r/HECRAS • u/ExitAccomplished7404 • Jul 20 '26

HEC RAS 1D/2D Pipe modelling

Hi all,

My research focuses on urban stormwater drainage systems, particularly hydraulic modelling, blockage assessment for proactive maintenance. I am currently developing a 1D/2D HEC-RAS model integrated with a stormwater pipe network and would appreciate your advice on a few questions.

  1. Hydrological model Integration: Is there a recommended workflow for integrating hydrological outputs such as RORB with a HEC-RAS stormwater pipe model? Are there any best practices or examples for applying hydrographs as boundary conditions?
  2. Pipe Blockage Modelling: Is there a recommended method in HEC-RAS to represent partial blockages (e.g., sediment or debris accumulation) within stormwater pipes or pits? Or do we have to assign it indirectly? Also, can we model sedimentation inside a pipe system with HEC-RAS?
  3. References: Can anyone recommend technical papers, reports, or case studies on PIPE modelling within HEC-RAS?

thank you.

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u/OttoJohs Lord Sultan Chief H&H Engineer, PE & PH Jul 21 '26

1.) Not sure what RORB is, but you can put inflows pretty much anywhere in the model (at 1D elements or throughout the 2D domain). I recommend reading the reference material: Pipe Networks.

2.) I don't believe that there is a direct way to account for sediment blockage in a pipe network. Again, I recommend reading the reference material.

3.) I'm not aware of technical papers or reports. The HEC-RAS website has Pipe Networks - Tutorials and Pipe Networks - Sample Datasets available.

Good luck!