Junctions not appearing in HEC-RAS after creation in HEC-GeoRas

FraserMorgan

When I export RAS files from ArcMap 10 to HECRAS and I do not see junctions in the Hec RAS geometric data editor, even though the attribute table for the stream line shows the correct to and from nodes. However the ToSta and FromSta columns appear to be listed incorrectly (ToSta is just the length of the reach and FromSta is always 0)

Based on another answer on a similar aspect on this forum, I have completely double checked that the river junctions are in the correct direction and are correctly snapped (I used 'end' sapping tool used rather than 'vertex' snapping if this makes any difference).

I also tried using the 'move object' tool in the Hec RAS geometric editor to overlap tributaries, however no junction appears in the geomery viewer or propagated into the steady flow boundary conditions editor.

Does anyone have any suggestions as to why this is the case and/or how we can create junctions that are recognized by HEC-RAS?

Appreciate any help anyone can provide.

Fraser

MattMead

You wouldn't happen to be working with only 2 stream reaches would you?  If that is the case RAS requires three streams to make a junction.  Some of what you wrote(Snap to end, move object didnt work) makes it sound like you have two streams that come together end to end and you want to make one long reach with distinct names/river stations.  If that is indeed what you want to do you need to make a dummy reach and use that to make the junction. 

If you are trying to combine three streams, try making three separate lines in the River file if you havent done that already.  Failing that though, I am at a loss.  Move object should always split the reach as long as there are cross sections on either side of the junction.