{"id":18569,"date":"2024-11-28T09:34:32","date_gmt":"2024-11-28T08:34:32","guid":{"rendered":"https:\/\/seyssel74.com\/?p=18569"},"modified":"2024-12-04T09:45:13","modified_gmt":"2024-12-04T08:45:13","slug":"restauration-hydraulique-de-la-zone-humide-de-seyssel","status":"publish","type":"post","link":"https:\/\/seyssel74.com\/index.php\/2024\/11\/28\/restauration-hydraulique-de-la-zone-humide-de-seyssel\/","title":{"rendered":"Restauration hydraulique de la zone humide de Seyssel"},"content":{"rendered":"\n

Des travaux de restauration hydraulique de la zone humide du torrent des Usses, \u00e0 Seyssel, ont \u00e9t\u00e9 r\u00e9alis\u00e9s mercredi 27 novembre 2024, pilot\u00e9s par le Syr’Usses<\/strong>.<\/p>\n\n\n\n

Ces am\u00e9nagements font suite aux constats de d\u00e9gradation et de comblement progressif de cette zone humide \u00e0 enjeux, situ\u00e9e sur la partie aval du bassin versant des Usses, en rive gauche des Usses. Compos\u00e9e de boisements alluviaux d\u2019int\u00e9r\u00eat patrimonial, et s\u00e9par\u00e9e du cours des Usses par la RD992, cette zone humide abrite une des plus importantes population de grenouilles rousses du D\u00e9partement. Depuis plusieurs ann\u00e9es, lors des crues des Usses, il est constat\u00e9 d\u2019importants d\u00e9p\u00f4ts de sables au sein de la zone alluviale, ainsi que la progression rapide de la renou\u00e9e du japon, esp\u00e8ce hautement invasive. Une \u00e9tude hydraulique et \u00e9cologique, rendue en 2022, a mis en \u00e9vidence l\u2019effet n\u00e9faste sur le milieu des ouvrages hydrauliques cr\u00e9\u00e9s sous la RD992.
Initialement pr\u00e9vus pour assurer la transparence hydraulique du remblai routier lors des crues des Usses, ces ouvrages ne contribuent finalement pas \u00e0 la bonne alimentation en eau de la zone alluviale, celle-ci \u00e9tant essentiellement aliment\u00e9e par les eaux souterraines. Au contraire, \u00e0 chaque crue importante, ils laissent transiter des sables et des fragments de renou\u00e9es du japon qui alt\u00e8rent peu \u00e0 peu le bon fonctionnement de la zone alluviale.<\/p>\n\n\n\n

Pour rem\u00e9dier \u00e0 cette situation, des travaux ont donc \u00e9t\u00e9 r\u00e9alis\u00e9s ce 27 novembre 2024 pour obstruer totalement 2 ouvrages hydrauliques lat\u00e9raux. De plus, l\u2019ouvrage hydraulique pr\u00e9sent \u00e0 la sortie de la zone alluviale a \u00e9t\u00e9 rehauss\u00e9, pour permettre une r\u00e9tention d\u2019eau au sein de la zone humide sur une plus grande p\u00e9riode. Le dispositif mis en place consiste en la pause de batardeaux amovibles, faciles \u00e0 manipuler. A noter qu\u2019avant de mettre en place ces dispositifs, le Syr\u2019Usses s\u2019est assur\u00e9 que la condamnation des ouvrages n\u2019allait pas causer de pr\u00e9judice \u00e0 la faune locale, qui transite en partie sous la RD992 via ces ouvrages.<\/p>\n\n\n\n

Des suivis sont en cours pour attester de l\u2019efficacit\u00e9 des travaux r\u00e9alis\u00e9s.<\/p>\n\n\n\n

Le service des routes du D\u00e9partement de la Haute-Savoie a \u00e9t\u00e9 associ\u00e9 \u00e0 cette d\u00e9marche, ainsi que la Compagnie nationale du Rh\u00f4ne, propri\u00e9taire des parcelles en zone humide et financeur de ces travaux, aux c\u00f4t\u00e9 de l\u2019Agence de l\u2019eau Rh\u00f4ne M\u00e9diterran\u00e9e Corse.<\/p>\n\n\n\n

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Des travaux de restauration hydraulique de la zone humide du torrent des Usses, \u00e0 Seyssel, ont \u00e9t\u00e9 r\u00e9alis\u00e9s mercredi 27 novembre 2024, pilot\u00e9s par le Syr’Usses. Ces am\u00e9nagements font suite aux constats de d\u00e9gradation et de comblement progressif de cette zone humide \u00e0 enjeux, situ\u00e9e sur la partie aval du bassin versant des Usses, en 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