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Résumé :
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With the development of rice cultivation in the 50's, a great part of the Isle of Camargue, the central area of the Rhone river delta, was polderized. The Vaccares lagoon system (110 km(2), 65 km(2) for the Vaccares lagoon itself) represents the main part of the 'Reserve Nationale de Camargue'. Without human intervention, it is hydraulically isolated from the Rhone river and the Mediterranean sea. It receives drainage water from precipitation and flooded ricefields from its relict catchment. Our hydrological study concerned the Fumemorte catchment (65 km(2), with
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