Definitions beginning with G

Numerical values representing vibratory ground motion, such as particle acceleration, velocity, and displacement, frequency content, predominant period, spectral intensity, and duration.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Ground motion, Peak ground acceleration (PGA), Scale, Scaling

An electrically conductive surface that serves as the near-field reflection point for an antenna. Note: A ground plane may consist of a natural (e.g., Earth or sea) surface, an artificial surface of opportunity (e.g., the roof of a motor vehicle), or a specially designed artificial surface (e.g., the disc of a discone antenna).
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Browse Related Terms: altazimuth mount, cosmic noise, Footprint, image antenna

The zero reference level used to apply and measure voltages in a system. Note: A potential difference may exist between this reference level and the ground potential of the Earth, which varies with locality, soil conditions, and meteorological phenomena.
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Browse Related Terms: Earth, earth ground, equipotential ground plane, ground absorption, ground current, ground loop, ground start, ground window, integrated ground plane, isolated ground plane, neutral ground, signal reference subsystem, zone of influence

In hydrologic terms, a satellite dish and associated computer which receives signals from the GOES satellite, decodes the information, and transmits it to a another site for further processing. The GOES satellite ground-receive site is located at Wallops Island, VA; and the information is relayed to a mainframe computer at NWSH for processing.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Confined Ground Water, Deep Seepage, Divide, Effluent Seepage, Excess Rain, Free Ground Water, Ground Water Divide, Ground Water Hydrology, Ground Water Overdraft, Impervious

The rent paid on leased land. Same as "land rent."
U.S. Census Bureau - Cite This Source - This Definition
Payment for the use of land when title to a property is held as a leasehold estate (that is, the borrower does not actually own the property, but has a long-term lease on it).
Federal Trade Commission - Cite This Source - This Definition
Browse Related Terms: Land rent, zoning

A circuit using a common return path that is at ground potential. Note: Earth may serve as a portion of the ground-return circuit. 2. A circuit in which there is a common return path, whether or not connected to earth.
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Browse Related Terms: common-mode interference, common-mode voltage, common return, common return offset, Neutral

A type of analog voicegrade access line signaling that requires the customer interface (CI) to provide a ground on the ring conductor at the network interface (NI) to initiate service requests. [T1.401-1998]
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Browse Related Terms: Assigned Numbers:, facility code, Reserved Numbers, service code

Water that flows or seeps downward and saturates soil or rock, supplying springs and wells. The upper level of the saturated zone is called the water table. Water stored underground in rock crevices and in the pores of geologic materials that make up the earth's crust. That part of the subsurface water which is in the zone of saturation; phreatic water. Water found underground in porous rock strata and soils, as in a spring. Water under ground, such as in wells, springs and aquifers. Generally, all subsurface water as distinct from surface water; specifically, that part of the subsurface water in the saturated zone where the water is under pressure greater than atmospheric.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Perched water table, Saturated zone, Unsaturated zone, Water table, Zone of aeration, Zone of saturation

In hydrologic terms, water within the earth that supplies wells and springs; water in the zone of saturation where all openings in rocks and soil are filled, the upper surface of which forms the water table. Also termed Phreatic water.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Aeration Zone, Capillarity, Capillary Fringe, Capillary Zone, Effluent Stream, Perched Groundwater, Phreatic water, Zone of saturation

In hydrologic terms, A line on a water table where on either side of which the water table slopes downward. It is analogous to a drainage divide between two drainage basins on a land surface
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Confined Ground Water, Deep Seepage, Divide, Effluent Seepage, Excess Rain, Free Ground Water, Ground receive sites, Ground Water Hydrology, Ground Water Overdraft, Impervious

In hydrologic terms, streamflow which results from precipitation that infiltrates into the soil and eventually moves through the soil to the stream channel. This is also referred to as baseflow, or dry-weather flow
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Baseflow, Critical depth, Critical flow, Dry Weather Flow, Sheet Flow, Streamflow