- 産業: Government
- Number of terms: 15655
- Number of blossaries: 0
- Company Profile:
A U.S. Department of the Interior agency that oversees water resource management incuding the oversight and operation of numerous diversion, delivery, and storage projects the agency has built throughout the western United States for irrigation, water supply, and attendant hydroelectric power ...
A combination of structures and equipment required for the safe operation and control of water released from a reservoir to serve various purposes, i.e., regulate stream flow and quality; release floodwater; and provide irrigation, municipal, and/or industrial water. Included in the outlet works are the intake structure, conduit, control house-gates, regulating gate or valve, gate chamber, and stilling basin. A series of components located in a dam through which normal releases from the reservoir are made. A device to provide controlled releases from a reservoir. A pipe that lets water out of a reservoir, mainly to supply downstream demands.
Industry:Engineering
A use which lessens the amount of water available for another use. Water uses normally associated with man's activities, primarily municipal, industrial, and irrigation uses that deplete water supplies. Water removed from available supplies without direct return to a water resource system, for uses such as manufacturing, agriculture, and food preparation. A nonconsumptive use would be one such as boating or swimming. See beneficial use. Combined amounts of water needed for transpiration by vegetation and for evaporation from adjacent soil, snow, or intercepted precipitation. Also called: crop requirement, crop irrigation requirement, consumptive use requirement. See evapotranspiration.
Industry:Engineering
Usually a two-dimensional representation of all or part of the Earth's surface showing selected natural or manmade features or data, preferably constructed on a definite projection with a specified scale.
Industry:Engineering
Open-jointed tile or perforated pipe located at the toe of the dam used in conjunction with horizontal drainage blankets to collect seepage from the embankment and foundation and conveys the seepage to a location downstream from the dam. A system of pipe and/or pervious material along the downstream toe of a dam used to collect seepage from the foundation and embankment and convey it to a free outlet. Tile or pipe used to collect external seepage along the downstream toe of an embankment.
Industry:Engineering
The public, private, and cooperative electric utility systems of the United States taken as a whole. This includes all electric systems serving the public; regulated investor-owned electric utility companies; Federal power projects and state, municipal, and other government-owned systems, including electric public utility districts; electric cooperatives, including generation and transmission entities; jointly owned electric utility facilities; and electric utility facilities owned by a lessor and leased to an electric utility firm.
Industry:Engineering
The formation of partial vacuums in fast-flowing water caused by subatmospheric pressures immediately downstream from an obstruction or offset. Usually accompanied by noise and vibration. The formation of voids or cavities caused in a liquid due to turbulence or temperature which causes the pressure in local zones of the liquid to fall below the vapor pressure. This happens on the backside of ship propellers, water turbines, blades in pumps, in high-velocity flow lines, and similar locations, depending on the design of equipment and degree of turbulence. The formation and collapse of a gas pocket or bubble on the blade of an impeller or the gate of a valve. The collapse of this gas pocket or bubble drives water into the impeller or gate with a terrific force that can cause pitting on the impeller or gate surface. Cavitation is accompanied by loud noises that sound like someone is pounding on the impeller or gate with a hammer. The attack on surfaces caused by subatmospheric pressures immediately downstream from an obstruction or offset. Usually accompanied by noise and vibration.
Industry:Engineering
Long-throated flumes control discharge rate in a throat that is long enough to cause nearly parallel flow lines in the region of flow control. Parallel flow allows these flumes to be accurately rated by analysis using fluid flow concepts. Long-throated flumes can have nearly any desired cross-sectional shape and can be custom fitted into most canal-site geometries. The Ramp flume, also considered a version of broad-crested weir, is an example of this kind of flume.
Industry:Engineering
A corporation, person, agency, authority, or other legal entity or instrumentality that owns electric generating capacity and is not an electric utility. Nonutility power producers include qualifying cogenerators, qualifying small power producers, and other nonutility generators (including independent power producers) without a designated franchised service area, and which do not file forms listed in the Code of Federal Regulations, Title 18, Part 141.
Industry:Engineering
A unit of apparent power in an ac circuit containing reactance. It is equal to the potential in volts multiplied by the current in amperes, without taking phase into consideration.
Industry:Engineering
An aquatic fern prohibited in the United States by Federal law. An invasive, rapidly growing plant that covers the surfaces of lakes and streams forming floating mats that shade and crowd out important native plants. Thick mats reduce oxygen content, degrading water quality for fish and other organisms, impeding boating, fishing and swimming, and clogging water intakes for irrigation and electrical generation. The plant spreads aggressively by fragmenting and has oblong floating leaves, 1/2 to 1 1/2 inches long. Young plants have smaller leaves that lie flat on the water surface. As the plant matures and aggregates into mats, leaves fold and compress into upright chains. For more information visit the Giant Salvinia website.
Industry:Engineering
