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Autodesk
Status Gathering support
Product InfoWorks ICM
Categories Hydrology
Created by Andrew Augustine
Created on Apr 17, 2025

Add LA County Modified Rational Method Functionality

It would be beneficial to have the ability to generate hydrographs using LA County's Modified Rational Method, similar to XP-SWMM. This would allow consultants to use ICM on LA County projects.

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  • Admin
    Samer Muhandes
    Nov 26, 2025

    Thank you for taking the time to raise this and thanks to those who voted.

    I am moving the status of this to "Gathering Support" so we gauge the interest from the wider ICM community.

  • Robert Dickinson
    Apr 17, 2025

    Hello Andrew, I remember from xpswmm days that there were a lot of South California methods. Do you have a link to the current version you think is the best? https://dpw.lacounty.gov/wrd/publication/engineering/2006_Hydrology_Manual/2006%20Hydrology%20Manual-Divided.pdf