Hello,
I have an existing model from Urban Drainage (a governmental agency) with the lower end of the Left Hand Creek. I need to add new cross sections along the project I am working on. After I create the alignment on a portion of the creek, I created the sample lines where I want new cross sections. I was able to export the alignment and the sample lines to HEC RAS from AutoCAD Civil 3D. However, when I import into HEC RAS the only option I have is to replace the reach. Basically the reach is not the whole length anymore but the length of the alignment that I drew on the AutoCAD civil 3D. Any idea how I can import the sample lines but leave the reach as it is on the existing model?
Thanks in advance for any assistance,
Ileana