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Before present year.
- Browse Related Terms: B.P., Habitat generalist (species), Hz
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Noise in the environment (other than noise emanating from the source 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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A broad sloping deposit caused by the joining together of alluvial fans. These occur on the lower slopes of mountains and are often characterized by loose sediment and poor soil development.
- 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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This Act was originally enacted in 1940 as the Bald Eagle Protection Act to protect bald eagles and later amended to include golden eagles. It prohibits the taking or possession of and commerce in bald and golden eagles, parts, feathers, nests, or eggs, with limited exceptions. The definition of take includes pursue, shoot, shoot at, poison, wound, kill, capture, trap, collect, molest, or disturb. Bald eagles may not be taken for any purpose unless a permit is issued prior to the taking. Permits must be obtained from the U.S. Department of the Interior to relocate nests that interfere with resource development or recovery.
- Browse Related Terms: Area of Potential Effect (APE), Bald and Golden Eagle Protection Act, Build out, Census block, Census block groups, Critical Habitat, Endemic, First in time, first in right, Geographic air basin, Landscape, Maintenance area, Military Training Route (MTR), Prior Appropriation Doctrine, Senior water rights
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Volcanic rock (or lava), characteristically dark in color and containing 45 to 54% silica and generally rich in iron and magnesium (mafic composition).
- Browse Related Terms: Andesite, Aquifer-volcanic rock, Basalt, Dome, volcanic, Obsidian, Rhyolite, Rhyolitic domes, Scoria, Tertiary volcanics (Tv), Tuff, Vent, Volcanic vent, Volcanic-rock aquifer
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A site occupied by several families or more on either a year round or a seasonal basis. Identified archaeologically by primary and secondary tools and other artifacts, as well as floral and faunal remains from subsistence activities. Characterized by extensive scatters and quantities of debris such as potsherds, fire-cracked rock, whole and broken flaked stone tools, chipping waste, charred bone, milling tools, house structures, hearths, rock rings, and sometimes rock art or burials.
- Browse Related Terms: Base camp, Eutectic, Feature, Fire-cracked rock, Flake, Fossil, lithic, Paleontological resources, Roost, Stratigraphy (stratigraphic)
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The suite of mostly crystalline igneous and/or metamorphic rocks that generally underlies the sedimentary rock sequence.
- Browse Related Terms: Aquifer, Basement complex, Basement rock, Breccia, Chert, Conglomerate, Hydrostratigraphic, Impermeable, Induration, Laccolith, Metamorphic rock, Quartzite, Schist, Shale (outcrop), Siltstone, Strata, Volcanoclastic rock
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The oldest rocks in a given area; a complex of metamorphic and igneous rocks that underlies the sedimentary deposits. Usually Precambrian or Paleozoic in age.
- Browse Related Terms: Aquifer, Basement complex, Basement rock, Breccia, Chert, Conglomerate, Hydrostratigraphic, Impermeable, Induration, Laccolith, Metamorphic rock, Quartzite, Schist, Shale (outcrop), Siltstone, Strata, Volcanoclastic rock
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: (1) A depression in the Earth's surface that collects sediment. (2) The area of land that drains to a particular river.
- Browse Related Terms: Basin, Catchment basin, dewatering, Dry lake, Great Basin, Playa, Playa lake, Riparian, River Basin, Siltation, Watershed
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- See Aquifer-basin fill
- 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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Two or more electrochemical cells enclosed in a container and electrically interconnected in an appropriate series and/or parallel arrangement to provide the required operating voltage and current levels. Under common usage, the term battery also applies to a single cell if it constitutes the entire electrochemical storage system.
- 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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The maximum total electrical charge, expressed in ampere-hours, which a battery can deliver to a load under a specific set of conditions.
- 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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General term referring to the solid rock or ledge underlying other unconsolidated material, i.e., soil, loose gravel, etc.
- Browse Related Terms: Bedrock, Colluvium, Cover, Desert pavement, Detritus, Dunnage, Fill, Sedimentary rock, Slope failure, strain, Unstable slopes
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A relatively level step, excavated into a slope on which fill is to be placed. Its purpose is to provide a firm stable contact between the existing material and the new fill which is to be placed.
- Browse Related Terms: Alluvial valley, Bench, Intermontane basin, Mesa, Pediment, Plains, Upwarp, Valley floor
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A use of water resulting in appreciable gain or benefit to the user, consistent with state law, which varies from one state to another. Most states recognize the following uses as beneficial: domestic, municipal, and industrial uses; irrigation; mining; hydroelectric power; navigation; recreation; stock raising; public parks; and wildlife and game preserves.
- Browse Related Terms: Appropriation Doctrine, Augmentation Plan, Beneficial use of water, Domestic water use, Entry, Fast-track, Incidental take permit, Irrigation, Reclamation withdrawal, Regular-track proposals, Reserved Water Right, Safe Drinking Water Act (SWDA)
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Living in or occurring at the bottom of a body of water.
- Browse Related Terms: Augmentation water, Benthic, Channel incision, drawdown, Floodplain, Groundwater overdraft, hydrology, Inflow, Junior water rights, Kiva, Outflow, Perennial/safe/sustainable yield, Phosphorous, Point of diversion, Pueblo rights, Thermal water, Water right
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A practice or combination of practices that are determined to provide the most effective, environmentally sound, and economically feasible means of managing an activity and mitigating its impacts.
- Browse Related Terms: Acute, Adverse environmental impacts, Best Management Practice (BMP), Compensatory mitigation, Contrast level, Design features, Direct impacts, Hedonic statistical framework, Impulsive noise, Just-in-time ordering, Key observation point(s) (KOP), Mitigation, Mitigation measures, PFYC, Region of Influence (ROI), Richter Magnitude Scale, View duration, Visual mitigation
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A stone tool that has been flaked on both sides.
- Browse Related Terms: Atlatl, Biface, Drill, Graver, Ground, Lithic debitage, Lithic scatter, Projectile point, Scraper
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Those species of large mammals normally managed as a sport-hunting resource.
- Browse Related Terms: Aquatic opportunists, Big game, Ecotones, Extirpation, Facultative wetland vegetation species, Fire-tolerant species, Flats wetland, Habitat alteration, Invasive species, Lek, Megafauna, Nongame species, Scarify, Species of Special Concern, Translocation
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Biological sources such as plants and animals that emit air pollutants such as volatile organic compounds. Examples of biogenic sources include animal management operations, and oak and pine tree forests.
- Browse Related Terms: Appropriate Management Level (AML), Aquaculture, Aquatic biota, Aquatic ecosystem, Biogenic source (emissions), Biota, Browse, Bryozoan, Burrow, cavity, Collection, Community, Crustaceans, Ecoregion, Fauna, Habitat, Harassment, Invertebrate, Montane, NatureServe Explorer, Plankton (planktonic), Terrestrial, Wetlands, Zoomorphic