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The continuous removal of water from a re-circulating water system.



Related Terms

STATIONARY WAVE

A wave that oscillates without progressing. One-half of such a wave may be illustrated by the oscillation of the water in a pan that has been tilted. Near the axis, which is called the node or nodal line, there is no vertical rise and fall of the water. The ends of the wave are called loops and at these places the vertical rise and fall is at a maximum. The current is maximum near the node and minimum at the loops. The period of a stationary wave depends upon the length and depth of the body of water. A stationary wave may be resolved into two progressive waves of equal amplitude and equal speeds moving in opposite directions. Also called STANDING WAVE.

GRAIN

A unit of measure commonly used in water analysis for the measurement of impurities in water. (17.1 grains = 1 part per million

SALR

Saturated Adiabatic Lapse Rate; the rate at which the temperature of water vapour saturated air changes as it ascends or descends. It is taken as 1.5 degree Celsius per 1000ft.

GUT

A narrow passage or contracted strait connecting two bodies of water

SELF-BAILING

A system of draining water that enters a compartment through scuppers or venturi's.

INLAND SEA

A body of water nearly or completely surrounded by land, especially if very large or composed of salt water. If completely surrounded by land, it is usually called a LAKE. This should not be confused with CLOSED SEA, that part of the ocean enclosed by headlands, within narrow straits, etc., or within the territorial juris- diction of a country.

DRAFT TUBE

The piping system for a reaction-type hydraulic turbine that allows the turbine to be set safely above tail water and yet utilize the full head of the site from head race to tail race.

OUTGASSING

The release of adsorbed or occluded gases or water vapor, usually by heating, as from a vacuum tube or other vacuum system.

DIAGONALS

Fairing lines added to a vessel's body plan. They take the form of straight lines (usually three in smaller craft) drawn diagonally from the centreline, to strike the area of the waterline. The projection a line drawn from the series of intersection points found (of diagonal & waterline) along the hull, gives an indication of the likely water flow across the structure.

HYDROPNEUMATIC

Operated by both water and air power.

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