Some of La Plata's residents set up roadblocks to protect their neighbourhoods from looters.
Officials said 400 extra police officers and soldiers would be deployed to La Plata.
BBC: Argentina floods 'catastrophe' for La Plata, Buenos Aires
On Wednesday night, some of La Plata's residents set up roadblocks to "protect their neighbourhoods from looters".
BBC: Argentina floods 'catastrophe' for La Plata, Buenos Aires
At least 46 died Wednesday in and around the city of La Plata, Gov. Daniel Scioli said.
The flooding threatened to ruin food supplies across La Plata's metropolitan area, which has nearly 1 million people.
London Irish scrum-half Alfredo Lalanne, Montpellier prop Juan Figallo and Universitario La Plata second rower Mariano Galarza drop out.
That would be 35 years after the Animas-La Plata scheme was first approved.
Provincial officials said 40cm (16in) of rain fell on La Plata in the space of two hours late on Tuesday night.
So far more than 40 of the victims in La Plata, about 60km (40 miles) south of the capital, have been identified.
Associated Press Writer Cristian Kovadloff in La Plata and Almudena Calatrava, Debora Rey and Michael Warren in Buenos Aires contributed to this story.
President Cristina Fernandez arrived by helicopter in Tolosa, a La Plata neighborhood where she grew up and where her mother was among those evacuated.
On Wednesday, President Cristina Fernandez de Kirchner visited Tolosa, the worst-hit area of La Plata, where she grew up and where her mother still lives.
More than 3, 000 people had to leave their homes and 80, 000 lost electricity, with two of La Plata's hospitals also affected by the power cuts.
The La Plata refinery suspended operations as a result, and Argentina's YPF oil company said an emergency team was evaluating how to get it restarted.
President Cristina Fernandez de Kirchner on Wednesday visited Tolosa, the worst affected neighbourhood of La Plata, where she grew up and where her mother still lives.
BBC: Argentina floods 'catastrophe' for La Plata, Buenos Aires
More than 3, 000 people had to leave their homes and 80, 000 still do not have electricity, with two of La Plata's hospitals also affected by the power cuts.
BBC: Argentina floods 'catastrophe' for La Plata, Buenos Aires
The heaviest rain almost 16 inches (400 millimeters) in just a few hours, beating historical records for the entire month of April hit provincial La Plata overnight.
At least 2, 500 people were evacuated from their homes to about 20 centers in the La Plata area, which is about 37 miles (60 kilometers) southeast of Argentina's capital.
The report is completed by a series of case studies on selected cities, regions and countries (Istanbul, Cameroon, Spain, the Netherlands, Sudan, Swaziland and basins of La Plata and Lake Merin).
The Argentinian and Uruguayan tradition of the Tango, now familiar around the world, was developed by the urban lower classes in Buenos Aires and Montevideo in the Rio de la Plata basin.
Wedged on a narrow spit of land near the marshy flatlands of the Rio de la Plata, the abandoned docklands had no streets, a few gutted buildings and "chest-high grass, " Austin Hearst, an early investor, remembers.
Punta del Este, an hour and a half from Montevideo, has condominiums and high rises lining the beaches that reach out into the water, with the Rio de la Plata on one side and the Atlantic Ocean on the other.
Macri said Wednesday that the only solution is for the constantly warring governments to work together on expensive and long-term public works projects, creating huge underground drainage pipes to carry increasingly common torrential rains out to the Rio de la Plata.
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