Hello Bentley,

I created stormCAD model for pipe design.In my model there are few channels where I need to design infiltration trenches.I saw LID under SewerGEMS can do that.However, I have few questions.


Can I import same model in sewergems including same setup with rational flow to design infiltration trenches or I have to use SCS method.

Please find the following attachment.

Thank you,


  • Hello Hari, 

    The mentioned file is not attached herewith. 

    Please note that GVF-Rational solver does not support design of low impact development elements. LID works with implicit - dynamic solver.

    And rational runoff method is applicable only with GVF-rational solver, so you may not be able to use it with Implicit solver and LID. You can use SCS method / modified rational method or other options of runoff method. 

    Low Impact Development (LID) 


    Sushma Choure

    Bentley Technical Suppport