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Gabion |
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Wire basket, filled with stones, used to stabilize banks of a water course and to enhance habitat. |
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Gabion dam |
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Special name given to a crib dam when built with gabions. See dam. |
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Gaining stream |
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Stream or reach that receives water from the zone of saturation. |
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Gallery |
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A passageway within the body of a dam, its foundation, or abutments. |
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Gametes |
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Eggs or sperm. |
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Gantry |
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An overhead structure that surrports machines or operating parts, such as a gantry crane |
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Gaseous supersaturation |
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Condition of higher levels of dissolved gases in water due to entrainment, pressure increases, or heating. |
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Gate |
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A device that controls the flow in a conduit, pipe, or tunnel without obstructing any portion of the waterway when in the fully open position. See cylinder gate, drum gate, fixed- wheel gate, guard gate, high-pressure gate, jet-flow gate, radial gate, regulating gate, ring gate, ring- follower gate, roller gate, slide gate, or tainter gate. |
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Gate chamber |
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A chamber in which a guard gate in a pressurized outlet works or both the guard and regulating gates in a free-flow outlet works is located. Concrete portion of an outlet works containing gates between upstream and downstream conduits and/or tunnels. |
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Gate hanger |
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A device used to maintain a set gate opening. |
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Gate structure |
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Portion of spillway between inlet channel and chute, tunnel or conduit, which contains gates, such as radial gates. |
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Gate valve |
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A valve with a circular-shaped closing element that fit securely over an opening through which water flows. |
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Gauge |
Gauging station |
Specific location on a stream where systematic observations of hydrologic data are obtained through mechanical or electrical means. Thickness of wire or sheet metal. |
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Generation |
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The energy generated in kWh (kilowatt-hours) represents gross generation. It consists of the total generation minus station use. Process of producing electric energy by transforming other forms of energy. |
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Generator |
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Machine that converts mechanical energy into electrical energy. |
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Geohydrology |
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Geological study of the character, source, and mode of groundwater. |
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Geology |
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The science that deals with the physical history of the earth, the rocks of which it is comprised, and the physical changes which the earth has undergone or is undergoing. |
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Geomorphic |
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Of or relating to the form or shape of the earth. |
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Geomorphology |
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Geological study of the configuration, characteristics, origin, and evolution of land forms and earth features. |
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Geophysics |
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Refers to the physics of the earth, e.g., seismology, oceanography, volcanology, geomagnetism, etc. |
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Gigawatt |
gw |
Unit of power equal to 1 billion watts. |
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Gigawatthour |
GWh |
One billion watthours of electrical energy. |
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Gradation |
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Proportion of material of each grain-size present in a given soil |
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Grade |
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The elevation of a surface or a surface slope. |
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Grade stake |
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A stake indicating the amount of cut or fill required to bring the ground to a specified level. |
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Graded stream |
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Streams that receive and carry away equal amounts of sediment. |
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Grader |
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A machine with a centrally located blade that can be angled to cast to either side, with independent hoist control on each side. |
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Gradient |
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General slope or rate of change in vertical elevation per unit of horizontal distance of water surface of a flowing stream. Slope along a specific route, as of a road surface, channel or pipe. |
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Grapple |
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A clamshell-type bucket having three or more jaws. |
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Gravel |
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Loose rounded fragments of rock that will pass a 3-inch sieve and be retained on a No. 4 sieve (3/16 inch). |
