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How do you set up an EPS (Extended Period Simulation) scenario for fire flow that would run for a certain amount of time?
To look at how flows and levels change over the course of a long duration fire, set 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.
Note:
WaterGEMS "Fire flow analysis" calculates the water that can be delivered to a node for fire fighting at one point in time (steady state). Therefore, an extended period simulation (EPS) does not apply and cannot be run with this tool.
By setting the calculation option "Is EPS Snapshot" to True, the fire flow analysis will consider the starting date and time and apply the appropriate pattern multipliers for that time. However, this is still a steady-state analysis.