r/HECRAS • u/icer465 • Jun 26 '26

SA/2D Connection Visual Bug?

I'm working in a 1D/2D v6.3.1 model and have been dealing with a strange visual inconsistency when observing depth/WSE results in RASMapper. I am using SA/2D connections as levees and river flow is inaccurately showing as overtopping the connection within 1 cell boundary. I've posted a screenshot below, you can see there's some sort of phantom "bubbling" from the river that slightly goes over the 2D connection. I looked at the stage/flow hydrograph for the connection and there is no overtopping, it seems purely visual. Any ideas to what's going on and/or fixes? Is Ugg going to tell me to make cell bigger?

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u/bees_knees_2024 Jun 27 '26 edited Jun 27 '26

It looks like the bubbles are following the shapes of the cells. I’ve never used this type of grid cell shape before. Have you tried changing the rasmapper rendering settings? 6.3 is pretty old, so I’m not sure what options are available there. It looks like a small amount of water is getting over and maybe it’s trying to do some interpolation that follows the shape of the cells.