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1999 年长江中下游发生了较大洪水,长江中下游干流沙市至螺山河段、九江河段及洞庭、鄱阳两湖最高洪水位均超过1954 年,其中沙市至螺山河段最高洪水位逼近1998 年的历史最高洪水位。在该年的防洪中长江中下游堤防工程发挥了重要作用,获得了巨大经济效益。依据有关实际资料对长江中下游主要堤防的防洪经济效益进行了粗略的计算与分析。
In 1999, there was a big flood in the middle and lower reaches of the Yangtze River. The highest flood levels in Shashi to Luoshan, Jiujiang, Dongting and Poyang lakes in the middle and lower reaches of the Yangtze River exceeded that in 1954, with the highest flood level in Shashi-Luoshan reach to 1998 The highest flood level in history. Flood control in the year in the middle and lower reaches of the Yangtze River embankment project has played an important role, access to great economic benefits. Based on the actual data, a rough calculation and analysis of the flood control economic benefits of the main embankments in the middle and lower reaches of the Yangtze River are made.