Thanks rjackson, for the input. I have to do some digging to give conclusive answers, and I plan to do that soon.
I am beginning to wonder if I really even have an issue. We had about 1" of rain today, so I went to the pond. Understand that we had the siphon vent pipe off and out of the water all weekend, so no siphon should have been present prior to today's rain. The level was clearly up, and about 1" of the siphon vent pipe was underwater. I did have flow(increased) at the downside creek. Clearly not full blast, but about 3/4" deep in the 6" pipe. Only digging up the siphon pipe where it goes through the top of the dam will tell me whether my flow is due to gravity or siphon. My previous understanding was that a siphon system that never loses suction will run wide-open until the level of the pond drops to where the vent tube sucks air? Now, I am hearing a siphon system will only release water at the level it is entering the pond.......not sure how this thing works, but for whatever reasons, my Wife and I were not able to create a siphon so I assumed we had a blockage.
Weather reports for the rain last week confirm we got 4.7" in 3 hours. Maybe that was just too much for the pond to handle.
I dug up the siphon vent tube tonight; hoping to find it to be a threaded coupling so I could remove and send a sewer camera toward the pond. No luck.....it is a glued fitting coming out of a 4x2 flange. Tells me their is also a 6>4" fitting in there too.
The work continues...........
Thank you,
David
