I learned this rule first when studying homemade aeration. If drilled pipe does not lie perfectly flat once the air reaches the holes all the air will tend come out the first several holes and flow will not move very much farther down the pipe. The deeper the pipe is the more this rule applies. Test it and prove it to yourself. This also applies to square or rectangular shapes made from drilled pipe.
Last edited by Bill Cody; 02/10/13 08:39 PM.
