Pond Boss Forums POND CONSTRUCTION Building a dam Siphon Vent Question

Redonthehead, the siphon would be the same as in the link you provided. The only difference would be that the entire system would be completely buried below the frost line in your location. The downward end of the vent that will reach the water in a siphon control in the picture would extend inside a larger piece of pipe that is higher than the apex of the main siphon pipe. An adapter (example 2� pipe to 4� pipe adapter) is also higher than the apex of the siphon pipe would allow you to have the smaller pipe inside a larger pipe with holes drilled in the smaller pipe up to the point it reaches the apex level of the siphon pipe. The solid larger pipe would extend underneath the face of the dam before coming out into the water side face of the dam (trash rack on the end of the larger pipe???) that would then be covered with rock to allow water not debris to rise and fall in the larger pipe as the water level rises and falls. The holes in the smaller pipe inside the larger pipe would control when the water siphons and stops. I was thinking this might be a solution for those in northern climates and was looking for feedback from others with experience that could advise me one way or another. This is just an idea that I thought of recently. Thoughts? Everyone please feel free to critique my idea so that we might find a viable solution for others who live in northern climates.
Heppy