{"id":20191,"date":"2025-05-07T11:43:44","date_gmt":"2025-05-07T09:43:44","guid":{"rendered":"https:\/\/seyssel74.com\/?p=20191"},"modified":"2025-05-07T11:43:44","modified_gmt":"2025-05-07T09:43:44","slug":"gestion-sedimentaire-du-haut-rhone-franco-suisse","status":"publish","type":"post","link":"https:\/\/seyssel74.com\/index.php\/2025\/05\/07\/gestion-sedimentaire-du-haut-rhone-franco-suisse\/","title":{"rendered":"Gestion s\u00e9dimentaire du Haut Rh\u00f4ne franco-suisse"},"content":{"rendered":"\n<p><strong>Du 15 mai au 27 mai 2025,\u00a0le niveau du Rh\u00f4ne va fortement baisser. Savez-vous pourquoi\u00a0?<\/strong><br><strong>Le Rh\u00f4ne, un fleuve am\u00e9nag\u00e9 pour produire de l&rsquo;\u00e9lectricit\u00e9<\/strong><\/p>\n\n\n\n<p>Du barrage de Ch\u00e8vres \u00e0 l\u2019aval de Gen\u00e8ve en 1896 jusqu\u2019\u00e0 l\u2019usine hydro\u00e9lectrique de Sault-Br\u00e9naz mise en eau en 1986 , le transit des mat\u00e9riaux entre Gen\u00e8ve et les embouchures du fleuve sur la mer M\u00e9diterran\u00e9e a \u00e9t\u00e9 modifi\u00e9.<br><br>S\u00e9diments, boues en provenance de l\u2019Arve (affluent de la rive gauche du Rh\u00f4ne) en aval imm\u00e9diat de Gen\u00e8ve constituent un volume moyen estim\u00e9 \u00e0 700\u00a0000 m\u00b3\/an.\u00a0 Pour \u00e9viter le comblement de la retenue suisse de Verbois, exposant la ville de Gen\u00e8ve \u00e0 un risque significativement accru d\u2019inondations, les Services Industriels\u00a0Genevois (SIG) et CNR (Compagnie Nationale du Rh\u00f4ne) ont convenu d&rsquo;un\u00a0sc\u00e9nario de gestion mixte\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>un abaissement partiel triennal des retenues de Verbois et de Chancy-Pougny accompagn\u00e9 par une gestion sp\u00e9cifique des barrages fran\u00e7ais<\/li>\n\n\n\n<li>un accompagnement du transit s\u00e9dimentaire lors des crues de l&rsquo;Arve<\/li>\n\n\n\n<li>des dragages compl\u00e9mentaires sur certains d\u00e9p\u00f4ts cibl\u00e9s<\/li>\n<\/ul>\n\n\n\n<p>Ce sc\u00e9nario de gestion s\u00e9dimentaire mixte introduit des am\u00e9liorations notables par rapport aux chasses de Verbois men\u00e9es avant 2016&nbsp;: le respect par l\u2019exploitant suisse de seuils de taux de MES (Mati\u00e8res en Suspension) \u00e0 la fronti\u00e8re, identiques aux seuils fix\u00e9s \u00e0 Seyssel et des abaissements seulement partiels des retenues de Verbois et Chancy Pougny situ\u00e9e plus \u00e0 l\u2019aval.<\/p>\n\n\n\n<p>Le CPIE Bugey Genevois (Centre Permanent d&rsquo;Initiatives pour l&rsquo;Environnement) est charg\u00e9 par CNR de sensibiliser les habitants \u00e0 la gestion s\u00e9dimentaire du Haut Rh\u00f4ne lors de l\u2019abaissement partiel de la retenue de Verbois (APAVER). Venez les rencontrer \u00e0 Seyssel\u00a0 74 (Place Grenette), G\u00e9nissiat (Barrage) et Valserh\u00f4ne (passerelle de Coupy).\u00a0<\/p>\n\n\n\n<p><strong>VENDREDI 16 mai<\/strong> (17h-20h)\u00a0\u00e0 Valserh\u00f4ne et Seyssel<br><strong>SAMEDI 17 mai<\/strong> (9h-12h) \u00e0 Valserh\u00f4ne et G\u00e9nissiat<br><strong>SAMEDI 17 mai<\/strong> (14h-17h) \u00e0 G\u00e9nissiat et Valserh\u00f4ne<br><strong>VENDREDI 23 mai<\/strong> (17h-20h) \u00e0 Seyssel et Valserh\u00f4ne<br><strong>SAMEDI 24 mai<\/strong> (9h-12h) \u00e0 G\u00e9nissiat et Valserh\u00f4ne\u00a0<br><strong>SAMEDI 24 mai<\/strong> (14h-17h) \u00e0 Seyssel (base de Loisirs) et Valserh\u00f4ne<\/p>\n\n\n\n<p>Pour tout renseignement, merci de contacter le 04.50.59.00.61 ou par mail <a href=\"mailto:contact@cpie-bugeygenevois.fr\">contact@cpie-bugeygenevois.fr<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"849\" src=\"https:\/\/seyssel74.com\/wp-content\/uploads\/2025\/05\/Gestion-sedimentaire-Rhone-CNR-mai-2025.jpg\" alt=\"\" class=\"wp-image-20192\" srcset=\"https:\/\/seyssel74.com\/wp-content\/uploads\/2025\/05\/Gestion-sedimentaire-Rhone-CNR-mai-2025.jpg 600w, https:\/\/seyssel74.com\/wp-content\/uploads\/2025\/05\/Gestion-sedimentaire-Rhone-CNR-mai-2025-212x300.jpg 212w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Du 15 mai au 27 mai 2025,\u00a0le niveau du Rh\u00f4ne va fortement baisser. Savez-vous pourquoi\u00a0?Le Rh\u00f4ne, un fleuve am\u00e9nag\u00e9 pour produire de l&rsquo;\u00e9lectricit\u00e9 Du barrage de Ch\u00e8vres \u00e0 l\u2019aval de Gen\u00e8ve en 1896 jusqu\u2019\u00e0 l\u2019usine hydro\u00e9lectrique de Sault-Br\u00e9naz mise en eau en 1986 , le transit des mat\u00e9riaux entre Gen\u00e8ve et les embouchures du fleuve [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ofc_meta_disable_footer_callout":"","ofc_meta_callout_button_url":"","ofc_meta_callout_button_txt":"","ofc_meta_callout_text":"","ofc_enable_fullscreen":"disable","ofc_fullscreen_speed":0,"ofc_fullscreen_nav":"enable","ofc_fullscreen_nav_pos":"right","ofc_fullscreen_nav_color":"","ofc_fullscreen_nav_tooltip_color":"","ofc_fullscreen_responsive":0,"osp_disable_panel":"default","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[68,16],"tags":[69,17],"class_list":["post-20191","post","type-post","status-publish","format-standard","hentry","category-eau","category-environnement","tag-eau","tag-environnement","entry"],"_links":{"self":[{"href":"https:\/\/seyssel74.com\/index.php\/wp-json\/wp\/v2\/posts\/20191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seyssel74.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seyssel74.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seyssel74.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seyssel74.com\/index.php\/wp-json\/wp\/v2\/comments?post=20191"}],"version-history":[{"count":1,"href":"https:\/\/seyssel74.com\/index.php\/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