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Stormwater Drainage Subcatchment characteristic width & Slope

Greetings,

We are working on Urban drainage design using SewerGEMS latest version of 10.03.04.53 with Explicit solver & EPASWMM runoff method.
In which the catchment characteristic width & slope are inputs to the model (shown in below screenshot). Is there any possibility to calculate the Catchment characteristic width & slope in SewerGEMS.
Could you please explain about these inputs and how it facilitates the runoff flow & volume.

Regards
Ganesh Bala S

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  • To add to Sushma's reply - generally speaking you can see a short description of input fields by clicking on them in the Property grid and looking at the bottom. See: Where can I find the definition of a property?

    As Sushma mentioned, these particular inputs are based on the standard EPA-SWMM runoff method and are needed in order to compute the runoff hydrograph. You can see more information specifically about SWMM runoff in chapter 3 of the Hydrology manual (download found on this page)

    If you're still not sure how to determine these parameters, you may want to consider if this is the right runoff method for you. Your local reviewer may require a certain runoff method, and you may find that the Unit Hydrograph method for example may be better, especially if it's required parameters and storm information are more readily available to you.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply
  • To add to Sushma's reply - generally speaking you can see a short description of input fields by clicking on them in the Property grid and looking at the bottom. See: Where can I find the definition of a property?

    As Sushma mentioned, these particular inputs are based on the standard EPA-SWMM runoff method and are needed in order to compute the runoff hydrograph. You can see more information specifically about SWMM runoff in chapter 3 of the Hydrology manual (download found on this page)

    If you're still not sure how to determine these parameters, you may want to consider if this is the right runoff method for you. Your local reviewer may require a certain runoff method, and you may find that the Unit Hydrograph method for example may be better, especially if it's required parameters and storm information are more readily available to you.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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