Paris invested 1.4 billion euros in building infrastructure to catch stormwater to prevent bacteria-laden wastewater from entering the Seine, ensuring safety for athletes during the Olympics.
A giant underground water storage basin near Austerlitz train station can hold the equivalent of 20 Olympic swimming pools of dirty water, which will be treated to improve the Seine's cleanliness.
Despite efforts, heavy rain spells could still push E. coli levels beyond safety limits, highlighting the ongoing challenge of managing stormwater in old cities like Paris with combined sewer systems.
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