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How deep irrigation lines
I agree with Bird. The soil arch will support it against the tractor's weight even though it is only a few inches down. You will probably want it deeper than that for other reasons. I also like the poly pipe. Locally the 3/4" diam. and larger come in two or three different weights. For a real bulletproof system you can thread the poly pipe through some of the black plastic corrugated pipe (get the kind without the drain slits) - it is darn near as cheap as the poly pipe. And bury your "pipe within a pipe". This is particularly good where there are lots of rocks. A plastic soda bottle taped to the end of the poly helps in threading, as does straightening the poly out in the hot sun.
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How deep irrigation lines
Hard to believe that the poly pipe wasn't there. Are we talking about the same thing? What I am calling poly pipe is black and comes in a roll of 100 or 250 feet. It is fairly stiff and difficult to straighten out. It is also much more durable than PVC. Joints are made with barbed couplers + hose clamps, and the pipe normally requires heating to make the coupler join well. I have two lines of a couple of hundred feet. One PVC and one Poly. They work the same. The pressure idea is interesting, though I don't think you could measure the difference.
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DennisCTB
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04-04-2001, 22:48 
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