OK I have read though all of the siphon threads and still have a couple of questions.
Did anyone ever get an answer to does the trap freeze and ways to avoid this? Prevent damage?
I am still confused a bit on starting the siphon manually to lower the pond level or drain it. From what I could gather the first step is to block the vent pipe with either a cap over the end or value. Then the outlet side needs to be closed off. Has anyone considered using a threaded coupling at the end and a threaded plug to do this? Any issues with this? After closing off the outlet pipe fill it with water via the vent tee. Since the pond is at or below normal pool the pipe will not completely fill with water, how to get the rest of the air out of the pipe or is there enough pull with the water in the downslope side? The downslope side will be 6' to 15' lower than the pond side.
