Flood Frequency Confidence Bounds — Art, Science, or Guess!

Countryman, Joseph D.; Tustison, Ben

doi:10.1061/40976(316)562

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Uncertainty in the flood frequency analysis may arise not only from limited data, but also from (i) stream gauge measurement errors (Neppel et al, 2010), (ii) possible nonstationarity of the series due to climate change (Khaliq et al, 2006) and (iii) uncertain fitting of a discharge-frequency (Q-f) relationship to the AMFS 1967-2009 dataset (Countryman and Tustison, 2008). Here, only the latter uncertainty was modelled and simulated.…”

Section: Flood Frequency Analysismentioning

confidence: 99%

Ranking sources of uncertainty in flood damage modelling: a case study on the cost‐benefit analysis of a flood mitigation project in the Orb Delta, France

Saint-Geours

Grelot

Bailly

et al. 2013

J Flood Risk Management

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International audienceCost-benefit analyses (CBA) of flood management plans usually require estimating expected annual flood damages on a study area, and rely on a complex modelling chain including hydrological, hydraulic and economic modelling as well as GIS-based spatial analysis. As most model-based assessments, these CBA are fraught with uncertainty. In this paper, we consider as a case-study the CBA of a set of flood control structural measures on the Orb Delta, France. We demonstrate the use of variance-based global sensitivity analysis (VB-GSA) to i) propagate uncertainty sources through the modelling chain and assess their overall impact on the outcomes of the CBA, and ii) rank uncertainty sources according to their contribution to the variance of the CBA outcomes. All uncertainty sources prove to explain a significant share of the overall output variance. Results show that the ranking of uncertainty sources depends not only on the economic sector considered (private housing, agricultural land, other economic activities), but also on a number of averaging-out effects controlled by the number and surface area of the assets considered, the number of land use types or the number of damage functions

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Section: Flood Frequency Analysismentioning

confidence: 99%