长江是一条雨洪性河流，洪水频繁，千百年来依靠堤防御水，受到洪水的严重威胁，尤以荆江为甚，而荆江防洪长期面对的却是上游洪水来量大与堤防安全泄量小的矛盾。在今年7—8月主汛期，长江流域暴发全流域性特大洪水，荆江河段首当其冲，水位屡超历史记录。8月17日沙市水位达到 The Yangtze River is a flood-prone river with frequent flooding. It has been threatened by floods for thousands of years, especially by the Jingjiang River. Flood control in the Jingjiang River has long been confronted with large flood volumes and dike-venting A small amount of contradictions. During the main flood season from July to August this year, the Yangtze River Basin triggered a grand flood in the whole basin. The Jingjiang River section bore the brunt of the flood and the water level repeatedly exceeded historical records. August 17 Shashi water reached