Articles | Volume 25, issue 11
https://doi.org/10.5194/nhess-25-4343-2025
https://doi.org/10.5194/nhess-25-4343-2025
Research article
 | 
04 Nov 2025
Research article |  | 04 Nov 2025

Reevaluating flood protection: disaster risk reduction for urbanized alluvial fans

Tamir Grodek and Gerardo Benito

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Cited articles

Alcoverro, J., Corominas J., and Gómez, M.: The Barranco de Arás flood of 7 August 1996 (Biescas, Central Pyrenees, Spain), Eng. Geol., 51, 237–255, https://doi.org/10.1016/S0013-7952(98)00076-3, 1999. 
Amaranthus, M. P., Rice, R. M., Barr, N. R., and Ziemer, R. R.: Logging and Forest Roads Related to Increased Debris Slides in Southwestern Oregon, J. Forest., 83, 229–233, https://doi.org/10.1093/jof/83.4.229, 1985. 
Baggio, T. and D'Agostino, V.: Simulating the effect of check dam collapse in a debris-flow channel, Sci. Total Environ., 816, 1–12, https://doi.org/10.1016/j.scitotenv.2021.151660, 2022. 
Ballesteros-Cánovas, J. A., Stoffel, M., Corona, C., Schraml, K., Gobiet, A., Tani, S., Sinabell, F., Fuchs, S., and Kaitna, R.: Debris-flow risk analysis in a managed torrent based on a stochastic life-cycle performance, Sci. Total Environ., 557–558, 142–153, https://doi.org/10.1016/j.scitotenv.2016.03.036, 2016. 
Bany-Mustafa, M.: Flash flood hazard and risk maps for Wadi Yutum, The Second International Symposium on Flash Floods in Wadi Systems, ISFF 25–27 October 2016, Technische Universität Berlin, Campus El Gouna, Egypt, http://hdl.handle.net/2433/228066 (last access: 17 September 2025), 2016. 
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Short summary
Protecting urbanized alluvial fan canals and levees from flooding requires effective sediment retention measures, such as check dams, terraces, and trees on steep basins. However, their effectiveness declines over time due to sedimentation and aging, increasing the risk of catastrophic breaching floods. To enhance urban resilience, we propose preserving natural mountain basins and allocating about 35 % of the alluvial fan to channel migration and sediment deposition corridors.
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