Natural Hazards and Earth System Sciences
Natural Hazards and Earth System Sciences
NHESS
Articles | Volume 25, issue 11
Articles | Volume 25, issue 11
https://doi.org/10.5194/nhess-25-4343-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-25-4343-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 25, issue 11
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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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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