Pond Boss Forums POND CONSTRUCTION Building a dam Automatic Siphon System;

Thanks Rex! I’ve been thinking about making the vent supply pipe larger (6”+) so it would serve as the access basin containing the elbow and downward vent pipe (below frost line) with a grate on the surface of the dam. I also thought I would put the TEE on the vent pipe at one foot above the siphon pipe (for the vent crosspipe) and extend the vertical part on the TEE to the top of the dam (surface). This part would be capped at the surface of the dam. I was wondering if I needed a check valve above the TEE on the vertical pipe between the TEE and the surface cap in order for the automatic and manual siphon to start. In other words, if the top of my main siphon pipe is 24” or more below ground will the amount of air in the vertical portion of vent pipe need a check valve to overcome the amount of air above the TEE to the top of the dam surface for automatic or manual Siphon to start? What do you think?
Heppy