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Definitions (1721)

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Ablation


Depletion of snow and ice by melting and evaporation.
Source: srh.noaa.gov

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Abutment


The part of a valley or canyon wall against which a dam is constructed. Right and left abutments are those on respective sides of an observer looking downstream.
Source: srh.noaa.gov

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ACCAS


An acronym for Altocumulus Castellanus.
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Accessory cloud


A cloud which is dependent on a larger cloud system for development and continuance. Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds.
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accuracy


Degree of conformity of a measure to a standard or true value.
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Acid Rain


Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.
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Acre-foot


The amount of water required to cover one acre to a depth of one foot. An acre-foot equals 326,851 gallons, or 43,560 cubic feet.
Source: srh.noaa.gov

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Active Conservation Storage


The portion of water stored in a reservoir that can be released for all useful purposes such as municipal water supply, power, irrigation, recreation, fish, wildlife, etc. Conservation storage is the volume of water stored between the inactive pool elevation and flood control stage.
Source: srh.noaa.gov

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Active Storage Capacity


The total amount of reservoir capacity normally available for release from a reservoir below the maximum storage level. It is total or reservoir capacity minus inactive storage capacity. More specifically, it is the volume of water between the outlet works and the spillway crest.
Source: srh.noaa.gov

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Adiabatic process


The change of temperature of air without transferring heat. In an adiabatic process compression results in warming, and expansion results in cooling.
Source: srh.noaa.gov


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