内蒙古后套灌区长期普遍存在着排水沟边坡坍塌问题。1979～1981年,在灌区上、中游的二、四排干沟,通过野外调查、选段试验和观测研究,已取得一些行之有效的防塌经验。 After the irrigation system in Hougui, Inner Mongolia, drainage ditch slope collapse is widespread. From 1979 to 1981, in the middle and upper reaches of the irrigation area, there were two or four rows of dry ditches. Some effective anti-collapse experiences were obtained through field investigation, electoral test and observation.