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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.

  • Hello Varenya,

    I assume this is an existing pump. 

    When you say that you know the well capacity is 1.9 MGD, does that mean it can produce a maximum of 1.9 MGD without significant drawdown, or is that the flow that you want to assume is being pumped out of the well when the pump is on?

    If you can estimate the head that the pump adds at 1.9 MGD, you could use that with the single-point (design point) pump curve type: Understanding the "Design point" (1 point) pump definition type

    If you do not know the head, you could consider using the steps in the following article to determine the head needed to be added at that given flow: Estimating a pump curve for a model This could be complicated if there are other pumps manifolded in, downstream.

    Another approach would be to simply model the pump/well as a junction with a negative demand, set to 1.9 MGD. This may not reflect the true system performance though, and you'd need to use a demand pattern with a series of "1" and "0" to model the "pump" turning on and off. See: Modeling an inflow (negative demand) in WaterCAD or WaterGEMS


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.