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Should a Wetwell be included in the Water Distribution System when Sizing the Elevated Storage Tank?

Should we include a wet well and the distribution pump control setting for the wet well, in order to determine

  • If the current system can provide the future larger demands
  • To size the Tower for the future

I recently worked on a model project for a City for a future scenario for a larger population. 

As usual for what I have seen set up for a City with a Water Treatment Plant (WTP), the water distribution system (WDS) model had a reservoir and pumps, which represented a WTP.  For the future maximum day and hour demands, the pumps were supplying enough water to provide sufficient fire flow and pressure.  However, because the reservoir can supply unlimited amount of water, I had to analyze the model results separately using a spreadsheet.  

Then, I wondered when a model is used for the above purposes, if we should include a wet well in a WDS model.  If we include a wet well in a model, we can see when the distribution pumps (high service pumps) start and stop with higher demand and how the water levels in the tanks fluctuate.

I'd appreciate sharing your expertise and comments on this.

Thank you.

Yoko

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