A fire flow result of 1500 L/min means that 1500 can be delivered to that node in the system. Conservatively, the means that you will get at least 750 L/min at each hydrant although (if hydrants are available), you probably will be able to get more depending on how far they are separated. The WaterGEMS fire flow analysis is intended to give the overall strength of the system for fire flows, not the specifics of how you would fight a fire at each building, because you really don't know the kind of pumper truck, the fire hoses and nozzles that will be used in an actual fire. If you want to know exactly how much flow you will get out of a hydrant at a specific residual pressure, you can model each hydrant as a reservoir with the hydraulic grade set to the residual head and see how much water goes to each resrvoir. I believe we have several items in the Knowledge Base about this..
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