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In April 1959, Uruguay suffered floods (Spanish: Inundaciones de abril de 1959 en Uruguay) that were the most severe in the modern history of Uruguay.
Rainfall lasted from March 23 till April 78 and as a consequence the Río Negro suffered an overtopping. Waters passed over the Dam of Rincón del Bonete.
References
1959 Uruguayan flood Wikipedia(Text) CC BY-SA