2011 Flood in Brazil: No Single Major Event — But Deadly Landslides in Rio de Janeiro

There was no single "2011 flood" affecting all of Brazil. However, January 2011 brought catastrophic floods and landslides to the Serrana region of Rio de Janeiro state — one of Brazil's deadliest natural disasters.

January 2011 Rio de Janeiro Disaster

• Trigger: Extreme rainfall (250–300 mm in 24 hrs) on saturated soil.
• Cities hit: Teresópolis, Petrópolis, Nova Friburgo, Sumidouro, São José do Vale do Rio Preto.
• Deaths: 918 confirmed (official) — estimates up to 1,000+.
• Displaced: ~30,000 homeless.
• Damage: Entire neighborhoods buried; roads, bridges, water/sewer destroyed.

Other 2011 Flood Events

• Northeast (Apr–Jun): Floods in Pernambuco, Alagoas — 50+ deaths, 200K displaced.
• Amazon (year-round): Seasonal flooding (normal) — 2011 high but not record.
• South (Sep): Santa Catarina/RS floods — 10+ deaths.

Why "2011 Flood" Usually Means the Serrana Tragedy

Scale, lethality, media coverage, and policy impact (new early warning, risk mapping, housing programs) make it the reference event.

Brazil's size means "flood in 2011" is like "flood in 2011 in the US" — which region? The Serrana disaster is the answer for Brazil.