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淮干中游沿河两侧共有21个行洪区,其中河南境内3个,安徽境内18个。它们地势低洼,各自有不同高程的堤防或与岗地封闭、或自成堤圈。在行洪水位之下保护着行洪区内105万亩耕地不受水淹;而在汛期淮干高水位时,按不同的规定高程陆续开放使之行水,以增加淮河的排洪量。近年来,淮干中游行洪区特别是正阳关以上的行洪区运用频繁,给行洪区内群众生产带来了较大困难。许多人对淮干中游为什么要开辟行洪区很不理解。行洪区到底有什么作用?要回答这个问题,先得从淮河的自然特征谈起。
The middle reaches of Huaihe River has a total of 21 floodplains on both sides of the river, including 3 in Henan Province and 18 in Anhui Province. They are low-lying, they have different levels of embankment or post closure, or since the embankment circle. Under the flood level, 1.05 million mu of arable land in the floodwaters area is protected from flooding. In the flood season, when the high water level of the Huaihe River reaches high levels, different levels of regulation will be gradually opened up to allow water to flow in order to increase the flood discharge of the Huaihe River. In recent years, flood and floodplains in the middle reaches of the Huai River, especially those above Zhengyangguan, have been frequently used, which has brought great difficulties to mass production in floodplains and floodplains. Many people do not understand why the middle reaches of the Huaihe River should open up floodplains. What is the role of floodplain in the end? To answer this question, we must first talk about the natural characteristics of the Huaihe River.