If you don't have a defined pump curve, is it more accurate to use a negative demand at a junction or a one point pump curve?

I am trying to represent a pump that I do not have a pump curve for. I have one person advocating for simply using a negative demand but I am afraid this won't capture the actual pump performance as determined by the system conditions that will vary. Rather, I am thinking it would be more appropriate to use a one point design curve that has been somewhat "calibrated" to match hydrant tests/system pressures. Which would be the correct or more accurate way to do this in WaterCAD? 

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