Sim, It looks to me like all nodes have a HGL of 10m. Based on that, would you conclude that the "HGL of a Junction that has a positive Demand is equal to HGL of lowest Tank or Reservoir of the network"? Obviously not. So it looks like there is some other cause here. Why not try adding a negative demand to another model to see what happens? Or, why not try making the negative demand in your model big enough to cause some significant velocity in your pipes. Then you might get a better understanding of this. Regards, Mal
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