One water table that was specifically known was that which was found on Velara III. It was a very thin ribbon between the sandy surface soil and harder rock layers below. (TNG: "Home Soil" ) In 2366, Delta Rana IV's water table was tainted, necessitating the removal of Kevin Uxbridge and Rishon Uxbridge from the planet. (TNG: "The Survivors" ) Later that year, Beta Agni II's water table was sabotaged with tricyanate by Kivas Fajo as part of a plot to kidnap Lieutenant Commander Data. (TNG: "The Most Toys" )