安徽地处淮河中游,两岸支流众多,源短流急。淮河上游比降约为万分之五,而中游平均仅为万分之零点三。每遇暴雨上游洪水来势迅猛,进入安徽后,河道泄洪能力小,流速突然减慢,水位拾高,持续时间长,上游的治理标准要求越高,安徽的治理任务就越 Anhui is located in the middle reaches of the Huaihe River, with many tributaries on both sides of the Taiwan Strait. The Huaihe River upstream ratio dropped to about five ten thousandths, while the middle reaches only an average of 0.3 ten thousandths. Each flood event in the upper reaches of the heavy rain ravaged the flood in Anhui, the flood discharge capacity of the river was small, the flow rate suddenly slowed down, the water level picked up for a long time, and the higher the governance standards required by the upper reaches of Anhui’s governance task