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Is there an easier way to check residual pressures at a hydrant (or other location) for a range of flows?
Yes. With normal base demands entered for your model nodes, simply right click on the hydrant or junction and choose "Hydrant Flow Curve". This will generate a curve of flow versus pressure. Basically, it will run several steady state simulations with various demands on that node, reporting the pressure at the node for each one. For example, if you wanted to see how much flow could pass at 20 psi, you could simply look up the flow for 20 psi on the hydrant flow curve.