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 ?
In such sections almost all very high wave set-up events occur when the offshore water level is modest (Fig.
Each fall and early winter, the corps drops water levels at most of its Willamette Valley dams.
Thus, investigation has been done in this way: the velocity of water level fluctuation in reservoir ([DELTA]l/[DELTA]t]) and all piezometers in core calculated.
The water level in River Jhelum at Mangla was 1178.
If the water level decreases from 60mm to 10mm then the productivity of the still is increased by 12%.
Consequently, connections between water level fluctuations and other parameters having more observed data are analyzed and the results are used to reconstruct long-term water level fluctuations.
The water level in the pond needed to be lowered to the point where the sluiceway could be uncovered and then filled with concrete to permanently stop the flow of water through the building.
As managing our water resources becomes increasingly critical, the need for accurate water level measurements is more important than ever," said Paul Gannett, product marketing manager for Onset.
However, he says in the last eight years, the water level has dropped dramatically and really hasn't recovered.
Photo: The water level at the Castaic lake will be lowered.
However, every dam should have an emergency spillway, and some sort of bottom drain to control water release and maintain the water level.
What will happen to the water level as the ice melts?