The paper provides new and interesting insights on risk assessments for sensitive infrastructure. While risk assessments for critical infrastructure are relatively established the authors highlight the need for similar definitions and procedures for sensitive infrastructure such as special needs education facilities. The paper makes an important contribution by both defining sensitive infrastructure and developing a risk assessment process. A case study for a special needs school affected by the 2021 floods in the Ahr valley, Germany provides interesting insights on how to apply the risk assessment method developed by the authors to inform a 'build back better' approach.

The Ahr valley flood of 2021 has been one of the most severe flooding events in Germany, with the highest death toll since the coastal storm surge event of 1962, and severe destruction across the valley associated also with extreme financial loss. Deficits in the warning procedures were re-visited after this event, and major improvements like cell broadcast warnings were introduced. The question remains open if the event could have been even more devastating under (almost) the same weather situation. The spatial shift of the rainfall fields the authors conduct is a simple but very reasonable approach as input for estimating counterfactual flooding scenarios with their numerical models. In the paper they demonstrate that the flood could have been much worse in terms of the flood peaks, inundation areas and maximum depths as well as exposed assets, given a shift of the rainfall fields of only about 20 km.

This paper shows a very useful analysis of social media activities during volcanic eruptions. The authors used social sensing of Twitter posts to track social action and reaction changes throughout the 2018 eruption of Kīlauea, Island of Hawaiʻi.