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Building pond--need drain valve
I had the same dilemma a few years ago for my own pond. All the old timer pond guys kept saying STAND PIPE. Well we had one for years growing up and yes it was a bit too small 6 inches. The water flow was not the problem. It was the clogs. Sticks, algae, rocks from vandals, a constant problem.
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Building pond--need drain valve
For my pond, I wanted to over engineer, so I ran a 12 inch straight through at the max level I wanted, sloping down hill, hard to clog a straight shot and will handle flood extra. I also wanted to have adjustability in level and drain potential, so I used 8 inch sewer pipe.
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Building pond--need drain valve
The 8 inch went about 3-4 feet down in the pond bank. Sewer uses a rubber gasket at the joints, so a 90 and a 3 foot stand pipe to the top. Now I can adjust the angle of the 90 to get any level I want and the tight gasket holds it in position very well, I really have to push it to move it. that should drain about 75 percent of the water if needed and a manure pump could be used to empty the rest.
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Building pond--need drain valve
I didn't put it all the way down because of the clog issue and yes it has been clogged already, by muscrats, they even got the 12 inch half clogged. Easily flushed out since it was only 3 feet down. would have been much harder to adjust the angle of a 6 foot stand pipe, and boyancy may have been too much.
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Building pond--need drain valve
check out agridrain, they have some really cool stuff for ponds. I got my rodent guards from them and tile tape. http://www.agridrain.com/ With the adjustable max height, at times when a really heavy rain is predicted, I drop the level 6 inches to give me a buffer from overflow. I have about a 40 acre watershed that drains to the pond and there was no way around it.
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