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  • In hydrologic terms,

    1) A device for indicating the magnitude or position of a thing in specific units, when such magnitude or position undergoes change, for example: The elevation of a water surface, the velocity of flowing water, the pressure of water, the amount or intensity of precipitation, the depth of snowfall, etc.

    (2) The act or operation of registering or measuring the magnitude or position of a thing when these characteristics are undergoing change.

    (3) The operation, including both field and office work, of measuring the discharge of a stream of water in a waterway.

    NOAA National Weather Service - Cite This Source - This Definition

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  • A horizontal surface used as a zero point for measurement of stage or gage height. This surface usually is located slightly below the lowest point of the stream bottom such that the gage height is usually slightly greater than the maximum depth of water. Because the gage datum is not an actual physical object, the datum is usually defined by specifying the elevations of permanent reference marks such as bridge abutments and survey monuments, and the gage is set to agree with the reference marks. Gage datum is a local datum that is maintained indepen­dently of any national geodetic datum. However, if the elevation of the gage datum relative to the national datum (North American Vertical Datum of 1988 or National Geodetic Vertical Datum of 1929) has been determined, then the gage readings can be converted to elevations above the national datum by adding the elevation of the gage datum to the gage reading.

    NOAA National Weather Service - Cite This Source - This Definition

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All > Science > Weather

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All > Science > Weather

All > Science > Weather

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All > Science > Weather

All > Science > Weather

  • In hydrologic terms, a device in which a leaf or member is moved across the waterway from an external position to control or stop flow. There are many different kinds of gates used on a dam

    NOAA National Weather Service - Cite This Source - This Definition

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All > Science > Weather

Also listed in:

All > Science > Weather

All > Science > Weather

All > Science > Weather

All > Science > Weather

All > Science > Weather

All > Science > Weather

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