A famous result says that the total amount of water flowing is equal to the minimum cut.

v.net.flow input=roads output=roads_flow cut=roads_cut afcolumn=SPEED source_where="type=factory" sink_where="type=store"

If all the capacties are one then the minimum cut corresponds to the minimum number of edges separating sources from sinks.

v.net.flow input=network output=flow cut=cut afcolumn=ones source_cats=1-10 sink_cats=100-100

Wolf Bergenheim, Mentor

*Last changed: $Date$*