Design Flood and Flood-Prone Areas under Rating Curve Uncertainty: Area of Vieux-Ténès, Algeria
Publication: Journal of Hydrologic Engineering
Volume 26, Issue 3
Abstract
The accuracy of flood control models depends on the set of annual maximum discharge used to estimate design flood via statistical flood frequency analysis (FFA). The uncertainties associated with the discharge time series from stage records are often ignored. Indeed, the uncertainty associated with discharge estimation is not addressed in many of the previous hydraulic risk analyses. In this study, we provide a quantitative approach to rigorously explore the effect that the rating curve uncertainty has on the design flood estimation and the flood hazard mapping. The town of Vieux-Ténès, Algeria, located near the mouth of the Allala River, was used as a case study. Despite the presence of concrete flood protection walls, several floods caused severe damage over the last decades in the town. Multisegment Bayesian rating curve, based on the Bayesian rating curve (BaRatin) method, was used to compute the rating curve uncertainty of the Allala hydrometric station, allowing for the creation of a new time series of annual maximum discharge for the 1973–2017 time period and the estimation of the design flood for different return periods by FFA. The Hydrologic Engineering Center’s river analysis system (HEC-RAS) was used to model the water levels for different locations based on steady flow analysis, using them to define flood-prone areas and an effective protection system. We found that estimations of the flooded area varied between and 15% when assessing rating curve uncertainties. Results highlighted that the existing flood control system is not sufficient to protect the inner city against flood risks, especially in the lower-lying areas of the flooded area.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This paper is dedicated to the memory of our dear coauthor, Professor Mohamed Remaoun, who passed away while this paper was being peer reviewed. The authors wish to thank the National Agency of Water Resources for providing material and data required in this study, as well as to Jerome Le Coz [Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture (IRSTEA)] for kindly providing us with the last version of BaRatin. Roberto Serrano-Notivoli is funded by the Spanish Ministry of Science, Innovation and Universities (Grant No. FJCI-2017-31595). The authors also wish to acknowledge the anonymous reviewers and editors for their valuable comments and suggestions, which greatly improved the paper.
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Journal of Hydrologic Engineering
Volume 26 • Issue 3 • March 2021
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© 2020 American Society of Civil Engineers.
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Received: Apr 5, 2020
Accepted: Oct 22, 2020
Published online: Dec 31, 2020
Published in print: Mar 1, 2021
Discussion open until: May 31, 2021
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