The model distinguishes between three different kinds of sources/sinks:
1. Isolated source; a point where a certain amount of water is discharged into the model, with a certain velocity. Both the continuity and momentum equations are affected.
2. Isolated sink; a point where water is discharged from the model. Only the continuity equation is affected.
3. Connected source and sink pair; used for e.g. AD recirculation studies. The amount of water removed at the sink point is reentered at the source point, with a specified velocity.
You may select up to 1024 sources and sinks. However only 512 can be defined by time series files.
The source and sink positions are specified by their horizontal grid coordinates, in their respective model area. The model area so specified should be the one with the finest grid resolution covering the geographical position of the source/sink.
Do not place the sources/sinks on land, and be careful when placing sources/sinks at locations that may occasionally dry out.