1/5 acre pond. Just moved in last summer, so don't know much of pond's history. 6" pvc vertical pipe meets an elbow and then goes horizontal through the dam.
In periods of heavy rainfall water level can get a foot above the top of the stand pipe at which time it flows through a secondary emergency horizontal pipe that goes through the dam.
If the stand pipe is full I would assume that the outflow pipe on the back side of the dam would be full. In fact, the outflow pipe is only pouring out at about 1/4 the diameter of the pipe.
I am further assuming that the pipe is partially blocked. I snaked the stand pipe and could not sense any blockage. The horizontal section is approx 75 feet and I don't have anything long enough to send up there. Does my assumption that the outflow pipe should be full if the vertical pipe is full make sense?
Any suggestions would be appreciated.