the essential
The Minister of Sports spoke on one of the themes that is the Source of many questions and uncertainties about the major sporting event next summer in France (July 26-August 11).
Being able to swim in the Marne and the Seine is “one of the events of the century”, assured this Tuesday, April 23, the Minister of Sports Amélie Ouéda-Castéra on the occasion of the inauguration of a resort. treatment of rainwater in Champigny-sur-Marne (Val-de-Marne), a crucial link for the holding of certain Olympic events.
“We are ready, on time, on D-94” of the Olympic Games, and “we will also be there for our heritage,” said the minister. Downstream of the rainwater treatment plant (SDEP) inaugurated in Champigny, the Marne flows into the Seine, where open water swimming events and the swimming part of the triathlon are to take place this summer.
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The latter are giving the organizers of the Paris-2024 Games a cold sweat, with the cleanliness of the river heavily depending on the weather: in the event of a major stormy episode in the preceding days, which would result in the mixture of rainwater and rainwater being evacuated into the river. worn, they could be postponed or even canceled, as was the case last August during test events.
The measures taken to clean the Marne and the Seine should also make it possible to swim in these waterways, which they can no longer do in the Marne since 1970 and in the Seine in Paris since a prefectural decree taken in 1923.
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The objective of the SDEP is to return 700 liters per second of water into the main tributary of the Seine, or “the equivalent of an Olympic swimming pool per hour”, specified Olivier Capitanio, president of the Val-departmental council. de-Marne, present at the inauguration ceremony.
With the Austerlitz basin, built in Paris and inaugurated at the beginning of May, the Champigny station, construction of which began in the fall of 2020 at a cost of more than 53 million euros, is a major project. Fed by two water intakes, it is smaller than Austerlitz (8,000 m3 compared to 50,000 m3), but has a dual functionality: storing, like the Austerlitz basin, and cleaning.
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Underground, two lobes with a depth of up to 20 m and a diameter of 35 m receive rainwater, one to store it, the other to clean it in three stages. First, screens to separate the waste.
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Then, settling blades to separate the water from the sand and mud. Finally, the site’s main technological innovation lies in the presence of around a hundred ultraviolet lamps to obtain, its operators assure, 99.9% healthy water, free of bacteria.
