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How does the Automated Fire Flow analysis work?
The automated fireflow analysis routine will perform a series of independent steady state calculations, with the various extra demands applied to your fireflow nodes. It first runs a steady state analysis on the scenario in question, with the "needed" fireflow applied only to one of your fireflow nodes. It checks the resulting pressure at that node, at other nodes in the same zone and (if desired) pressure at all other nodes in the model and velocities in the pipes. If these are within the constraints specified in your fireflow alternative, it will add a little bit more demand to that node, check the pressures, and repeat, until the pressure constraints are violated or the demand reaches the "upper limit" that you specify. Then it reports this "available" fireflow and moves on to the next fireflow node, performing the same steps.
If you are looking for step by step direction on how to setup the automated fire flow analysis please refer to the quick start lesson titled "Automated fire flow analysis" that is located in the help documentation that comes with the software (Help > Quick Start Lessons).
Understanding Automated Fire Flow Results
WaterGEMS V8 Automated Fire Flow FAQ