Laserfiche WebLink
<br />- I <br /> <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 />Part 2. - Risk Terminology <br />(A comprehensive Risk Glossary is given in the Guidelines on Risk Assessment) <br /> <br />TERM <br /> <br />DEFINITION <br /> <br />u j <br />I <br /> <br />Acceptable risk <br /> <br />Acceptable risk is a risk which, for the purposes of lire or <br />work, everyone who might be impacted is prepared to <br />accept assuming no changes in risk control mechanisms. <br />[HSE, 1992, UK] <br /> <br />ALARP <br /> <br />As Low as Reasonably Practicable Principle, This states <br />that risk, lower than the Limit of acceptability, are tolerable <br />only if the risk reduction is impracticable or if its cost is <br />grossly disproportionate (depending on the level of risk) to <br />the improvement gained [HSE, UK] <br /> <br />Annual <br />Probability (AEP) <br /> <br />Exceedance Probability at which an event of specified magnitude will <br />be equalled or exceeded in any year <br /> <br />Commensurable risks <br /> <br />Risks that are measurable by the same standards as others, <br />In risk analysis, commonly refers to effects that are <br />measurable in dollar terms <br /> <br />Conditional probability <br /> <br />The probability of an outcome, given the occurrence of <br />some event. For example, given that a flood has reached <br />the crest of an embankment dam, the probability of the dam <br />failing is a conditional probability <br /> <br />Consequences <br /> <br />In relation to risk analysis, the outcome or result of a risk <br />being realised. Impacts in the downstream as well as <br />upstream areas of the dam resulting from failure of the dam <br />or its appurtenances <br /> <br />t Dambreak Affected Zone <br /> <br />That zone of flooding where the changes in depth and <br />velocity of flooding due to dambreak are such that there is <br />potential'for incremental loss of life. The Dambreak <br />Affected Zone is sometimes limited to those areas where <br />dam break causes a rise in level of floodwaters greater than <br />300mm <br /> <br /> <br />Dambreak analysis <br /> <br />An analysis which provides an estimation of downstream <br />flooding effects resulting from dam failure. The analysis <br />includes a dam breach analysis and the routing of the <br />dambreak hydrograph through the downstream channel <br /> <br />Decision maker <br /> <br />The person or organisational unit that decides on a course <br />of action in relation to a dam on the basis of a range of <br />considerations which may include a risk analysis <br /> <br />32 <br /> <br />ANCOLD Guidelines on Selection of an Acceptable flood Capacity for Dams <br />