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Hmmm! Interesting!
Using 4" plastic pipe for "drill-stem" with manual "wrenching" wouldn't be
able to
overcome the friction: each 10' section would have 120 square feet of
surface area rotating in a dirt bore: that would take serious torque; more
than the plastic could stand.
I'm thinking "hydraulic mining" a 4" hole
would take a 4" hose or pipe and firetruck pumping power and a "million"
gallons of water to do anything effective.
A 2-man gasoline powered posthole digger
with a 4" auger and a lot of 3 foot extensions
would be almost workable but a rock or root
would jam it or a joint would fail at some depth and you'd end up just
giving the whole string a decent burial!
I bleeeeeeve I'd gutter or channel the flow to one side or the other of the
yard where the the disturbance wouldn't be so unsightly and I'd use a
trencher to bury the plastic.
Things get very simple when one doesn't know ALL the facts! (forgive my
musings)
Tony in Texas
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