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Risk Analysis and Uncertainty in Flood Damage Reduction Studies (2000) / Chapter Skim
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Appendix A: Glossary
Pages 175-180

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From page 175...
... Aleatory uncertainty- See "natural variability." Annual exceedance probability - The probability that flooding will occur in any given year considering the full range of possible annual flood discharges. Base flood - The median flood discharge having a 1 percent chance of being equated or exceeded in any given year.
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From page 176...
... For probability functions derived at ungaged locations using model or other data, the equivalent record length is estimated based on the overall "worth" or "quality" of the frequency function expressed as the number of years of record. This parameter is important in risk-based analysis because it relates directly to the uncertainty of the flood~ischarge probability function.
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From page 177...
... Log normal distribution - A two-parameter probability distribution defined by the mean and standard deviation. A nonsymmetrical distribution applicable to many kinds of data sets where the majority (more than half)
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From page 178...
... The water resources project planning alternative designed to maximize national economic development, consistent with protecting the nation's environment, and pursuant to national environmental statutes, applicable executive orders, and other federal planning requirements. The NED alternative is required by the Principles anal Guidelines (P&G, see below)
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From page 179...
... Stage-damage functions with uncertainty- Stage-clamage functions with uncertainty are computed at each structure and aggregated by damage category to damage reach index locations. Stage is elevation or locally referenced stage associated with the structure and index location.
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From page 180...
... Structural measures - Those water resources project measures designed to modify the flow of flood waters. Uncertainty - A measure of the imprecision of knowledge of variables in a project plan.
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Key Terms

  • flood insurance
  • water surface
  • damage reduction
  • insurance program
  • limit curves

  • exceedance probability
  • damage reach
  • surface profiles
  • water resources
  • flood discharge

  • national flood
  • stream flow
  • project planning
  • percent chance
  • resources project

  • median flood
  • values times
  • national economic
  • management agency
  • federal emergency

  • reduction project
  • equivalent record
  • normal distribution
  • flood waters
  • record length

  • probability distribution
  • stage associated
  • reach index
  • index location
  • emergency management


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