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Twenty-four-hour average noise level, obtained after the addition of a 10-dB penalty for environmental noise occurring from 10 p.m. to 7 a.m. to account for the increased annoyance at night. This 10-dB penalty means that one nighttime noise event is equivalent to 10 daytime noise events of the same level.
- Browse Related Terms: Atmospheric absorption, attenuation, Background level noise, Broadband noise, Chronic effects, Day-night average noise level, Daytime mean rural background level, Decibel (dB), Decibel, A-weighted (dBA), Geometric spreading, Hertz (Hz), Ldn, Leq, MCL, Nighttime mean rural background level, Noise
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Daytime (7 a.m. to 10 p.m.) average sound level in the rural environment, from all sources other than a particular noise that is of interest.
- Browse Related Terms: Atmospheric absorption, attenuation, Background level noise, Broadband noise, Chronic effects, Day-night average noise level, Daytime mean rural background level, Decibel (dB), Decibel, A-weighted (dBA), Geometric spreading, Hertz (Hz), Ldn, Leq, MCL, Nighttime mean rural background level, Noise
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- See Direct current
- Browse Related Terms: AC, Alternating current (AC), Battery, Build-out capacity, Cadmium (Cd), DC, Direct current (DC), DNI, Electrolytes (battery), Gallium (Ga), Inverter, Irradiance, Photovoltaic (PV) cell, Power conditioning system (PCS)
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A mixture of water-saturated rock debris that flows downslope under the force of gravity (also called lahar or mudflow).
- Browse Related Terms: Aquifer-confined, Debris flow, Deposit, Geology, Glacial till, Groundwater, Rock outcrop, Seepage, Tectonic
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Alluvial fans prone to debris flows; a mixture of water and debris, such as mudslides, mudflows, or debris avalanches. Debris flow fans are created by the deposits of repeated debris flows at the mouth of the canyon.
- Browse Related Terms: Alluvial fan, Alluvian fan terrace, Bajada, Debris flow fans, Desert bench, Fan, Fan apron, Fan piedmont, Fan remnant, Fan terrace, Inset fans, Lahar, Skirt (fan, dune)
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A standard unit for measuring the loudness or intensity of sound. In general, a sound doubles in loudness with every increase of 10 decibels.
- Browse Related Terms: Atmospheric absorption, attenuation, Background level noise, Broadband noise, Chronic effects, Day-night average noise level, Daytime mean rural background level, Decibel (dB), Decibel, A-weighted (dBA), Geometric spreading, Hertz (Hz), Ldn, Leq, MCL, Nighttime mean rural background level, Noise
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A measurement of sound approximating the sensitivity of the human ear and used to characterize the intensity or loudness of a sound.
- Browse Related Terms: Atmospheric absorption, attenuation, Background level noise, Broadband noise, Chronic effects, Day-night average noise level, Daytime mean rural background level, Decibel (dB), Decibel, A-weighted (dBA), Geometric spreading, Hertz (Hz), Ldn, Leq, MCL, Nighttime mean rural background level, Noise
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Plants that shed their leaves annually. Not evergreen.
- Browse Related Terms: Conifer, Deciduous, Emergent, Emergent wetlands, Flora, Forbs, Graminoid herbaceous, Herbaceous, Macrophyte (aquatic), Marsh, Mosses, Noxious weeds, Nurse plants, Palustrine wetlands, Pesticide, Phytoplankton, Sedge, Shrub, Weed
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All activities necessary to take out of service and dispose of a facility after its useful life.
- Browse Related Terms: Decommissioning, Domestic solid waste, Off-site facility, Sanitary waste, Sanitary wastewater, Substation, Waste management, Waste minimization
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A battery with large plates that can withstand many discharges to a low state of charge.
- Browse Related Terms: Battery capacity, Corona discharge, Deep-cycle battery, Electric and magnetic field (EMF), Electron, Grid, Ground fault mats, Low-level magnetic fields, Transmission line
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An alluvial deposit at the mouth of a river, usually triangular in shape. An area formed from the deposition of sediments at the mouth of a river.
- Browse Related Terms: Acid deposition, Alluvial, Alluvial flats, Alluvial plains, Delta, Excessive slopes, Fluvial, Geotextile mats, Interdune flat, Lacustrine wetland, Land disturbance in natural drainage systems, Overbank deposits, Shear strength, Soil deposition, Unconsolidated (basin fill deposits), Vernal pool
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Specific actions taken by utility companies, their regulators, and other entities to induce, influence, or compel consumers to reduce their energy consumption, particularly during periods of peak demand.
- Browse Related Terms: Abiotic, Anthropogenic emissions, Demand-side management, Direct effects, Ecosystem, Effects, Full-time equivalent (FTE), Indirect effects, NatureServe, Noise criteria, Reclamation, Stressors
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Related to the vital statistics of human populations (size, density, growth, distribution, etc.) and the effect of these on social and economic conditions.
- Browse Related Terms: Ambient Air, Boreal, Chaparral, Demographic, Desert scrub, Ethnobotany (ethnobotanical), Grasslands, Habitat type, In-migration, Rangeland, Socioeconomics
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Net loss of water through consumption, export, and other uses to a given area, river system, or basin. The terms consumptive use and depletion, often used interchangeably, are not the same.
- Browse Related Terms: Basin-fill aquifer, Bolson (floor), Closed Basin, compact, Depletion, Earthern cattle tank, Groundwater basin, Gypsum, Infiltration pond, Interbasin flow, Interbasin transfer of water, Interbasin transfers, Overdraft, Perennial yield (groundwater), reservoir, Safe yield, Sustainable yield
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Earth material that has accumulated by some natural process. For example, a flowing mixture of water and rock debris is called a debris flow, but when the flow ceases to move, a layer of fine and coarse rock is left, which is called a debris-flow deposit.
- Browse Related Terms: Aquifer-confined, Debris flow, Deposit, Geology, Glacial till, Groundwater, Rock outcrop, Seepage, Tectonic
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Arid region receiving less than 10 inches of precipitation annually.
- Browse Related Terms: arid, Desert, Mantle hot spot, Mesic habitat, OASIS, Prehistoric resources, Rain shadow effect, Semi-arid, Shadow zone, Shrink-swell potential, Upper-air sounding
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A relatively flat terrace elevated above the surface of a desert alluvial feature, such as an ephemeral stream or wash.
- Browse Related Terms: Alluvial fan, Alluvian fan terrace, Bajada, Debris flow fans, Desert bench, Fan, Fan apron, Fan piedmont, Fan remnant, Fan terrace, Inset fans, Lahar, Skirt (fan, dune)
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A wind-created ridge or mound of sand that is found in deserts or near oceans and lakes.
- Browse Related Terms: Borrow material, Desert dune, Eolian, Lag gravel, Sand dune, Sedimentation, Winnowing
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The land surface in a desert valley.
- Browse Related Terms: Braided streams, Desert floor, Flash Flood, Pithouse, Relict, Stream terrace, Terrace, Upland
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Bird species whose requirements define spatial attributes, habitat characteristics, and management regimes representative of a healthy desert system.
- Browse Related Terms: Carrying Capacity, Compensation, Desert focal bird species, Ecological resources, Endangered Species Act of 1973 (ESA), fragmentation, Fragmentation of habitat, Habitat degradation, Obligate species, Riparian obligate species, Sand dune obligate species, Shrub-steppe, Shrubsteppe obligate, Snag, steppe, Wildlife corridor, Xeric (habitat)