Do you mean water pressure (PSI)? If you had significant pressure , the water would squirt straight out of the hole. What is generating the pressure?
Rick
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WATER??!!!!
Well......that makes my 'Rocket Powered Umbrella' idea sound pretty stupid!
-whatever
-Lou
Water is used in drilling and not all of it drains out. There are long sections that are full of it. When you start talking hundreds of meters, that's a lot of water to push around.