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<br />Risk. The relationship between the consequences resulting from an adverse <br />event and its probability of occurrence. <br /> <br />Risk assessment. As applied to dam safety, the process of identifying the <br />likelihood and consequences of dam failure to provide the basis for informed <br />decisions on a course of action. <br /> <br />Rock anchor. A steel rod or cable placed in a <br />position by grout, mechanical means, or both. <br />rock bolt, but usually the rock anchor is more <br /> <br />hole drilled in rock, held in <br />In principle, the same as a <br />than 4 meters long. <br /> <br />Rock bolt. A steel rod placed in a hole drilled in rock, held in position by <br />grout, mechanical means, or both. A rock bolt can be pretensioned. <br /> <br />Slope. Inclination from the horizontal. Sometimes referred to as batter when <br />measured from vertical. <br /> <br />Sluice. An opening for releasing water from below the static head elevation. <br /> <br />Spillway. A structure over or through which flow is discharged from a reser- <br />voir. If the rate of flow is controlled by mechanical means such as gates, it <br />is considered a controlled spillway. If the geometry of the spillway is the <br />only control, it is considered an uncontrolled spillway. <br /> <br />Spillway, Auxillary. Any secondary spillway which is designed to be operated <br />very infrequently and possibly in anticipation of some degree of structural <br />damage or erosion to the spillway during operation. . <br /> <br />Spillway, Primary (or service). A spillway designed to provide continuous or <br />frequent releases from a reservoir, without significant damage to either the <br />dam or its appurtenant structures. <br /> <br />Spillway Design Flood (SDF). See Flood, Inflow Design. <br /> <br />Spillway channel. An open channel or closed conduit conveying water from the <br />spillway inlet downstream. <br /> <br />Spillway chute. A steeply sloping spillway channel that conveys discharges at <br />super-critical velocities. <br /> <br />Spillway crest. The lowest level at which water can flow over or through the <br />spillway. <br /> <br />Spillway, Fuse Plug. <br />embankment designed <br />large flood. <br /> <br />A form of auxiliary spillway consisting of a low <br />to be overtopped and washed away during an exceptionally <br /> <br />Spillway, Shaft. A vertical or inclined shaft into which water spills and <br />then is conveyed through, under, or around a dam by means of a conduit or <br />tunnel. If the upper part of the shaft is splayed out and terminates in a <br />circular horizontal weir, it is termed a bellmouth or morning glory spillway. <br /> <br />-ll- <br />