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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />! I <br />I <br />I <br /> <br />TERM <br /> <br />DEFINITION <br /> <br />Scenario <br /> <br />A unique combination of states, such as initiating event, <br />conCUIIe1lt wind state, prior storage state; gate operating <br />state, failure mode, downstream and tributary concurrent <br />flows. <br /> <br />Societal risk criterion <br /> <br />Thesocially acceptable level of risk in terms of events that <br />impact on society at a community, regional or national <br />level <br /> <br />System response <br /> <br />How a dam responds, measured as probability of failure, <br />to a given scenario of applied loads and concurrent <br />conditions <br /> <br />Tolerable risk <br /> <br />The maximum risk that society can live with. Higher <br />risks cannot be accepted <br /> <br />Warning Time (W1) <br /> <br />Warning Time is the time elapsed between initiation of a <br />formal warning by public safety officials through radio, <br />TV, direct warning, or otherwise, for a selected PAR to <br />evacuate, and the time at which the leading wave of the <br />failure flood reaches the PAR (USBR, 19&9) <br /> <br />36 <br /> <br />ANCOLD Guidelines on Selection of an Acceptable flood Capacity for Dams <br />