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srh.noaa.gov
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Definitions (1721)
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ablation
Depletion of snow and ice by melting and evaporation.
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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.
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abutment seepage
Reservoir water that moves through seams or pores in the natural abutment material and exits as seepage.
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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.
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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.
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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.
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