BOSS HEC-RAS is based on the U.S. Army Corps of Engineers?HEC-RAS water surface profile model used for modeling both steady and unsteady, one-dimensional, gradually varied flow in both natural and man-made river channels.（HEC-RAS 公司开发的功能强大的软件，可以用于均匀、非均匀流，一维，缓流的人工渠道和天然河道）