The National Flood-Frequency Program -- Methods for Estimating Flood Magnitude and Frequency in Rural Areas in Louisiana, 2001

Mason, Robert R.; Sumioka, S.S.

doi:10.3133/fs09901

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“…Notably, a devastating flood affected the Vermilion Basin in August 2016 whose ±500 mm, 2-day rainfall approximated the 500-year (0.2% annual exceedance probability) project design flood (Brown et al, 2020). Other notable floods have occurred in the region including the floods of 1927, 1940, and 2001(FEMA, 2018.…”

Section: Study Area Descriptionmentioning

confidence: 99%

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Assessment of inland flood hazard sensitivity to hydrological intensification in coastal watersheds

Miller

2022

Front. Water

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IntroductionIntensification of the hydrologic cycle induced by climate variability and landscape modification is expected to increase the frequency of extreme flood events. Multi-jurisdictional approaches to manage inland flood risks at watershed scales demand the ability to objectively assess not only future flood potentials, but to also set priorities based upon multiple factors such as the stream channels most sensitive to hydrologic stress.MethodsThis study presents a method to estimate flood hazard sensitivities to increasing stormwater runoff due to hydrologic intensification (e.g., urbanization, climate effects) on local and watershed scales. The method is demonstrated in the low-gradient inland watershed regions of southwestern coastal Louisiana, USA. Utilizing highly detailed numerical models from the Federal Emergency Management Agency (FEMA), absolute and relative flood sensitivities were calculated for 45 flood-prone stream channels in the Lafayette, LA region. Channel sensitivities to flood hazards induced by changes in the 10-yr (10% annual exceedance probability) flood flows were quantified by analysis of 485 scenarios developed using a downward counterfactual scaling strategy.Results and discussionRelying entirely upon publicly available numerical models and input datasets, the study revealed key information about the relationship between estimable hydraulic characteristics (e.g., conveyance, resistance, and flow) and absolute and relative flood hazard sensitivity measures on a per-channel basis. Information from the subset of detailed numerical models was efficiently leveraged to provide a regional map of relative flood sensitivities. The methodology is robust and can be applied in very general settings to address the concern of hydrologic intensification in practical flood risk management applications.

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Section: Study Area Descriptionmentioning

confidence: 99%

“…The basic procedure required as inputs (1) a channel network for the region, and (2) estimates of Q 100 for each channel within the network. Estimates of Q 100 were obtained from the following variant of the regional regression peak discharge relationship for SW LA (Mason and Sumioka, 2001):…”

Section: Regionalization Of Relative Sensitivity To Local Runomentioning

confidence: 99%

Assessment of inland flood hazard sensitivity to hydrological intensification in coastal watersheds

Miller

2022

Front. Water

View full text Add to dashboard Cite

show abstract

The National Flood-Frequency Program -- Methods for Estimating Flood Magnitude and Frequency in Rural Areas in Louisiana, 2001

Cited by 1 publication

References 0 publications

Assessment of inland flood hazard sensitivity to hydrological intensification in coastal watersheds

Assessment of inland flood hazard sensitivity to hydrological intensification in coastal watersheds

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