建在山区浅滩河流上的一些拦河坝，经常遭受洪水毁坏。1991年黑龙江省海林市因遭受近二十年一遇洪水，流量为3100立方米每秒的冲击，全市51处拦河坝中就有43处遭到不同程度的水毁，其中有39处在坝头滩地拉开形成河道。分析其破坏的主要原因：一是这些拦河坝均处于山区冲积平原 Some of the barrage structures built on the shoals of mountainous mountains are often damaged by floodwaters. In 1991, Hailin, Heilongjiang Province, suffered a flood of 3100 cubic meters per second due to floods in nearly 20 years. There were 43 waterclosures in 51 of the city’s dams being damaged to varying degrees, of which 39 were in dams Head and shoulders open to form a river. Analysis of the main reasons for its destruction: First, these barrage are in the alluvial plain