4. Living with uncertainty: The tragic #Derna flood highlights the need for spatially distributed flood prevention and warning systems and Nature-Based Solutions, such as constructing dense infrastructure away from floodplains.
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3. Frequency and re-analysis: The #Derna flood underscores the necessity of revisiting rain and flood return periods. Data, methods, and land use are evolving and require updates.
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2. Dam Hazard: The damage caused by the dam breach was approximately 20 times greater than in a simulated no-dam scenario (the ‘natural’ flood).
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1. Extreme but expected: The rain and flood magnitude in #Derna had a return period of tens of years, unlike previous estimates, which indicated a much rarer flood. 🧵
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