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How do you set up an EPS scenario for fire flow that would run for a certain amount of time?
You could do this by setting up an EPS simulation that uses a pattern to peak the demand at whichever hydrants or junctions you'd like to run the fire flow on. Quick start lesson #2 "Extended Period Simulation", which can be found under Help > WaterGEMS Help > Contents > Quick Start Lessons explains how to set this up.
The screen shot below shows how you might set your pattern up of you were running a 3 hour fire flow at 2,000 L/min from hours 18-20 from your simulation start time.