Is there a way to check residual pressures at a hydrant or other node for a range of flows?
With normal base demands entered for your model nodes, you can right-click on a hydrant or junction and choose "Hydrant Flow Curve". This will generate a curve of flow versus pressure. 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.
1) During the Hydrant Flow Curve calculations, logical and simple controls are not accounted for. With automated fire flow, simple controls can be accounted for.
2) In addition to being able to display multiple fire flow tests at once, automated fire flow will also allow you to more easily report additional details. For example, automated fire flows can account for zone pressure constraints and system pressure constraints.
WaterGEMS and WaterCAD Automated Fire Flow FAQ
Understanding Automated Fire Flow Results
Junction vs Hydrant