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(naval architecture)
The intersection of the surface of the water with the side of a ship.
A line painted on the hull of a ship showing the level of the water when the ship is properly trimmed.



(also shoreline), the line of contact between the water surface of a body of water—such as a lake, river, or sea—and a dry land surface, or shore. The height and shape of a waterline vary owing to fluctuations in the level and changes in the nature of the shore that result from erosion, abrasion, or human activity.


Inside a cistern, the highest water level to which the ball valve should be adjusted to shut off.

waterline (WL)

waterline (WL)
A system of aircraft location designation. The water line is the measurement of height in inches perpendicular from a horizontal plane located a fixed number of inches below the bottom of the aircraft fuselage.
References in periodicals archive ?
The microbial contamination in dental unit waterlines was first described by Blake in 19632.
VistaTab is a tablet used for the cleaning of microbial contaminants in dental unit waterlines.
Biofilm commonly occurs in dental waterlines because the waterlines harbor an environment in which biofilm thrives.
Because the organisms live within the waterlines, only heat-sterilized/sterile-disposable bulb syringes or sterile water delivery devices should be used to deliver the sterile water.
An entangled system of 6", 8", 12" and 16" waterlines exist in the boulevard - road intersection.
The proposed waterline is to replace the aging ductile iron and cast iron waterlines.
Tenders are invited for Utility rehabilitation of the existing sanitary sewer and waterlines.
Justification : The existing waterlines were installed in 1949.
Project 1: Horizontal directional drillings/borings and waterlines design under Redwood Road and 10400 South intersection.
It is also the City s intention to replace all waterlines in the neighborhood over the next several years, design of which is not included in this scope