HEC-RAS Release Notes Current: Resolved Issues PDF Download PDF Download page Resolved Issues. Current page All pages Resolved Issues 22 Jun 2023 HEC-RAS 6.4.1 releasedMajor IssuesCreating new RAS Terrain May Add 1.0 To Terrain ElevationCreating a new terrain in RAS Mapper will sometimes add 1.0 to the elevation values. Courant Map Not Plotting In 2D Areas In RAS Mapper.Plans that were ran in 6.4 will not show courant values in 2D Areas. Difference Plot for Floodway Encroachment AnalysisThe Difference Plot for Floodway Encroachment Analysis will not plot for multiple reaches at one time. ×