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EPANet Confirmation of Fire Flow Test Results

EPANet Confirmation of Fire Flow Test Results

EPANet Confirmation of Fire Flow Test Results

(OP)
As a part of evaluating a switch from WaterWorks to EPANet for our water flow modeling software, I am back-checking some of our former reports to both make sure that EPANet gives comprable results and to make sure that I know how the software works.  But, I've been running into a snag.

I'm trying to model an existing commercial site we are designing an expansion for.  While our field fire flow test was performed at a relatively hydrologically remote area (but directly adjacent to the building utility entries), we were able to model the building supplies and fire flows at that point in WaterWorks.  However, when I try to re-create the model in EPANet, I can't get the model to confirm the fire flow data.  I have tried modeling a pump on the system based on the supply data and moving the pump in an attempt to confirm the results.  Also, I've tried using reservoirs off-site with sufficient head to supply the measured static pressure.  Neither of these techniques have worked.  When I run the model with the test parameters (flowing at two test hydrants and measuring the pressure at the residual hydrant), the modeled pressure is 8 to 10 psi higher than the tested pressure.

Is there a way to force EPANet to model the pressure versus flow relationship we obtained from the field fire flow test?

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