Low Water Datum (LWD)

Science / Tides and Currents / Low Water Datum (LWD): (1) The geopotential elevation (geopotential difference) for each of the Great Lakes and Lake St. Clair and the corresponding sloping surfaces of the St. Marys, St. Clair, Detroit, Niagara, and St. Lawrence Rivers to which are referred the depths shown on the navigational charts and the authorized depths for navigation improvement projects. Elevations of these planes are referred to IGLD 1985 and are Lake Superior—183.2 meters, Lakes Michigan and Huron—176.0 meters, Lake St. Clair—174.4 meters, Lake Erie—173.5 meters, and Lake Ontario—74.2 meters. (2) An approximation of mean low water that has been adopted as a standard reference for a limited area and is retained for an indefinite period regardless of the fact that it may differ slightly from a better determination of mean low water from a subsequent series of observations. Used primarily for river and harbor engineering purposes. Boston low water datum is an example.

Other Words for Low

Low Adjective Synonyms: short, squat, little, small, stubby, stumpy, stunted, low-lying
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Other Words for Water

Water Noun Synonyms: H2O, distilled water, tap water, drinking-water, bottled water, spa water, still water, soda (water), effervescent water, mineral water, sea water, salt water, ditch-water, dishwater, bath-water, branch water, Adam's ale, Latin a
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Plough, Plow

Business / Construction / Plough, Plow: To cut a lengthwise groove in a board or plank. An exterior handrail normally has a ploughed groove for hand gripping purposes MORE

Personal Allowance

Business / Debt / Personal Allowance: Tax allowances are concessions by the Inland Revenue which can be used to reduce a person's Taxable Income. The main allowance for taxpayers is the 'personal allowance'; which is an amount of income t MORE

Perched Water Table

Science / Geology / Perched Water Table: A water table that is isolated from and higher than the regional water table. This can occur when a hilltop is underlain by an impermeable rock unit. Infiltrating waters stack up on the impermeable un MORE

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