A low-water-pressure-controlled hydrologic test using a measurement pipe containing an inner packer which is equipped with a water pressure gage at its tip is disclosed. Some water is poured into the measurement pipe in advance so as to diminish the pressure head difference between the in-pipe pressure...http://www.google.es/patents/US4986120?utm_source=gb-gplus-sharePatente US4986120 - Low-water-pressure controlled hydrologic test method
Low-water-pressure controlled hydrologic test method
