Perhaps you could compromise and dig a series of holes (say 10' apart) and
try 'drilling' from one to the next. That might help keep the 'drill'
aligned in both the vertical & horizontal planes.
When we had some septic tank work done at our former residence in
Massachusetts, the contractor did use a 'water drill' to run a 4" pipe under
the driveway. He dug a hole on either side of the driveway and shoved the
pipe under the driveway (~ 10'). I confess I didn't study what he did (plus
it was 12-13 years ago...) but I do recall he used a garden hose and sort of
forced the pipe through letting the water wash the dirt/mud back through the
pipe. So, I would think you might want to start at the bottom of the hill
and work upwards?
Eric Russell
Mebane, NC
http://home.mebtel.net/~ejrussell
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