The southern Argentine littoral is the heart of the Humid Pampa and the most productive farming region in the country, producing a large portion of the beef, cereals and dairy commodities consumed or exported.
It forms the natural limit between the provinces of Santa Fe and Entre Ríos, and empties into the Río de la Plata.
Soon after the beginning of the rain, the Ibarlucea Canal (which empties into the main course of the Ludueña, overflowed and flooded several neighbourhoods in the northwest of Rosario.
As the strong rain started to subside in Rosario, the storms were moving north towards the area of Santa Fe, the provincial capital.
At some point, the physical barriers that had been set in place against the rise of the Paraná River prevented the natural drainage of the flood waters brought by the Salado.
As the neighbouring areas were flooded and the incoming roads submerged or damaged, Santa Fe became practically isolated with the exception of the Hernandarias Subfluvial Tunnel.
Evacuees were sent to military and private facilities (such as sports clubs and schools), where they were given food and shelter, and the risk population (mainly children) was vaccinated.