- Industry: Government
- Number of terms: 10940
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A buttress dam in which the upstream part is a relatively thin flat slab usually made of reinforced concrete.
Industry:Energy
A phenomenon in which a cohesionless soil loses shear strength during earthquake ground vibrations and acquires a degree of mobility sufficient to permit intermittent movement up to several feet, as contrasted to liquefaction where continuous movements of several hundred feet are possible.
Industry:Energy
Measures temperature using electrical principles of changing resistance in a copper wire as temperature changes, a semiconductor material that changes its resistance very markedly with temperature, or when two dissimilar metal wires are joined together, a change in temperature produces a change in voltage. These can be resistance temperature devices, thermistors, and thermocouples.
Industry:Energy
The earthquake, expressed in terms of magnitude and closest distance from the dam site or in terms of the characteristics of the time history of free-field ground motions, for which the safety of the dam and critical structures associated with the dam are to be evaluated. In many cases, this earthquake will be the maximum credible earthquake to which the dam will be exposed. However, in other cases where the possible sources of ground motion are not easily apparent, it may be a motion with prescribed characteristics selected on the basis of a probabilistic assessment of the ground motions that may occur in the vicinity of the dam. To be considered safe, it should be demonstrated that the dam can withstand this level of earthquake shaking without release of water from the reservoir.
Industry:Energy
A vertical or inclined shaft into which water spills and then is conveyed through, under, or around a dam by means of a conduit or tunnel. If the upper part of the shaft is splayed out and terminates in a circular horizontal weir, it is termed a bellmouth or morning glory spillway.
Industry:Energy
An area of the foundation systematically grouted to a uniform shallow depth.
Industry:Energy
A dam impounding a reservoir from which water is released to regulate the flow downstream.
Industry:Energy
