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OVERCOMING UNDERGDOUND WATER PRESSURES FOR HDROSTATIS TANK TESTING <br /> WITH AN,,.NTERNAL ADVANTAGE OF <br /> CALCULATION SHEET <br /> Z [ (Y-X) . 036 ] . 1:5 -Y <br /> ` { r ' <br /> (1) SUBTRACT (Y-X) <br /> (2) TAKE RESULT OF (1 ) AND MULTIPLY BY . 036 O X,O 31=d <br /> (3) TAKE RESULT OF (2) AND ADD 1 . 5 0-t-�,5r /.5 <br /> (4) TAKE RESULT OF (3) AND DIVIDE BY r �, � Off ►: �/83`� <br /> (5) TAKE RESULT OF (4) AND SUBTRACT Y <br /> (6) THE RESULT OF (5) EQUALS THE NUMBER OF INCHES OF PRODUCT ABOVE GRADE <br /> �vb �-✓/�ir,c� /�PSpwi <br />