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# RE: Pumpstation+Storage pipe

Hi

In the following captured, I included plan and section of a given stormwater pump station to evacuate water from wet well to a river from level 0.0 m to level 10 m.

I need to have the required volume of wet well for a given hydrograph.

I drew manhole, pipe , wet well, pump, pressure pipe and an outlet in SewerGems.

Aso,as you mentioned before, I input the 5-year event hydrograph in the node (manhole).

1- How can I have volume required of wet well based on the hydrograph and pump discharge 2 x 0.2 m3/s.

2-Is it possible to have volume stored in the pipe in the different level form level 0.0 to level 2m?

This project should be done based on " HEC24, stormwater pump station guideline" and I should follow that book.

Regards.

Hamid

• Hello Hamid,

I'm not familiar with the guideline you mentioned but I'm confident you'll be able to use SewerGEMS to model this system.

1) When you mention a flow of 0.2 cms, is that a constant flow out of the pump, the peak flow when the pump turns on, or something else? Typically pumps will turn on and off based on the level in the wetwell. So, the smaller the wetwell, the more frequent the pumps will be cycling. Therefore it may help to explain a bit more about the criteria for selecting a wetwell size. Generally speaking, you would enter a reasonable size in the model, compute, assess the results and resize as needed.

2) When you say "to have", are you asking if there is a way to report the volume? This is not a result field for a conduit but you can view the profile to see the water surface and pipe depth. Again, it would help to provide a bit more information on why this is needed.

Though it may not be necessary, if the storage pipe is relatively short and you don't need to asses it's capacity or a typical gradually varied flow profile, you could potentially combine the volume of the wetwell with the volume of the pipe into a single storage node. In the wetwell properties, choose either "Depth area" or "variable volume" as the "Section" type. You'll then be able to enter the Depth-Area or Depth ratio to volume ratio curve of the wetwell .You could account for the combined volume of the wetwell plus the pipe at each "stage" (vertical increment). Again, I would only consider this if absolutely necessary, but I wanted to mention it as an option.

Regards,

Jesse Dringoli
Technical Support Manager, OpenFlows Products
Bentley Systems, Inc.

• Hi

1-yes. pump flow rate is constant 0.2 cms.

2-for the guidline see the following link:.

3-as the following table shows, I need to provide a table to show volume stored in the wetwell and storage pipe for different elevation with interval 0.1m.

this help me to calculate the switching table (elevation)

Thanks

Hamid