In MOVIDA, damage assessment is carried out differently for the various categories and sub-categories of exposed assets identified by the Floods Directive. For each category, a different level of analysis is achieved, according to the current state of the art on flood damage modelling. In detail, the evaluation may refer to actual expected damage or to potential/maximum damage. Moreover, damage may be quantified in quantitative or qualitative terms (i.e., high, medium, low damage); in the first case, damage assessment can support the comparison of different mitigation strategies by means of cost-benefit or multi-criteria analyses. In the second, cost-benefit analyses are not supported anymore but damage evaluation can still feed multi-criteria approaches. A final remark regards the possibility of evaluating damage in monetary terms only for tangible assets (Figure 1).
Fig. 1. Level of analysis achieved in MOVIDA for the different categories of assets
The MOVIDA procedure has been implemented in all areas of potential significant flood risk (APSFRs) in the Po District, by means of the ISYDE tool. The results of the analysis can be found in the reports prepared for each APSFR, as annexes of the updated FRMP of the Po River District (https://pianoalluvioni.adbpo.it/piano-gestione-rischio-alluvioni-2021 ).
Each report shows the results of the flood damage assessment in the area, to the different categories of exposed assets, by means of tables, charts, and maps. Specifically, two types of outcomes are provided:
the overall expected damage, at the APSFR level, in addition to the total value of the main exposure and vulnerability variables, for all the three hazard scenarios indicated by the Floods Directive;
the spatial distribution of the damage within the study area only for the most significant hazard scenario or, in the absence of this, the scenario with a medium probability of occurrence (typically corresponding to the reference scenario in the design of mitigation measures). The spatial distribution of the outputs for all scenarios is available in the database of the project.
The maps reported below are an example of the spatial distribution of the expected damage or exposure to the different considered sectors within the APSFR Panaro River, for the medium probability scenario (return period = 200 years).
Population
Resident population (per km2 of flooded area), at the census block scale.
Roads and Railways
Impact on the road and railway networks, at the individual section scale.
Strategic buildings
Identification of strategic buildings.
Cultural heritage
Damage index for cultural heritage, at the census block scale (i.e. weighted sum of the assets in the flooded portion of the census polygon divided by the inundated area).
Environment
Classification of environmental areas based on the ecosystem service provided.
Residential buildings
Monetary damage to the residential buildings (per km2 of flooded area), at the census block scale.
Commerce and Industry
Economic value of the commercial and industrial activities (per km2 of flooded area), at the census block scale.
Crops
Maximum expected damage to maize, wheat, barley, grassland and rice (per km2 of flooded area), at the census block scale. This scenario refers to a May flood.
Pollution sources
Identification of potential pollution sources (Na-tech sites).