Greetings Bryan and all, I  have never made any geyser models so take what I say with a grain of salt.  In fact, all this answer is really opinion, not fact.  But I have to  wonder if one of the reasons your models don't quite behave like geysers is that you are using a point heat source.  Geysers get their heat from the rock the water filled cracks are in.  There  is a heat gradient from deep in the earth above the Magma to the surface, so to mimic a geyser more closely you would have to heat the beakers and the tubing, and provide more heat at the bottom of the system with less at the top.  I suspect this heat gradient is different in each geyser field, so some geysers start their eruption high in the system because that is where the vapor pressure of the water finally exceeds the water pressure.  Others first have the vapor pressure exceed water pressure deeper in the system so the eruption starts deeper  in the system.  So it is theoretically possible to class geysers by the the depth at which the eruption starts,  but since so far we can't prove what depth the eruptions starts at that the classification is mostly theoretical.  As for geyser behavior, I think that if the eruption started deep in the system you would first see a rise in the pool or heavy water overflow (pushed out by the  deeper eruption) and perhaps a gradual rather than sudden start to the eruption.  Geyser that would fit in this category would be Fountain, Artemisia, Oblong, and Giantess.  For smaller geysers, perhaps Big and Little Anemone and  Solitary could be included.  I am sure there are other geysers that could be listed also.  It is interesting to think about. Stephen Eide <hr>Msg sent via CableONE.net MyMail - http://www.cableone.net