I was wondering, if it is justified to say, that gas distribution network graphs (primarily in Europe) are typically tree-like. By gas distribution networks I mean municipal and regional distribution networks, not the long-range transport networks. To me, it would seem reasonable, since alternation of flow direction makes little sense, given that there are few sources and mostly sinks in the network and establishing circular flows would be a waste of energy. Does anyone have experience with that?
Cheers, Tobi