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Please help with this Pond Elevation Control Structure

Please help with this Pond Elevation Control Structure

(OP)
Trying to design a control structure for the elevation of a pond.
Essentially, putting a box culvert at the bottom of the pond running inverted pipe 1,200 ft to the outfall structure. This design is simply to maintain a specific elevation of the water surface (4'). The tricky part is that the required surface elevation is the same as the natural ground elevation at the outfall structure that is 1,200 feet away. So we're not using gravity for flow or anything. Simply just to control surface elevation.

My concerns are, will this work?
Just because our outfall elevation is the same as the required water surface elevation of our pond, does that mean it will hold as a rain comes through?
Does pressure head not play a part in all of this? Is it as simple as saying that whatever elevation the water surface is in the pond, it will also be that same elevation in the culvert??
Also, How would you go about properly sizing a culvert in this application. Right now I'm just assuming 12" CPP. All of my experience is with gravity flow, so this is throwing me off a tad bit.

Has anyone designed a system like this? Thanks for the help!

RE: Please help with this Pond Elevation Control Structure

Yes, your design will maintain the desired 4' WSE in the pond, although you are going to get a bump in the pond every time it rains, with the recovery time largely dependent on the pipe size.

However, I would be concerned about sediment accumulation and blockage (unless you have periodic high flows sufficient to flush the system). Why not run the outlet pipe along your 4' elevation, preferably at a slight pitch?

Peter Smart
HydroCAD Software
www.hydrocad.net

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