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How to develop a pump curve for a well pump when the only information I have is the well capacity(MGD)? [WaterGEMS]

I have a model for a city(In WaterGEMS) with multiple Groundwater/Surface Water/Repump stations. Apparently, one of the Groundwater well pump has incorrect pump curve (head vs flow).

I need to develop a new pump curve with the only info on hand being the well capacity in MGD units. The last person who modeled this system made the pump curve thought that the capacity the of well was 0.9 MGD instead of 1.9 MGD.

Unfortunately, going to the field to gather info about the pump is not an option.

Thanks.