CivilStorm peak flow for multiple catchments (hydrology)


I'm trying to set up a simple network of my basins and outfalls. My end goal is to see what the basins are putting out for flow for different storm events.

There is no pond.

In one instance I have three basins flowing to the same outfall. I can't get CivilStorm to combine the hydrogrpahs and tell me the overall peak flow for those three basins combined. I'm using the SCS CN / unit hydrograph method.

I just want something simple-- can I create a "dummy" node to attach these catchments to and get a combined flow? I've tried "outfall", "ponds", and even other "catchments" with no success so far.

I want a purely hydrological model, no storm sewers involved.