water level


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water level

the water line of a boat or ship

Water Level

 

in rivers and lakes, the position of the free water surface referred to some horizontal surface of constant elevation. The surface of reference may be either relative or absolute, that is, either some plane of arbitrary elevation (the plane is the datum level) or the surface corresponding to the mean water level of the ocean at the shores of the continents.

Variations of the water level in a river occur primarily because of changes in flow rate, warping of the channel, or the backwater effect. In an inland body of water, variations of the water level may result from a change in the ratio of the elements in the water balance, surges, or seiches. Annual water level variations depend on climatic conditions and range from a few centimeters to 2–3 m in lakes and up to 5–12 m in large rivers.

Water level observations are made at water level measuring stations.

water level

[′wȯd·ər ‚lev·əl]
(building construction)

water level

A simple device for establishing two points at the same elevation; consists of a water-filled flexible hose (from which air has been excluded) with a piece of glass tubing at each end; the water level is observed through the glass tubing.
References in periodicals archive ?
The facial area and shielding status around the heat exchanger, which greatly affected to the water level in the engine compartment, were modeled down to details (Figure 7).
The correlation between the instantaneous values of these two components of the total water level is fairly weak at all sites presented in Fig.
2001: Long-term trends in the seasonal cycle of Great Lakes water levels.
Clemans said the juvenile salmon tend to stay in the top 30 to 40 feet of water depth, and as a result the lower water level will encourage them to find the outlet and move downstream.
Up to now all lecture and Investigation on Karkheh dam has been focused on pore water pressure due consolidation, actually pore water pressure due water level fluctuation never has be studied.
Decreasing water levels at North Mosul's dam in northern Iraq have stopped electric power generation, according to an official of the main power station there on Saturday.
ANGLERS are being told to stay away from a Merthyr Tydfil reservoir because of dangerously low water levels.
PESHAWAR, July 14 -- Water level continues to rise in the two major dams of the country, sources said on Tuesday.
Directorate of Water Resources in Salah-al-Deen province said that water level of Tigris River has increased as a result of recent rain fall.
It is clearly indicates that the 10-mm and 20-mm water level give more yielding from 9:00 o'clock to 13:00 o'clock, and then the productivity decreases in the evening.