- 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 ...
Directional, orderly process of community change in which the community modifies the physical environment to eventually establish an ecosystem which is as stable as possible at the site in question.
Industry:Engineering
The state regulatory agency that governs retail utility rates and practices and, in many cases, issues approvals for the construction of new generation and transmission facilities. On average, roughly 90 percent of a utility's operations are regulated by the state commission. There are regulatory commissions in all 50 states, as well as the District of Columbia, Puerto Rico, and the Virgin Islands. The state commissions vary in size from three to seven members, and most states provide that commissioners will be appointed by the state governors. In some states, commissioners are elected. The typical term of office is six years.
Industry:Engineering
The acreage classified as irrigable for which project works have been constructed and project water is available. This acreage may change from year to year, generally increasing, as project works are completed and service is made available to additional acreage. Upon completion of the project, the irrigable acreage for service will equal the irrigable land as presented in the repayment contract or most recent project authorization. See irrigated acreage. Lands that have not been classified but which are furnished water under Special or Warren Act contracts and lease or water rental agreements are shown as a part of the irrigable area for service.
Industry:Engineering
An active fault that is judged capable of producing macro-earthquakes and exhibits one or more of the following characteristics:
(1) Movement at or near the ground surface at least once within the past 35,000 years.
(2) Macroseismicity (3.5 magnitude Richter or greater) instrumentally determined with records of sufficient precision to demonstrate a direct relationship with the fault.
(3) A structural relationship to a capable fault such that movement on one fault could be reasonably expected to cause movement on the other.
(4) Established patterns of microseismicity that define a fault, with historic macroseismicity that can reasonably be associated with that fault.
Industry:Engineering
A spillway, usually located in a saddle or depression in the reservoir rim which leads to a natural or excavated waterway, located away from the dam which permits the planned release of excess flood flow beyond the capacity of the service spillway. A control structure is seldom furnished. The crest is set at the maximum water surface elevation for a 100-year flood or some other specific frequency flood. The auxiliary spillway thus has only infrequent use. Any secondary spillway which is designed to be operated very infrequently and possibly in anticipation of some degree of structural damage or erosion to the spillway during operation.
Industry:Engineering
This analysis verifies the existence or non-existence of Safety of Dams (SOD) deficiencies at the dam. Technical memorandums (TM) are prepared which document the analyses used in the investigation of the potential SOD deficiencies. A decision memorandum (DM) is also prepared which recommends if corrective actions should be taken to mitigate the SOD deficiencies. The DVA also includes the establishment of the Design Loading Criteria which include the design earthquake and the inflow design flood (IDF).
Industry:Engineering
Contractual right given to a non-Federal entity to utilize, consistent with project purposes, water power head and storage from Reclamation projects for electric power generation.
Industry:Engineering
Volume of water that passes a given point within a given period of time. See base flow, discharge, enhancement flow, instream flow requirements, interstitial flow, minimum flow, peak flow, and return flow.
Industry:Engineering
The erosion of embankment or foundation material (soil) due to leakage. The action of water passing through or under an embankment dam and carrying with it to the surface at the downstream face some of the finer material. The progressive removal of soil particles from a mass by percolating water leading to the development of channels. The progressive development of internal erosion by seepage, appearing downstream as a hole discharging water. The process of conveying erodible embankment or foundation materials through a continuous, open "pipe" which is able to maintain a self-supported roof. The pipe normally begins at an unprotected exit and works it's way upstream (up gradient) along an erodible flow path until the reservoir is reached.
Industry:Engineering
Prying loose pieces of rock off a face or roof to avoid danger of their falling unexpectedly. An adjustment to an earthquake time history or response spectrum where the amplitude of acceleration, velocity, and/or displacement is increased or decreased, usually without change to the frequency content of the ground motion. The earthquake time history or response spectrum can be scaled based on ground motion parameters of peak acceleration, peak velocity, peak displacement, spectrum intensity, or other appropriate parameters.
Industry:Engineering
