Sizing dewatering pump from runoff calculations

[dreed218]

How do you size a dewatering pump once you have the site runoff calculations for the corresponding watershed? I need to size a pump for a 100-year event in order to prevent a flooding condition into a building. I have assumed a 5 minute tc value (watershed is small) for a 100-year rainfall intensity and gotten a flow rate. How do I then best size the pump using this calculation? Do I need to use a different tc value in my runoff calculations to get something more appropriate to size the pump in gpm? Assume minimum to zero sump volume at the pump.

Any help would be greatly appreciated. Thanks!

 

[psmart]

Unless you have enough storage to attenuate the peak, your pump will need to be able to handle the peak runoff, otherwise the pump chamber will.overfliw.

Peter Smart
HydroCAD Software

http://www.hydrocad.net