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Available Fire Flow In Model vs Field Tests

Hello,

I put a model together that is giving me wildly large available fire flows from the hydrants in the system. The city we are providing services for have provided us with a spread sheet showing significantly lower flows from those hydrants. 

Here is an example:

NW_115 in model is giving an available flow of 4,000 gpm (upper limit for the model is 4,000 gpm).

NW_115 in the field is giving an available flow of 2,255 gpm.

All hydrants are discharging from 2 inch orifices'

Is there something in my model that is set incorrectly?

Please help. How do I upload a file that is 9.5 MB?

Thanks,

Clint Taylor, EIT