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Flooding and river maintenance in southern Brazil

Updated 2 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-10 14:46 UTC → 2026-09-11 18:04 UTC · added removed

In late August 2026, authorities in southern Brazil initiated preventative measures to mitigate flooding risks. In Santa Catarina, the CT SATC technological center identified 590 points of obstruction in the Urussanga River across nine municipalities. Concurrently, the local government in São João Batista began dredging the Tijucas River to remove an estimated 360,000 cubic meters of sediment and stones, aiming to counter the effects of heavy rainfall and El Niño. By early September, heavy rainfall led to active flooding in the region. In Rio Negro, Paraná, the Rio Negro river exceeded 8 meters, displacing 122 people. In Santa Catarina, the Rio Canoas reached a flood alert level of 6.17 meters in Otacílio Costa, flooding streets and local facilities. Civil Defense officials reported that saturated soil and difficult drainage in the river basin maintained critical conditions despite pauses in precipitation. On September 9, heavy rainfall continued severe weather conditions intensified due to drive rising river levels across Santa Catarina. In Blumenau, the Itajaí-Açu River rose 1.03 meters over a 12-hour period formation of an extratropical cyclone in the ocean between the coasts of Santa Catarina and Rio Grande do Sul. The Civil Defense issued high to reach 3.52 meters. very high risk alerts for flooding, flash floods, roof damage, power outages, and falling trees across the Grand West, Itajaí Valley, North Plateau, and North Coast. In the northern region, specifically Três Barras, more than 100 people have sought shelter as local facilities reached capacity. The the Rio Canoinhas and Rio Negro reached 8 meters, and critical levels, with the Rio Canoinhas was recorded at 7.14 Negro hitting 8 meters. Meteorological forecasts indicate continued instability due to This has displaced over 100 people into shelters in Três Barras. Consequently, the Public Ministry of Santa Catarina launched a low-pressure system formal proceeding to monitor municipal assistance and ensure the rights of affected populations. Additionally, the National Institute of Meteorology (INMET) issued a cold front, with risks red alert for Western Santa Catarina, warning of persistent rain, thunderstorms, intense storms, hail, and potential hail. isolated tornadoes.

Versions

  1. 2026-09-11 18:04 UTC Flooding and river maintenance in southern Brazil
  2. 2026-09-10 14:46 UTC Flooding and river maintenance in southern Brazil
  3. 2026-09-04 15:33 UTC Flooding and river maintenance in southern Brazil

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