RGA: municipal baseline, hydroclimatic trajectories and typology

This map explores French municipalities through several distinct signals: RGA exposure, drought CatNat decisions, geology, topography and hydroclimatic trajectories. The Long-term trends 1960–2017 and Recent deviations 2018–2025 tabs compare long-term trajectories with recent departures. The Compare and Typology tabs are then used to identify overlaps, divergences and signal combinations.

Exposure and physical context
CatNat decisions
This tab tests overlaps between long-term trajectories, recent deviations, RGA exposure and drought CatNat decisions. The question is not only “where is everything high?”, but rather: where do signals reinforce each other, where do they diverge, and where is there recent CatNat activity without an obvious hydroclimatic counterpart?
Expert options — select signals one by one
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This synthesis groups municipalities by families of signals: RGA exposure, geology, soil drought, recent weather, topography and CatNat orders. It does not predict cracks and does not replace parcel-scale analysis. The municipal sheet adds a dynamic reading: does the recent signal extend the long-term trajectory, or does it appear instead as a break?
Long-term change calculated at municipal scale between 1960 and 2017.
CatNat data
Insurance-related data
Here Δ means the deviation between the observed 2018–2025 period and the extension of the 1960–2017 trend. Signs are oriented so that positive values indicate a stronger signal: drier years, hotter summers, more days above 35°C or a stronger hydrological contrast.
Tab under preparation. The aim is to cross current RGA susceptibility with future hydroclimatic projections. It will not predict cracks in 2050, but identify municipalities where an already sensitive context could be amplified by future climate.
Selected municipality