- Lines converging at a single center.
- Browse Related Terms: Allopatric, BRM, Nanometer (millimicron), Project, Radial
- A pivoted crest gate, the face of which is usually a circular arc, with the center of curvature at the pivot about which the gate swings. A gate with a curved upstream plate and radial arms hinged to piers or other supporting structure. See tainter gate, or monocoque gate.
- Browse Related Terms: Fulcrum, Monocoque gate, Radial gate, Radial Gate (Tainter Gate), Wicket gate
A gate with a curved upstream plate and radial arms hinged to piers or other supporting structures on which the gate pivots.
- Browse Related Terms: Fulcrum, Monocoque gate, Radial gate, Radial Gate (Tainter Gate), Wicket gate
A snow water equivalent gage based on the absorption of gamma radiation by snow; this gage can measure up to 55 inches water equivalent with a 2 to 5 percent error.
- Browse Related Terms: Accuracy, Evaporimeter, Federal Snow Sampler, Float Recording Precipitation gage, Gauge pressure, Manometer, Philadelphia rod, Pounds per square inch (psi or lb/in2), Radioisotope Snow Gage, Snow Pillow, Snow Stake, Snow Stick, Tensiometer, Turn angles
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- Horizontal distance from the center of rotation.
- Browse Related Terms: Axis of dam, Cipolletti weir (trapezoidal weir), Concrete lift, Constant angle arch dam, control points, Double curvature arch dam, Engineer's Level, Level, Lift line, Permanent Monument, Plumb, Radius, Rating Curve, Rectangular weir, Skewed, Strike, Theodolite, Thickness or width of dam, Transit, Trunnion, Whaler
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- Liquid resulting from extractions with a solvent.
- Browse Related Terms: Biosphere, Black water, Cavitation damage, Condensation, DEW, Dew point, freshwater, Plasticity index, Pressure Gage, Raffinate ponds, Saline water, Total dissolved solids (TDS), Turbidimeter
- A flume calibrated to measure the flow of liquid in an open channel.
- Browse Related Terms: Demand scheduling, discharge, Fixed amount-frequency scheduling, Flash Flood, Flow, Long-throated flumes, Parshall Flume (Improved Venturi Flume), Ramp flume, V-notch weir, Viscosity
- The rate of change in instantaneous output from a powerplant. The ramp rate is established to prevent undesirable effects due to rapid changes in loading or discharge.
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- In addition to earthquakes that occur on mapped faults, hazards are also presented by earthquakes not associated with known geological structures. The occurrence of these events is best viewed as a random process, hence the term "random" earthquake. Based on earthquake recurrence relationships for an area, estimates of source-to-site distances can be calculated for various magnitudes and probabilities of occurrence.
- Browse Related Terms: Annualized loss of life, APE, Decomposition, Effective peak ground acceleration, Esthetics, Failure potential assessment, Hazardous materials, Intangible Flood Damage, Job hazard analysis (JHA), Random earthquake, Risk, Uncertainty, Velocity Zones
- Geographic region in which a given plant or animal normally lives or grows.
- Browse Related Terms: Amphibian, AUM, behavior, Binomial, Biota, biotope, Candidate Species, Coral Reefs, Desertification, Ecosystem, Epifauna, Fauna, forage, Habitat, Herbivore, Invertebrates, Life cycle, Nutrients, Omnivore, Organic, organism, Point source, Quadrat, Range, Recruitment, Spawning beds, Species, substrate, Toxin, Trophic level, zooplankton
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- A section of a river where the current is very fast moving, caused by a steep descent in the riverbed through a constriction of the main channel.
- Browse Related Terms: Arroyo, Bank, Channel margin deposits, Check dam, Delta, Draw, Military crest, Moveable Bed Streams, Oxbow channel, Rapid, Reattachment deposit, Recirculation zone, Separation deposit
- Also refered to as supercritical flow, rapid flow is distinguished from tranquil flow by a dimensionless number called the Froude number. If the Froude number is less than one, the flow is tranquil. If the Froude number is greater than one, the flow is rapid. If the Froude number is equal to one, the flow is critical. Surface waves can propagate only in the downstream direction. Control of rapid flow depth is always at the upstream end of the rapid flow region.
- 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)
- Birds of prey.
- Browse Related Terms: Avian, Central flyway, Neotropic migrant (neotropical), Pacific flyway, Raptors
- That capacity which a hydrogenerator can deliver without exceeding mechanical safety factors or a nominal temperature rise. In general this is also the nameplate rating except where turbine power under maximum head is insufficient to deliver the nameplate rating of the generator.
- Browse Related Terms: Auxiliary equipment, Average energy, Capacity, Combined cycle plant, Generator nameplate capacity, Installed capacity, Nameplate, Powerplant, Powerplant capacity, Rated capacity, Rated head
- Water depth for which a hydroelectric generator and turbines were designed.
- Browse Related Terms: Auxiliary equipment, Average energy, Capacity, Combined cycle plant, Generator nameplate capacity, Installed capacity, Nameplate, Powerplant, Powerplant capacity, Rated capacity, Rated head
A graph showing the relationship between the stage, usually plotted vertically (Y-axis) and the discharge, usually plotted horizontally (X-axis).
- Browse Related Terms: Axis of dam, Cipolletti weir (trapezoidal weir), Concrete lift, Constant angle arch dam, control points, Double curvature arch dam, Engineer's Level, Level, Lift line, Permanent Monument, Plumb, Radius, Rating Curve, Rectangular weir, Skewed, Strike, Theodolite, Thickness or width of dam, Transit, Trunnion, Whaler
A table of stage values and the corresponding discharge for a river gaging site.
- Browse Related Terms: Bedload, Breakup, Channel Routing, Critical Rainfall Probability (CRP), Effluent Stream, Flood, Flood Plain, Flood Routing, Levee, Rating Table, routing, Sinuosity, Staff Gage
- The relationship between the maximum size of the stone which will enter a crusher, and the size of its product.
- Browse Related Terms: Asymmetric, Deformation, Diagnostic tool, Physiography, Qualitative, Quantitative, Ratio of reduction, screen
The distance between two specific points outlining that portion of the stream, or river for which the forecast applies. This generally applies to the distance above and below the forecast point for which the forecast is valid.
- Any specified length of stream, channel, or other water conveyance. A portion of a stream or a river. The area of a canal or lateral between check structures. Sometimes also used to describe a contiguous stretch of river.
- Browse Related Terms: Backwater Flooding, Contracted weir, Cross-sectional area, Diversion, Drainage Density, Energy dissipator, Ephemeral creek, Flume, Gradient, Incised stream, Instream flow requirements, Length, Mean Depth, Meander, Natural Control, Net Rainfall, Outflow Channel, Outlet channel (exit channel), Reach, Rill, River System, Scour, stream, Stream capacity, Streamflow, Thalweg, Wetted perimeter, Zero Datum
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- The portion of power that is produced by load inductances or capacitances. It is the time average of the instantaneous product of the voltage and current, with current phase shifted 90 degrees. It is expressed as volt-amperes reactive or VARS.
- Browse Related Terms: Active fault, Allowable pile bearing load, Annual failure probability, Baseload, Capability, Dependable Capacity, Intermittent capacity, Load Factor, Load following, Maximum demand, Normal loading conditions, Peak load, Peak load plant, Peaking capacity, Plant factor, Pressure, Reactive Power, Ready reserve, Running and quick-start capability, Seismic parameters, Unload-reload cycle
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