I would let the water rise at least 4" inches to see if that pipe can handle it. Granted the water may go up 4" to where the pipe would be completely full to keep up with your regular inflow. This should handle it without the siphon being used. The regular flow out of the normal part of the drain is not that much less in volume than when the siphon is being used. If I understand siphon drains correctly, they are used when you want to lower water levels beyond their normal. I don't think you need to be using the siphon ability at all with this. I would like to keep about 3 inches of elevation between the normal level and the larger overflow pipe. I like the idea of raising the vent some to ensure maximum flow without cycling. I removed the rubber in a test and the pond level increased about 3/4 of an inch in 24 hours which tells me at least at the present flow rate, cycling between gravity and siphoning will be necessary. I would like to have the 4 inch pipe be able to normally handle the flow without going into the siphon mode. It appears the at the current stream flow, the 4 inch line must operate in the siphon mode part time to keep the level from increasing which is fine, but I would like to know if anyone has experienced this annoyance and if they were able to lessen the noise. The problem I have is that the vent line interface with the water surface makes a pulsating sucking sound that I can hear anywhere around the lake. All seems to work well, controlling the level about 4 inches below the former overflow pipe level, with no beaver problems so far. I installed a u shaped vent on the siphon line extending into the water at the point of level control. If you hear any other sound such as ‘trickling’ or ‘gurgling’, then you need calibration. the water column is way above the Veloster. Once the water level is sufficiently lowered, the siphon should stop with a strong burp. I made "beaver deceiver" patterned after a design documented by Clemson university. Then you should see rapid dumping of water to the reservoir signaling of successful siphoning. Wanting a drain point deeper in the pond plus problems with beavers plugging the 12 inch drain line prompted me to install a 4 inch siphoning line a few inches below the existing large line's elevation. It is a spring fed pond so flow is continuous. How can uninstall Sound Siphon 1.1.0 for Mac, check the content below, you will learn an effective way to remove this application effectively on your PC. It formerly had a standpipe pulling water from the pond surface. I have recently renovated drain for 3 acre pond.
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