Welcome to the RAS Solution › Forums › HEC-RAS Help › 90 degree turn canal with culverts

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  • December 14, 2013 at 4:23 am #5434
    Anonymous
    Guest

    I am trying to model a canal that runs north south for 200 ft and 1200ft west east. The project consists of addinga small culvert to the north south section, then it goes through a box (simulates a manhole) and then box culvert of approximately 980ft, thin we have another box that will connect the culvert to 3 existing circular pipes that discharge to another box culvert.

    I am having problems modeling the boxes and the turn. I am importing the reach as a surface form civil 3d as GISData. Do you have any suggestions on how to proceed and what would be the best way to go about this model. I will really appreciate any imput on the matter.

    December 24, 2013 at 10:58 pm #8689
    Chris G.
    Keymaster

    Keep in mind that culverts in RAS are not meant to model tunnels or pipe systems. They are meant for your typical road or highway crossing culverts. That being said, there is no limitation to the number of culverts or length of culverts you can have in your model. BUT, a single culvert cannot have a change in it’s shape, slope, or other basic geometric/hydraulic characteristics. 90 degree turns are no problem in HEC-RAS, just keep in mind that turns are purely geometric-they do not factor directly into the computations. If you want to account for energy losses due to bends (or turns), you can only do this through adjustments to Manning’s n values or contraction/expansion coefficients.

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