Sérgio R. Leite, Ludimila L. Silva & Luiz R. Gomes


Defense of Rio Grande do Sul issued the updated Meteorological Warning 254[18]


, warning of the risk of


disruption due to isolated thunderstorms and occasional heavy rains, causing rapid rises in water levels and overflows in streams, small creeks and riverside regions. On Monday the 29th, the situation spread throughout the state. On the 30th, at around 2pm,


Meteorological Warning 254 was updated, warning of a “high risk of disruption due to isolated storms and heavy, persistent rainfall”. In the days that followed, the warnings continued, always with forecasts for adverse weather.


On the night of May 2, the Federal Government recognized a state of calamity in the region. On May 3,


the State Civil Defense issued a flood alert for the Gravataí and Sinos rivers and a severe situation for the Ibirapuitã and Jacuí rivers, starting in the municipality of Dona Francisca (Figure 6). It also warned of the partial collapse of the 14 de Julho dam.


Figure 6. Alert issued by Civil Defense on May 3, 2024[INMET, 2024] During this period, several cities received between 500 and 700mm of rain, equivalent to a third of


the historical average rainfall for an entire year, and in many others the rainfall was between 300 and 400mm (Figure 7).


164 | Dam Engineering | Vol XXXIII Issue 3


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