在河道上建坝以后,天然水流的状态便发生了变化,水库区内河道水位将被壅高,影响到上游库区的淹没,必须进行水库回水计算,从而确定库区淹没范围、淹没损失与浸没影响。文章从陂下水库的实例出发,对回水曲线的原理、绘制以及应用方面进行探讨,以供同行参考。 After the dam is built on the river course, the state of natural water flow changes. The river level in the reservoir area will be excessively high, affecting the inundation of the upstream reservoir area. Therefore, the reservoir backwater calculation must be carried out so as to determine the inundated area of ​​the reservoir area and inundate the loss Effect with immersion. The article starts from the example of the sub-reservoir, and discusses the principle, drawing and application of backwater curve for the reference of peers.