Pond Boss Forums POND CONSTRUCTION Building a dam Improperly installed siphon spillway

The way it's set up right now once the siphon starts, it will drain the whole pond.

If you "T" in an air break, that will allow you to keep the sipon like it stands. Plumb that in so the opening of the air gap is at the level that you want the pond to be when the siphon stops.
http://www.ponddampiping.com/syphon1.html

I'd dig out the funky fittings at the backside of the pond and use 2 45� sweeps to get the outlet away from the bottom of the dam.

It's good to take the bad water off the bottom of the pond.