I would like to know whether it is possible to model hydrology for urban catchments using a source term within HEC-RAS 2D. Feedback is highly appreciated.
There seems to be a 2D boundary condition named “Precipitation”, which may be applied to a flow area (p.94, http://rivergis.com/docs/2D_Modeling_with_HEC_RAS_50.pdf) using an excess rainfall timeseries. That looks promising.