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Check the CN values that you have assigned. If the value is too low, then all of the rainfall can be captured as infiltration and nothing will be translated into runoff.
Also, when using EPA SWMM hydrology method, it is important that you properly define the "equivalent width" value that is defined for each subbasin. This has a big impact on the computed TOC.
If you continue to face problems with your model, you can send it to our technical support engineers.
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