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  • Users: ewbeng
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  1. ewbeng

    Methods to determine pre- and post-runoff volumes

    I am trying to determine the pre- and post-development runoff volume for the 25-year, 6-hour storm (per City requirements). Note, this is a very small project - they are proposing to add 2,067 sf of concrete and 2,624 sf decomposed granite to a 13,685 sf area (existing lawn). The City...
  2. ewbeng

    Graphical Peak Discharge Method for 25-year, 6-hour storm

    I am trying to determine the pre- and post-development runoff volume for the 25-year, 6-hour storm (per City requirements). I've brushed up on the various methods and would like to use the Graphical Peak Discharge Method. Where I get confused (and maybe I've selected the wrong method) is the...

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