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Hydros 25 Underway as FR-Alert To Sound Across Île-de-France on Wednesday

Hydros 25 evaluates how quickly authorities can warn residents during a simulated Seine surge.

Overview

  • After an initial broadcast in Seine-et-Marne on Monday, wider FR-Alert tests are scheduled Wednesday with time windows in Essonne (10:00–11:00), Seine-Saint-Denis (late morning to early afternoon), Val-de-Marne (around 11:30–12:00) and Paris’ Beaugrenelle (13:00–13:30).
  • The alert will arrive as a loud notification that overrides silent mode, requires no installation, clearly states it is a test, and asks recipients not to contact emergency services.
  • Authorities will attach a questionnaire to collect user feedback and assess the reach and performance of the alerting system.
  • On-the-ground drills in Paris on Monday included a role-play evacuation of an apartment building with volunteers, civil protection and Red Cross support, and RATP installing flood barriers at a metro entrance.
  • Officials frame the exercise against the risk of a centennial Seine flood, with impact estimates varying from about 630,000 people directly flooded to roughly one million affected depending on scenario.