Thanks Steve!
Your drawing is almost spot-on for my system; at least the exposed parts. I do have a 45 on the end. I first thought this was to minimize creek bed erosion, and later learned it is there to assist with the siphon system.
As far as plugging the hole, I am still in the homemade approach. The plugs and caps I can buy on Amazon or at Lowes fit a piece of 6" pipe, but do not fit a 45 coupling for a 6" pipe. What I really need is about a 3" piece of pipe to solvent weld into the 45, so I have a true 6" pipe to adapt a ball valve to. I just have not found a source for a 3" long piece yet, haha.
I am still not sure if my drain inlet is clogged, and I expect I may not find out until the next big frog-choker. I will be watching. I was wondering how deep beavers will plug a hole. I have no active signs, but there is plenty of muck and brush in my pond.
Thank you for your help!
David in Greenwood, SC
