- Special name given to a crib dam when built with gabions. See dam.
- Browse Related Terms: BCD, Camber, DD, Dike, Diversion capacity, Downstream face, Earth Dam or Earthfill Dam, Flood Wave, Fluctuating flows, Gabion dam, Hydraulic fill structure, Impoundment, Irrigation check, Overtopping, Pond, Rolled Earth Dam, Saddle dam, Seepage collar, Tailings dam., Toe Drain (or Outfall), Toe of Dam, Toe of Dam (Upstream and Downstream), Top of dam., Upstream face
(1) A device for indicating the magnitude or position of a thing in specific units, when such magnitude or position undergoes change, for example: The elevation of a water surface, the velocity of flowing water, the pressure of water, the amount or intensity of precipitation, the depth of snowfall, etc. (2) The act or operation of registering or measuring the magnitude or position of a thing when these characteristics are undergoing change. (3) The operation, including both field and office work, of measuring the discharge of a stream of water in a waterway.
- Browse Related Terms: Critical Depth, Critical flow, Critical velocity, Froude number, Gage, Non-uniform flow, Price Current Meter, Rapid flow, Spillway chute, Subcritical flow, Supercritical flow, Tranquil flow, Uniform flow, Water hammer (hydraulic transient)
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The arbitrary zero datum elevation which all stage measurements are made from.
- Browse Related Terms: Datum, Elevation, Gage Datum, Gage Height, Gage height (G.H.), Gage Zero, Gauge height, Hypsography, River Gage Datum, Stage, Station, Water surface elevation (stage)
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The water-surface elevation referred to some arbitrary gage datum. Gage height is often used interchangeably with the more general term stage, although gage height is more appropriate when used with a reading on a gage.
- Browse Related Terms: Datum, Elevation, Gage Datum, Gage Height, Gage height (G.H.), Gage Zero, Gauge height, Hypsography, River Gage Datum, Stage, Station, Water surface elevation (stage)
- The water surface elevation referred to some arbitrary gage datum. Gage height is often used interchangeably with the more general term "stage," although gage height is more appropriate when used with a reading on a gage. See gauge height.
- Browse Related Terms: Datum, Elevation, Gage Datum, Gage Height, Gage height (G.H.), Gage Zero, Gauge height, Hypsography, River Gage Datum, Stage, Station, Water surface elevation (stage)
The elevation of zero stage. (Same as gage datum.)
- Browse Related Terms: Datum, Elevation, Gage Datum, Gage Height, Gage height (G.H.), Gage Zero, Gauge height, Hypsography, River Gage Datum, Stage, Station, Water surface elevation (stage)
A particular site on a watercourse where systematic observations of stage and/or flow are measured.
- A particular site on a stream, canal, lake, or reservoir where systematic observations of hydrologic data are obtained.
- Browse Related Terms: Buffer strips (filter strips, vegetated filter strips, grassed buffers), Confluence, Containment levee, Depletion Curve, Diversion dam, Escapement, Flow augmentation, Gaging Station, Ground water recharge, Gullying, Headward Erosion, Hydrographic Survey, Inclined Staff Gage, Intermittent stream, Movable Bed, Normal Year, Perennial Stream, Riparian Zone, Run-of-river plants, Seasonal stream., Sheet wash, Small Stream Flooding, Stream Gage
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- Stream or reach that receives water from the zone of saturation.
- Browse Related Terms: Backwater, Braided Stream, Caisson, Catchment basin, Coulees, Dendritic, Eddy, Gaining stream, Losing stream, Main channel, Mainstream (mainstem), Pool
(a) A passageway within the body of a dam or abutment; hence the terms "grouting gallery", "inspection gallery", and "drainage gallery". (b) A long and rather narrow hall; hence the following terms for a power plant: "valve gallery", "transformer gallery", and "busbar gallery
A passageway within the body of a dam or abutment.
- A passageway within the body of a dam, its foundation, or abutments used for inspection, foundation grouting, and/or drainage.
- Browse Related Terms: Abutment, Adit, Crest Length, Gallery, Groin, Juvenile salmon, Left Abutment, Right Abutment, Seep, Upstream blanket, Volume of Concrete, Volume of dam
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- A unit of measure equal to four quarts or 128 fluid ounces.
- Browse Related Terms: Amperage, British thermal units (Btu), Current Meter, Distribution efficiency, Gallon, Hydrometer, Inch-Degrees, Joule, Mil, Nephelometric, Paleoflood hydrology, Permeameter, Pitot Tube, Planimeter, River Gage, River mile (RM), Secchi depth, Seismic intensity, Totalizer (integrator), Vernier
- To coat a metal (especially iron or steel) with zinc. Galvanization is the process of coating a metal with zinc.
- Browse Related Terms: Cairn, French drain, Galvanize, Hazardous waste sites, Mine tailings dam, Stockpile, Tailings
- Eggs or sperm.
- Browse Related Terms: Chironomid, Fry, Gametes, Lacustrine habitat, Larval fish, Limnological conditions, Palustrine habitat, Simulid
- An overhead structure that supports machines or operating parts, such as a gantry crane.
- Browse Related Terms: Derrick, Design wind, Gantry, Gantry crane, Rewind, Seiche wave, Shear wall, Slide, Stator windings, Uprate
- A fixed or traveling, bent-supported crane for handling heavy equipment.
- Browse Related Terms: Derrick, Design wind, Gantry, Gantry crane, Rewind, Seiche wave, Shear wall, Slide, Stator windings, Uprate
- Condition of higher levels of dissolved gases in water due to entrainment, pressure increases, or heating.
- Browse Related Terms: Bench, Blue tops, drawdown, Gaseous supersaturation, Grade stake, Hinge Crack, Maximum Contaminant Level Goal (MCLG), New York rod, Soil subsidence, Wire Weight Gage
A device in which a leaf or member is moved across the waterway from an external position to control or stop flow. There are many different kinds of gates used on a dam. Some include: Bulkhead, Crest (or Spillway), Emergency, Fixed Wheel, Flap, Flood, Guard, Outlet, Radial, Regulating, and Slide Gates.
- 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. Structure or device for controlling the rate of flow into or from a canal or ditch. A movable, watertight barrier for the control of water in a waterway. See bear-trap gate, bulkhead gate, clam shell gate, coaster gate, crest gate, cylinder gate, drum gate, emergency gate, fixed-wheel gate, flap gate, flood gate, guard gate, high-pressure gate, jet-flow gate, outlet gate, paradox gate, radial gate, regulating gate, ring gate, ring- follower gate, ring seal gate, roller gate, skimmer gate, slide gate, sluice gate, stoney gate, tainter gate, tractor gate, vertical lift gate, or wicket gate.
A device in which a leaf or member is moved across the waterway from an external position to control or stop flow.
- Browse Related Terms: Annular, Bear-trap gate, Coaster gate, Gate, Goggle valve., High-pressure gate, Jet-flow gate, Paradox gate, Ring seal gate, Ring-follower gate, Tractor gate
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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 are located. A room from which a gate or valve can be operated, or sometimes in which the gate is located. Concrete portion of an outlet works containing gates between upstream and downstream conduits and/or tunnels.
- Browse Related Terms: Balanced head condition, Bulkhead Gate, Clam shell gate, Differential head (unbalanced head), Displacement pump, Dry Flood proofing, Emergency gate, Gate chamber (valve chamber), Guard gate (emergency), Outlet Works, Piezometer, Regulating gate (operating gate, regulating valve), Regulating Gate (Regulating Valve), Relief valve
- A device used to maintain a set gate opening.
- Browse Related Terms: Access shaft, Barrage (gate-structure dam), Bascule gate., Best gate, Cylinder gate, Flap gate, Full gate, Gate hanger, Roller drum gate., Shaft house, Tainter gate
- Portion of spillway between inlet channel and chute, tunnel or conduit, which contains gates, such as radial gates.
- Browse Related Terms: Bulkhead, Chute, Conduit, Control structure (control house), Crest structure, Flip bucket, Gate structure, Inlet channel (inlet structure), Spillway channel, Stilling Basin, Stilling pool, Terminal structure, Tunnel, Water conveyance structure, Wet Floodproofing