The level of the surface of a body of water.

Dutch: waterhoogte, waterpeil, waterstand
Polish: wodostan

Underground surface below which the ground is wholly saturated with water.

synonyms: groundwater level, water table.

Dutch: grondwater, freatisch water, grondwaterspiegel, grondwaterstand

A line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship.

synonyms: water line, waterline.

Polish: linia wodna, wodnica

A water gauge that shows the level by showing the surface of the water in a trough or U-shaped tube.