Flood Frequency Analysis in the United States: Time to Update

Stedinger, Jery R.; Griffis, V. W.

doi:10.1061/(asce)1084-0699(2008)13:4(199)

Cited by 123 publications

(79 citation statements)

References 30 publications

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“…Evaluating flood frequency and determining the design flood are the final goals for hydrological analysis and the beginning of integrated flood control [1]. A design flood is used in comprehensive flood management to assess the flood defense capacities of facilities and to protect human lives and properties within a watershed [2].…”

Section: Introductionmentioning

confidence: 99%

Flood Frequency Analysis for the Annual Peak Flows Simulated by an Event-Based Rainfall-Runoff Model in an Urban Drainage Basin

Ahn

Cho

Kim

et al. 2014

Water

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Abstract:The proper assessment of design flood is a major concern for many hydrological applications in small urban watersheds. A number of approaches can be used including statistical approach and the continuous simulation and design storm methods. However, each method has its own limitations and assumptions being applied to the real world. The design storm method has been widely used for a long time because of the simplicity of the method, but three critical assumptions are made such as the equality of the return periods between the rainfall and corresponding flood quantiles and the selections of the rainfall hyetograph and antecedent soil moisture conditions. Continuous simulation cannot be applied to small urban catchments with quick responses of runoff to rainfall. In this paper, a new flood frequency analysis for the simulated annual peak flows (FASAP) is proposed. This method employs the candidate rainfall events selected by considering a time step order of five minutes and a sliding duration without any assumptions about the conventional design storm method in an urban watershed. In addition, the proposed methodology was verified by comparing the results with the conventional method in a real urban watershed. OPEN ACCESSWater 2014, 6 3842 Keywords: design storm method; continuous simulation method; flood frequency analysis; urban drainage basin

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Section: Introductionmentioning

confidence: 99%

Flood Frequency Analysis for the Annual Peak Flows Simulated by an Event-Based Rainfall-Runoff Model in an Urban Drainage Basin

Ahn

Cho

Kim

et al. 2014

Water

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“…Not only are concrete references preferred for describing flood risk (Bell and Tobin, 2007), but flood probabilities and corresponding frequency are inherently uncertain (e.g. Appendices A1.1 -A1.3, Di Baldassarre et al, 2010; Kjeldsen et al, 2014;Merwade et al, 2008;Merz and Blöschl, 2008;Stedinger and Griffis, 2008).…”

Section: Discussion and Recommendationsmentioning

confidence: 99%

Going beyond the Flood Insurance Rate Map: insights from flood hazard map co-production

Luke¹,

Sanders²,

Goodrich³

et al. 2017

Preprint

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Abstract. Flood hazard mapping in the United States (US) is deeply tied to the National Flood Insurance Program (NFIP).Consequently, publicly available flood maps provide essential information for insurance purposes, but do not necessarily provide relevant information for non-insurance aspects of flood risk management (FRM) such as public education and emergency planning. Recent calls for flood hazard maps that support a wider variety of FRM tasks highlight the need to deepen our understanding about the factors that make flood maps useful and understandable for local end-users. In this study, social scientists 5 and engineers explore opportunities for improving the utility and relevance of flood hazard maps through the co-production of maps responsive to end-users' FRM needs. Specifically, two-dimensional flood modeling produced a set of baseline hazard maps for stakeholders of the Tijuana River Valley, US, and Los Laureles Canyon in Tijuana, Mexico. Focus groups with natural resource managers, city planners, emergency managers, academia, non-profit, and community leaders refined the baseline hazard maps by triggering additional modeling scenarios and map revisions. Several important end-user preferences emerged, 10 such as 1) legends that frame flood intensity both qualitatively and quantitatively, and 2) flood scenario descriptions that report flood magnitude in terms of rainfall, streamflow, and its relation to an historic event. Regarding desired hazard map content, end-users' requests revealed general consistency with mapping needs reported in European studies and guidelines published in Australia. However, requested map content that is not commonly produced included: 1) standing water depths following the flood, 2) the erosive potential of flowing water, and 3) pluvial flood hazards, or flooding caused directly by rainfall. We 15 conclude that the relevance and utility of commonly produced flood hazard maps can be most improved by illustrating pluvial flood hazards and by using concrete reference points to describe flooding scenarios rather than exceedance probabilities or frequencies.

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“…There has been an extended discussion of possible improvements in the methodology of Bulletin 17B, see [7][8][9][10][11][12]. The issue here, however, is in the possible changes due to additional data when applying the methodology used in analyzing the original data.…”

Section: Methodsmentioning

confidence: 99%

Stability of Confidence Levels for Flood Frequencies Using Additional Data

Hromadka¹,

Whitley²,

Smith

2011

JWARP

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A comparison of flood values based on prior data and new additional data at various confidence levels is given for five representative sites in Los Angeles, California. The methodology uses computer simulations to give the confidence level values and flood frequency curves. These calculations show confidence level increases roughly in the range of 5% to 10% using some quarter of a century of additional data.

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Flood Frequency Analysis in the United States: Time to Update

Cited by 123 publications

References 30 publications

Flood Frequency Analysis for the Annual Peak Flows Simulated by an Event-Based Rainfall-Runoff Model in an Urban Drainage Basin

Flood Frequency Analysis for the Annual Peak Flows Simulated by an Event-Based Rainfall-Runoff Model in an Urban Drainage Basin

Going beyond the Flood Insurance Rate Map: insights from flood hazard map co-production

Stability of Confidence Levels for Flood Frequencies Using Additional Data

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