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编者按黄河中下游设计洪水是编制黄河下游防洪规划及安排防洪工程的重要依据，关系到黄河下游的安危，事关重大。当前黄河干流修建了数座骨干工程，支流及面上也修建了一批中。小型水库及水保工程，如何认识这些工程修建后对黄河设计洪水产生的影响，是当前大家关心的热点问题
Editor’s note The design flood in the middle and lower reaches of the Yellow River is an important basis for compiling flood control plans and arranging flood control works in the lower reaches of the Yellow River and relates to the safety of the lower Yellow River. At present, several backbone projects have been constructed in the mainstream of the Yellow River and a number of tributaries and surfaces have also been constructed. Small reservoirs and water conservancy projects, how to understand these projects after the construction of the Yellow River floods, the impact of the current issue of concern to everyone