文预报的作用，加强科学预报，防洪效果则更佳。
After the completion of the Three Gorges Reservoir, flood control capacity can reach 22.25 billion m3. In the event of the 1998 floods, the Three Gorges Reservoir will be used for simple flood control and compensation and rational utilization of 19 billion m3 of flood control storage will be able to control the water level of Shashi not exceeding 45.00m and the water level of Chenglingji (Lotus Pond) not exceeding 34.40m So as to greatly reduce the flood control pressure in the middle and lower reaches of the Yangtze River. If we give full play to the role of hydrological forecasting and strengthen scientific forecasting, the flood control effect is even better.