- Pipe thread.
- Browse Related Terms: Annular space, Bailer, Bend, Branch, Butt joint (open joint), Casing, Deflect, Elongate, Fall, Field tile, Flange, Full hydraulic capacity, Gated pipe, Hanger, Haunches (haunch), import, Main, Manifold (Header), nipple, Nominal diameter, P.T, Perforated pipe, Run, Siphon, Siphonage, tile, Vertical curve
- An established air route of migratory birds along the west coast of the United States.
- Browse Related Terms: Avian, Central flyway, Neotropic migrant (neotropical), Pacific flyway, Raptors
- Refers to the studies of the geolgic past.
- Browse Related Terms: biology, Hydrologists, hydrology, Limnology, Natural Science, Paleo-, Social Science
- Paleoflood peak discharges are estimated using geology, fluvial, geomorphology, and stratigraphic records. Geologic information is used to determine flood depths, carbon 14 dating techniques are typically used to determine the time frame when these depths were reached, and hydraulic models, such as step backwater techniques, are used to determine the associated flow given the depth. These floods are used to extend gage records. Floods that have happened approximately 200- to 10,000-years ago can be estimated.
- Browse Related Terms: Backwater Curve, Critical slope, Equilibrium Surface Discharge, Equilibrium Time, Grout Blanket, Normal depth, Paleoflood, Sheet Flow, Steady flow, surge, Time of concentration
- Paleoflood data include two broad categories: fluvial geomorphic evidence and botanical evidence. Paleoflood data are distinguished from both historical and systematic (conventional) flood data by lack of human observation, regardless of the time of occurrence.
- Browse Related Terms: ADMS, Advanced Decision Support System (ADSS), Alert (Automated Local Evaluation in Real Time), ASAPTRAN, DATACOL, DATANET, Geographic Information System (GIS), Hydrometeorological Automated Data System (HADS), Paleoflood data, SHEFPARS
- The study of past or ancient floods which occurred prior to the time of human observation or direct measurement by modern hydrologic procedures. The study of the movements of water and sediment in channels before the time of continuous hydrologic records or direct measurements.
- 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
An index whereby excesses or deficiencies of precipitation are determined in relation to average climate values. The index takes in to account precipitation, potential and actual Evapotranspiration, infiltration of water into the soil, and runoff.
- Browse Related Terms: Base exchange, Capillary attraction (capillary force), Chisel plowing, Colloidal particles, Dispersing agent, Mulch, Open-work materials, Palmer Drought Severity Index, Particle displacement, Particle size, Pore-water pressure, Tilth
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- Marsh habitat.
- Browse Related Terms: Chironomid, Fry, Gametes, Lacustrine habitat, Larval fish, Limnological conditions, Palustrine habitat, Simulid
- Evaporative water losses from a standardized pan. Pan evaporation is sometimes used to estimate crop evapotranspiration and assist in irrigation scheduling.
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Circular flat pieces of ice with a raised rim; the shape and rim are due to repeated collisions.
- Browse Related Terms: Black Ice, Brackish Ice, Breakup date, Cirque, Columnar Ice, Corn Snow Ice, Cryology, Deformed Ice, Dendrites, Diffuse Ice, Drifting Ice, Fracturing, Glacial striations, Glacier Dammed Lake, Grounded ice, Hummocked Ice, Ice Boom, Ice Shove, Pancake Ice, Ridge Ice, Rotten Ice, Sleet
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- Similar to a ring follower gate except the gate leaf is supported along either side by endless trains of rollers. The gate seals by the rollers disengaging from support of the leaf when the gate is completely closed, allowing hydrostatic forces to seal the gate.
- 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
- As defined by the North American Electric Reliability Council, this refers to the flow of electric power on an electric system's transmission facilities resulting from scheduled electric power transfers between two other electric systems. Electric power flows on all interconnected parallel paths in amounts inversely proportional to each path's resistance.
- Browse Related Terms: ASCC, AVADS, back pressure, Baseload plant, Control area, Coordinated operation, Coordination, Distribution system, Grid, Independent System Operator (ISO), Interconnected system, Interruptible demands, Interruptible load, Open access same-time information system (OASIS), Operational waste, Operations and maintenance costs, Parallel path flow, Power pool, Resilience, Standby reserves, Tie lines, Voltage reduction, Western Area Power Administration (WAPA)
Data such as rating curves, unit hydrographs, and rainfall/runoff curves which define hydrologic variables in models.
- Browse Related Terms: Basin Lag, Excess Rain, Flash Flood Guidance (FFG), HDRAIN, Hyetograph, Isohyet, Lag (of a basin), Parametric Data, response time
A solid wall built along the top of a dam for ornament, for the safety of vehicles and pedestrians, or to prevent overtopping.
- A solid wall built along the top of a dam (upstream and/or downstream edge) used for ornamentation, for safety of vehicles and pedestrians, or to prevent overtopping caused by wave runup.
A solid wall built along the top of the dam for ornament, safety, or to prevent overtopping.
- Browse Related Terms: Apron (fore apron), Axis of dam (concrete), Backwater Effect, Berm, Check structure, Deflection, Extrados, Finger drains, Fish ladder (fishway), Forebay, Headwall, Headwater, Heel of dam, Navigation Methods, Parapet wall, Ripple, Shoulder (shell), Toe (toe of dam)
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- A flume with a specially shaped open-channel flow section that may be installed in a drainage lateral or ditch to measure the rate of flow of water. A calibrated device consisting of a broad and flat converging section, a narrow downward sloping throat, and a diverging upward sloping section developed to measure a wide range of flows in an open channel. A calibrated device, based on the principle of critical flow, used to measure the flow of water in open channels. See short-throated flume.
- 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
A list of all flood peaks that exceed a chosen base stage or discharge, regardless of the number of peaks occurring in a year. Generally however, selected to result in one per year on average, with some years having none and others having several.
- Browse Related Terms: ADI, Antecedent flood, Base Flood, Base flood plain, Daily Flood Peak, Designated frequency flood, Flood frequency, Hydrologic Model, Lowland Flooding, Moderate frequency flood, Partial-Duration Flood Series, RFD
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- The time rate of change of particle velocity.
- Browse Related Terms: Compression curve, Consolidation curve, Floc, Natural frequency (f), Newton, Particle acceleration, Particle velocity, Slug, Transport capacity
- The difference between the initial position of a soil particle and any later temporary position during shaking.
- Browse Related Terms: Base exchange, Capillary attraction (capillary force), Chisel plowing, Colloidal particles, Dispersing agent, Mulch, Open-work materials, Palmer Drought Severity Index, Particle displacement, Particle size, Pore-water pressure, Tilth
- Diameter of the various particles comprising a particular soil.
- Browse Related Terms: Base exchange, Capillary attraction (capillary force), Chisel plowing, Colloidal particles, Dispersing agent, Mulch, Open-work materials, Palmer Drought Severity Index, Particle displacement, Particle size, Pore-water pressure, Tilth
- The time rate of change of particle displacement.
- Browse Related Terms: Compression curve, Consolidation curve, Floc, Natural frequency (f), Newton, Particle acceleration, Particle velocity, Slug, Transport capacity