The effects of rivers, intakes and outlets from power stations, outlets from sewers, etc., can be included in a simulation. MIKE 3 distinguishes between three different kinds of sources:
· isolated source, a point where a certain amount of water is discharged into the model with a certain velocity, affecting both momentum and continuity equations,
· isolated sink, a point where a certain amount of water is discharged out of the model, affecting only the continuity equation, and
· connected source–sink pair, used for recirculation studies, the amount of water removed at the sink is re-entered at the source point with a specified velocity.
The sources and sinks are included in the hydrodynamic equations as described in Source and Sink).