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How can I model a storm event to get appropriate catchment runoff into my model, based on known rainfall precipitation data over a certain period of time?
If your rainfall data is in a supported format, it can be imported as a Rain File Storm Event. This is done by going to Components > Storm Events. Select the New icon and choose Rain File. Click the ellipsis (“…”) button next to the item “Rain File” on the right and browse to the rain file being used. Change the items “Rain Data File Type” and “Rain Units” as needed. In the table on the right, enter a label, the return event (in years), the Station ID (which should be in the rain file), and the time increment from the rain file.
Note that you would typically use the EPA-SWMM Runoff method for your catchments and the Explicit (SWMM) numerical solver, when using rain file data for a long term simulation. (see more below)
The following standard formats are supported for rain files:
Running a Long Term Continuous Simulation