When a 2D mesh is created, recomputing the mesh has an "unknown error" on the bottom left. The Mesh Status on the 2D Area Editor reports an arithmetic overflow message.
Global Simplified Channel Evolution Model in 1D Sediment is not working
The simplified channel evolution model (used for eroding reservoir sediments for dam removals, dam failures, and flushing) is not working in version 6.6.
Sediment Rating Curve Tool Stopped Working
The USGS decommissioned the water quality data that HEC uses for this tool. Users can no longer download data from the USGS. If you have the gage number, you can now download data for the gage site.
2D Perimeter Polygon Disappearing
The polygons for the perimeters of 2D areas are disappearing in unique cases. Symptoms you might notice are that the mesh does not update when adding new points in an edit session, the polygon is not selectable in Mapper, or simulations failing during Writing Geometry stage.
Model Compare Tool
Model Compare tool may crash when comparing older results. Various other small issues.
2D Flow Area Mesh error message
Newly created meshes reporting "Unknown Error" until an editing session is stopped and saved.
Delete of Current Plan Results data when deleting another Plan
When deleting old Plans (#.p02, for example), model results for the currently open in the interface Plan (#.p01.hdf, for example) will be deleted along with #.p02 (#.p02.hdf will not be deleted).
SA/2D Connection Data plot crash
SA/2D Connection Data plot in RAS Mapper crashing if there were gates
Copy/paste in RAS Mapper
Copy and paste in RAS Mapper not now pastes profile (station-elevation data) columns
Pipe Nodes geometry crash
Deleting all pipe nodes in a geometry would result in software crash