Note: Flow Units In InfoSWMM may be different then the Output Link Flow Units
The flows units selected in Run Manager determines the flow units of all incoming units including DWF, Inflow Time Series and other features in pump curves and other curves. The output unit manager determines what you see when you make a graph of the link flow. For example, you can have dry weather inflow of CFS and output units of GPM or MGD if you so request and set the correct flags in the interface.
via Blogger http://www.swmm5.net/2013/07/flow-units-in-infoswmm-may-be-different.html