{"id":3863,"date":"2018-02-06T16:14:52","date_gmt":"2018-02-06T15:14:52","guid":{"rendered":"https:\/\/www.ern.org\/?page_id=3863"},"modified":"2025-06-16T16:49:30","modified_gmt":"2025-06-16T14:49:30","slug":"selune-libre","status":"publish","type":"page","link":"https:\/\/www.ern.org\/en\/selune-libre\/","title":{"rendered":"Selune libre"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1dv27l3-6739ab5b8f88f58a305d48fbb5c345e7\">\n.flex_column.av-1dv27l3-6739ab5b8f88f58a305d48fbb5c345e7{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-1dv27l3-6739ab5b8f88f58a305d48fbb5c345e7 av_two_third  avia-builder-el-0  el_before_av_one_third  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2ze1d3-984a65b29ade4a52faa062bc756c0821\">\n#top .av-special-heading.av-2ze1d3-984a65b29ade4a52faa062bc756c0821{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-2ze1d3-984a65b29ade4a52faa062bc756c0821 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-2ze1d3-984a65b29ade4a52faa062bc756c0821 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-2ze1d3-984a65b29ade4a52faa062bc756c0821 av-special-heading-h2 blockquote modern-quote  avia-builder-el-1  el_before_av_hr  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Removal of two large dams (Vezins et Roche qui boit) to free the S\u00e9lune River !<\/h2><div class='av-subheading av-subheading_below'><p>Removal of two dams on the coastal river S\u00e9lune, Normandy, France<\/p>\n<\/div><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1b07sb1-a55b061308f01d88b93b447e708d6175\">\n#top .hr.hr-invisible.av-1b07sb1-a55b061308f01d88b93b447e708d6175{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-1b07sb1-a55b061308f01d88b93b447e708d6175 hr-invisible  avia-builder-el-2  el_after_av_heading  el_before_av_image '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ld35i8co-91a827deed044cbaf6e7942ef001725f\">\n.avia-image-container.av-ld35i8co-91a827deed044cbaf6e7942ef001725f img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-ld35i8co-91a827deed044cbaf6e7942ef001725f .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-ld35i8co-91a827deed044cbaf6e7942ef001725f av-styling- avia-align-center  avia-builder-el-3  el_after_av_hr  el_before_av_textblock '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" class='wp-image-17661 avia-img-lazy-loading-not-17661 avia_image ' src=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/01\/photos_selune_bd.jpg\" alt='' title='photos_selune_bd'  height=\"181\" width=\"1000\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/01\/photos_selune_bd.jpg 1000w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/01\/photos_selune_bd-300x54.jpg 300w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/01\/photos_selune_bd-768x139.jpg 768w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/01\/photos_selune_bd-705x128.jpg 705w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-ld36az40-e82abe04db0bad5f191eae7ad85c6598 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Vezins dam under deconstruction \/ CR : DDTM 50\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 La-Roche-qui-Boit dam under deconstruction \/ CR: ERN, 2022<\/p>\n<\/div><\/section><br \/>\n<div  class='hr av-2i5jef-dc13474e264d6f2b2ddade0f8c3af11d hr-default  avia-builder-el-5  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-jox6ip4q-4c0c9e0ed44ef5234fe8fc114c381067 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong>Abstract of the project\u00a0<\/strong>(Updated May 17. 2024)<\/p>\n<p><strong><br \/>\n<\/strong>\u00a0The hydroelectric dams of La Roche-qui-boit and Vezins were built on the S\u00e9lune between 1916 and 1932. At 16m and 36m high they constitute an unsurmountable hinderance for migratory fish that frequent this coastal river. Given the impacts, the regulatory obligations made previously to bring them up to standard, water quality problems they generate, their low energy productivity and reports which conclude it is technically impossible to rearrange them, removal the dams at the end of the concession period back in 2007 was requested by NGOs and also the represantatives of SAGE. Local opposition has also been strong. \u00a0Summer 2019, the Vezins dam is being dismantled. The removal of the Roche-qui-boit dam began on 20 June 2022. The work was completed in spring 2023. Once the two large dams have been dismantled, almost 100 km of the river will be free for sediment and migratory fish. A major scientific monitoring programme has been accompanying this project since 2012 and will continue until 2027. The initial results of the post-dam removal monitoring carried out by INRAE are encouraging, with migratory fish (salmon, eel, lamprey) observed in the S\u00e9lune upstream of the former dams from the first year. A renaturation project to enhance and provide access to the S\u00e9lune valley is currently underway.<\/p>\n<p><em><a href=\"http:\/\/www.ern.org\/en\/selune-libre-archive\/\"><span class=\"tlid-translation translation\" lang=\"en\"><span title=\"\">All decisions and highlights connected with removal of the S\u00e9lune dams<\/span><\/span> <\/a><\/em><\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-47fwev-cd4032e60c67a9ddf362e226e99abc9e\">\n#top .hr.hr-invisible.av-47fwev-cd4032e60c67a9ddf362e226e99abc9e{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-47fwev-cd4032e60c67a9ddf362e226e99abc9e hr-invisible  avia-builder-el-7  el_after_av_textblock  el_before_av_buttonrow '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<div  class='avia-buttonrow-wrap av-l4zj8ga6-2143bbede26163483c0b3271bea28bac avia-buttonrow-center  avia-builder-el-8  el_after_av_hr  el_before_av_hr '>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-l4zj8dn8-d4fee4c5bd0bc1e7c774e204ad8834c9\">\n#top #wrap_all .avia-button.av-l4zj8dn8-d4fee4c5bd0bc1e7c774e204ad8834c9{\nmargin-bottom:25px;\nmargin-right:13px;\nmargin-left:13px;\n}\n<\/style>\n<a href='https:\/\/www.ern.org\/en\/selune-libre-vezins\/'  class='avia-button av-l4zj8dn8-d4fee4c5bd0bc1e7c774e204ad8834c9 avia-icon_select-no avia-size-medium avia-color-theme-color'  ><span class='avia_iconbox_title' >more about the Vezins dam removal<\/span><\/a>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-l4zj9swo-52ff1de64c167af97fe05aff44ecfae4\">\n#top #wrap_all .avia-button.av-l4zj9swo-52ff1de64c167af97fe05aff44ecfae4{\nmargin-bottom:25px;\nmargin-right:13px;\nmargin-left:13px;\n}\n<\/style>\n<a href='https:\/\/www.ern.org\/en\/selune-libre-la-roche-qui-boit\/'  class='avia-button av-l4zj9swo-52ff1de64c167af97fe05aff44ecfae4 avia-icon_select-no avia-size-medium avia-color-theme-color'  ><span class='avia_iconbox_title' >more on the La Roche-qui-boit dam removal<\/span><\/a>\n<\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1bry5wn-a63eb46c69cd5c840b65873693e89182\">\n#top .hr.hr-invisible.av-1bry5wn-a63eb46c69cd5c840b65873693e89182{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-1bry5wn-a63eb46c69cd5c840b65873693e89182 hr-invisible  avia-builder-el-9  el_after_av_buttonrow  el_before_av_video '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<div  class='avia-video av-m9jo9zhh-a89300f6097ce023c93c651d7fb1a7d6 avia-video-16-9 av-no-preview-image avia-video-load-always av-lazyload-immediate av-lazyload-video-embed'  itemprop=\"video\" itemtype=\"https:\/\/schema.org\/VideoObject\"  data-original_url='https:\/\/www.youtube.com\/watch?v=yMk9E41NtII'><script type='text\/html' class='av-video-tmpl'><div class='avia-iframe-wrap'><iframe loading=\"lazy\" title=\"France: The largest dam removal worldwide 2017-2022\" width=\"1500\" height=\"844\" src=\"https:\/\/www.youtube.com\/embed\/yMk9E41NtII?feature=oembed&autoplay=0&loop=0&controls=1&mute=0\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div><\/script><div class='av-click-to-play-overlay'><div class=\"avia_playpause_icon\"><\/div><\/div><\/div><br \/>\n<div  class='avia-button-wrap av-lie9l97f-acd2e82c2e17886bac7eb3c48622d94b-wrap avia-button-center  avia-builder-el-11  el_after_av_video  el_before_av_hr '><a href='https:\/\/vimeo.com\/546711100'  class='avia-button av-lie9l97f-acd2e82c2e17886bac7eb3c48622d94b avia-icon_select-no avia-size-x-large avia-position-center avia-color-green'  ><span class='avia_iconbox_title' >Watch ERNs Video Reportage on the Vezins &amp; la Roche-qui-Boit dam removal (2023)<\/span><\/a><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1b07sb1-4-0c69bb273e614940df42ce17edc39fe6\">\n#top .hr.hr-invisible.av-1b07sb1-4-0c69bb273e614940df42ce17edc39fe6{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-1b07sb1-4-0c69bb273e614940df42ce17edc39fe6 hr-invisible  avia-builder-el-12  el_after_av_button  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-13zb2hj-0451c79664736115cd3c4b20c3e5b9d1 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div class=\"oSioSc\">\n<div id=\"tw-target\">\n<div id=\"tw-target-text-container\" class=\"gsrt tw-ta-container tw-nfl\">\n<h3 id=\"tw-target-text\" class=\"tw-data-text tw-ta tw-text-small\" dir=\"ltr\" data-placeholder=\"Traduction\"><span lang=\"en\">A project backed by scientific and technical considerations\u00a0<\/span><\/h3>\n<p>As confirmed by the authority of res judicata and separate from the legal justification for\u00a0 removal, the Selune Valley renaturation project was necessary for both scientific and technical reasons. (<a href=\"http:\/\/www.ern.org\/en\/selune-libre-archive\/\">See the chronology of the removal<\/a>).<\/p>\n<p>The reservoirs of Vezins and La Roche-Qui-Boit generate extremely large bodies of water taking away the natural character of close to 25 km of the S\u00e9lune River.<\/p>\n<p>The Vezins lake is of poor ecological quality, while the S\u00e9lune river itself has been improving. This condition is further diminished by nutrient concentrations observed in the water, and the presence of chlorophyll which demonstrates eutrophication of the environment.<\/p>\n<p>Swimming has been prohibited making the use of the lakes for nautical and aquatic activities impossible. The trophic and ecological imbalance linked to the poor water quality has lead to the development of cyanobacteria. These cyanobacteria can secrete toxins, some of which are extremely dangerous.<span style=\"color: #ffffff;\">.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><span lang=\"en\">The Vezins reservoir causes <\/span>significant sedimentation (the volume of sediments is currently estimated at around 2 million m3) and the management of stored volumes is problematic. Inhabitants still have in mind the disastrous emptying which took place in 1993. For the current project, the complexity of the works and the associated cost is directly related to\u00a0 sedimentary management, demonstrating the difficulties posed by the blockage of a transit that would be natural if S\u00e9lune was a free flowing river.<\/p>\n<p>The reservoirs of Vezins and La Roche-Qui-Boit also hinder the natural process of self-purification which, if it could be freely exercised, contribute significantly to improved water quality.<\/p>\n<p>The blockage of sediment flow associated with dams also results in the disappearance of substrates favorable to the life and reproduction of aquatic species.<\/p>\n<h3 id=\"tw-target-text\" class=\"tw-data-text tw-ta tw-text-small\" dir=\"ltr\" data-placeholder=\"Traduction\"><span lang=\"en\">The removal of the dams is necessary to <\/span><\/h3>\n<ul>\n<li>Restore the hydrodynamic equilibrium of the Bay\u2019s ecosystem. Indeed, after removal, the river will have recovered its hydrological and biological function and will result in much improved quality of both water and sediments.<\/li>\n<li>Ensure the return to the S\u00e9e-S\u00e9lune complex of an abundant population of Atlantic salmon, a population that according to the work of INRA and ONEMA, has a particularly important genetic and heritage relevance for this region of the Atlantic.<\/li>\n<\/ul>\n<p>As of now, the potential of the S\u00e9lune Basin is estimated to be 5,000 Atlantic salmon. Of course, many migratory fish species will also benefit from this removal.<span style=\"color: #ffffff;\">.<\/span><\/p>\n<h3 class=\"tw-data-text tw-ta tw-text-small\" dir=\"ltr\" data-placeholder=\"Traduction\"><span lang=\"en\">Ecological discontinuity of the dams and ministerial decision of their removal<\/span><\/h3>\n<p>Considered to be the 3rd best French river in terms of \u201cSalmon potential\u201d, the S\u00e9lune is a classified river for Atlantic salmon, sea trout, brown trout, European eel, pike, sea lamprey and river lamprey. In general, the waterways of the S\u00e9lune basin have a significant ecological potential and therefore benefit from a set of protection or classification measures (<a href=\"http:\/\/www.ern.org\/en\/selune-libre-archive\/\">see chapter<\/a>\u00a0 : Protection and classification measures of S\u00e9lune)<\/p>\n<p>In addition to the adverse effects of these dams on the quality of the water in the reservoirs, their presence is a problem of ecological continuity, long since identified as the reason for associated protests.<\/p>\n<p>As early as 2005 the \u201cSAGE S\u00e9lune\u201d has been positioning for removal of these dams in order to restore the S\u00e9lune migratory axis. And in 2009, based on a report by EDF in 2007, and the lack of technical possibilities to rearrange the dams to ensure fish and sediment continuity, the State decided not to renew the administrative titles of the Vezins and Roche-Qui-Boit dams and to begin the dismantling process. After several advances and retreat by the State, the removal of the Vezins and La-Roche-qui-Boit dams was definitively decided in 2017. (<a href=\"https:\/\/www.ern.org\/en\/selune-libre-archive\/\">See the details of the steps that led to this decision).<\/a><\/p>\n<div class=\"col span_12 light left\">\n<div class=\"vc_col-sm-12 wpb_column column_container vc_column_container col no-extra-padding instance-3\" data-border-radius=\"none\" data-shadow=\"none\" data-border-animation=\"\" data-border-animation-delay=\"\" data-border-width=\"none\" data-border-style=\"\" data-border-color=\"\" data-bg-cover=\"\" data-padding-pos=\"all\" data-has-bg-color=\"false\" data-bg-color=\"\" data-bg-opacity=\"1\" data-hover-bg=\"\" data-hover-bg-opacity=\"1\" data-animation=\"\" data-delay=\"0\">\n<div class=\"vc_column-inner\">\n<div class=\"wpb_wrapper\">\n<div class=\"wpb_text_column wpb_content_element \">\n<div class=\"wpb_wrapper\">\n<h3 id=\"tw-target-text\" class=\"tw-data-text tw-ta tw-text-small\" dir=\"ltr\" data-placeholder=\"Traduction\"><span lang=\"en\"><strong>Operational follow-ups and studies undertaken <\/strong><\/span><\/h3>\n<p>Since 2009 and in order to give an operational follow-up to this decision, the Minister of State and the Secretary of State for Ecology have instructed the Prefect of the Departement la Manche to launch the operations required for the successful dismantling of the two dams and re-naturalization of the river.<\/p>\n<p>Considering the clear desire to implement this project in terms of the environment and sustainable development, the State has launched numerous studies aimed at detailing technical choices. By defining the parameters such as re-naturalization, sediment management, waste management associated with decommissioning, fish management, etc. with the goal of achieving a zero state of the river, essential elements on which to assess the biological benefits, the works will take into account the effect of the removal on local activities and especially the impact on tourism on the surrounding villages.<\/p>\n<p>The state has also been very concerned about the potential risks of the operation and has established:<\/p>\n<ul>\n<li>a flood risk study to analyze the current effect of the two dams on downstream flood flows.<\/li>\n<li>a study on the state of polluted sediments present on the site, including a characterization of the sediments and a site management plan<\/li>\n<li>a study of the release capacity of contaminants present in the sediments of the reservoirs<\/li>\n<\/ul>\n<p>Since 2012 a scientific program has been conducted to monitor the dam removal operation. It is organized around four interrelated themes: Landscapes, Inhabitants, Uses, Ripisylve, Landscape, and Agriculture, Fluvial Dynamics and Aquatic Biocenosis (Resp J.-L Baglini\u00e8re, Agrocampus Rennes). <a href=\"https:\/\/programme-selune.com\/programme-selune-eng\/welcome-to-the-selune-scientific-program-website\">(See the complete program in English<\/a><u>)<\/u><\/p>\n<p>As part of the socio-geographical component of this program, a team of geographers and sociologists (Resp.M.A. Germaine, University of Paris West) are working on the transformations affecting the landscapes but also the uses and representations of the valley. This work proposes an inventory of fixtures, a history and a follow-up of the landscapes and uses of the valley of S\u00e9lune. The results of their research are available at: <a href=\"http:\/\/selune.hypotheses.org\/\">http:\/\/selune.hypotheses.org\/ (Only available in French)<\/a>.<\/p>\n<\/div>\n<p>More info : SOISSONS, L., GERMAINE, M.-A., CHEV\u00c9, M., KREUTZENBERGER, K., BEAULATON, L., &amp; ROUSSEL, J.-M. (2025). <a href=\"https:\/\/doi.org\/10.20870\/Revue-SET.2025.47.8330\">Gen\u00e8se d\u2019un suivi scientifique \u00e0 long terme pour documenter les transitions \u00e9cologiques et territoriales accompagnant l\u2019effacement de grands barrages en France.<\/a>\u00a0<i>Sciences Eaux &amp; Territoires<\/i>, (47), article 8330.<\/p>\n<div class=\"wpb_wrapper\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/section><br \/>\n<div  class='hr av-qmktsn-ed1e064095989531fbee9a650939245a hr-default  avia-builder-el-14  el_after_av_textblock  el_before_av_button '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<div  class='avia-button-wrap av-7s4j3r-5f3e895054bcf49339c975a1ba16fbaf-wrap avia-button-center  avia-builder-el-15  el_after_av_hr  avia-builder-el-last '><a href='http:\/\/www.ern.org\/en\/selune-libre-archive\/'  class='avia-button av-7s4j3r-5f3e895054bcf49339c975a1ba16fbaf avia-icon_select-no avia-size-large avia-position-center avia-color-theme-color'  ><span class='avia_iconbox_title' >Toward a living S\u00e9lune, more infos<\/span><\/a><\/div><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3vcdef-f08ea506ce81fbdf272fe2c521415baf\">\n.flex_column.av-3vcdef-f08ea506ce81fbdf272fe2c521415baf{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-3vcdef-f08ea506ce81fbdf272fe2c521415baf av_one_third  avia-builder-el-16  el_after_av_two_third  el_before_av_hr  flex_column_div av-zero-column-padding  '     ><p><div  id=\"avia-magazine-1\"  class='av-magazine av-11f68mf-6015116876962ee894184f999142a8f9 av-magazine-top-bar-active  avia-builder-el-17  el_before_av_button  avia-builder-el-first   avia-builder-el-17  el_before_av_button  avia-builder-el-first ' ><div class='av-magazine-top-bar avia-font-color-black avia-inherit-font-color'><a href='#' class='av-magazine-top-heading ' >News<\/a><\/div><div class='av-magazine-group sort_all'><article class='av-magazine-entry av-magazine-entry-id-22454 av-magazine-format-standard av-magazine-type-post av-magazine-entry-1 av-magazine-entry-small '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class=\"av-magazine-thumbnail\"><a href='https:\/\/www.ern.org\/en\/25000-km-of-open-waterways\/' title='Link to: 25,000 km of open waterways?' class='av-magazine-thumbnail-link'><img decoding=\"async\" width=\"80\" height=\"80\" src=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-80x80.png\" class=\"wp-image-11149 avia-img-lazy-loading-not-11149 attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-80x80.png 80w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-36x36.png 36w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-180x180.png 180w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><\/a><\/div><div class=\"av-magazine-content-wrap\"><header class=\"entry-content-header\"><time class='av-magazine-time updated'  itemprop=\"datePublished\" datetime=\"2025-12-01T17:18:23+01:00\" >1 December 2025<\/time><h3 class='av-magazine-title entry-title '  itemprop=\"headline\" ><a href='https:\/\/www.ern.org\/en\/25000-km-of-open-waterways\/' title='Link to: 25,000 km of open waterways?'>25,000 km of open waterways?<\/a><\/h3><\/header><\/div><footer class=\"entry-footer\"><\/footer><\/article><article class='av-magazine-entry av-magazine-entry-id-22438 av-magazine-format-standard av-magazine-type-post av-magazine-entry-2 av-magazine-entry-small '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class=\"av-magazine-thumbnail\"><a href='https:\/\/www.ern.org\/en\/join-our-upcoming-webinars-about-free-flowing-rivers\/' title='Link to: Are there still rivers for migratory fish?' class='av-magazine-thumbnail-link'><img decoding=\"async\" width=\"80\" height=\"80\" src=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-80x80.png\" class=\"wp-image-11149 avia-img-lazy-loading-not-11149 attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-80x80.png 80w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-36x36.png 36w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2020\/01\/logo_soslv_ern-180x180.png 180w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><\/a><\/div><div class=\"av-magazine-content-wrap\"><header class=\"entry-content-header\"><time class='av-magazine-time updated'  itemprop=\"datePublished\" datetime=\"2025-12-01T17:17:39+01:00\" >1 December 2025<\/time><h3 class='av-magazine-title entry-title '  itemprop=\"headline\" ><a href='https:\/\/www.ern.org\/en\/join-our-upcoming-webinars-about-free-flowing-rivers\/' title='Link to: Are there still rivers for migratory fish?'>Are there still rivers for migratory fish?<\/a><\/h3><\/header><\/div><footer class=\"entry-footer\"><\/footer><\/article><article class='av-magazine-entry av-magazine-entry-id-22252 av-magazine-format-standard av-magazine-type-post av-magazine-entry-3 av-magazine-entry-small '  itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class=\"av-magazine-thumbnail\"><a href='https:\/\/www.ern.org\/en\/dam-removal-day-2-nouveaux-factsheets-pour-comprendre-les-effacements-de-barrages-et-seuils\/' title='Link to: Dam Removal Day: celebrate free flowing rivers:  2 new factsheets to understand dam and weir removals' class='av-magazine-thumbnail-link'><img decoding=\"async\" width=\"80\" height=\"80\" src=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/06\/3.20230516_164422-80x80.jpg\" class=\"wp-image-18424 avia-img-lazy-loading-not-18424 attachment-thumbnail size-thumbnail wp-post-image\" alt=\"\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/06\/3.20230516_164422-80x80.jpg 80w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/06\/3.20230516_164422-36x36.jpg 36w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2023\/06\/3.20230516_164422-180x180.jpg 180w\" sizes=\"(max-width: 80px) 100vw, 80px\" \/><\/a><\/div><div class=\"av-magazine-content-wrap\"><header class=\"entry-content-header\"><time class='av-magazine-time updated'  itemprop=\"datePublished\" datetime=\"2025-10-08T08:00:57+02:00\" >8 October 2025<\/time><h3 class='av-magazine-title entry-title '  itemprop=\"headline\" ><a href='https:\/\/www.ern.org\/en\/dam-removal-day-2-nouveaux-factsheets-pour-comprendre-les-effacements-de-barrages-et-seuils\/' title='Link to: Dam Removal Day: celebrate free flowing rivers:  2 new factsheets to understand dam and weir removals'>Dam Removal Day: celebrate free flowing rivers:  2 new factsheets to understand dam and weir removals<\/a><\/h3><\/header><\/div><footer class=\"entry-footer\"><\/footer><\/article><\/div><\/div><br \/>\n<div  class='avia-button-wrap av-koe7h2wp-3af0e2dcc0a040999c14d39a60148f14-wrap avia-button-center  avia-builder-el-18  el_after_av_magazine  el_before_av_hr '><a href='https:\/\/www.ern.org\/en\/selune-all-news\/'  class='avia-button av-koe7h2wp-3af0e2dcc0a040999c14d39a60148f14 avia-icon_select-no avia-size-small avia-position-center avia-color-theme-color'  ><span class='avia_iconbox_title' >More news<\/span><\/a><\/div><br \/>\n<div  class='hr av-ylqmaf-38348c68f6aa5b542e18e02ee00c0612 hr-default  avia-builder-el-19  el_after_av_button  el_before_av_button '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<div  class='avia-button-wrap av-syuy6v-636711240575838e4f276b5ffa08f34f-wrap avia-button-center  avia-builder-el-20  el_after_av_hr  el_before_av_button '><a href='https:\/\/ern-sosloirevivante.org\/wp-content\/uploads\/2025\/06\/Factsheet_Selune_ERN_mai2025.pdf'  class='avia-button av-syuy6v-636711240575838e4f276b5ffa08f34f avia-icon_select-no avia-size-medium avia-position-center avia-color-green'  ><span class='avia_iconbox_title' >Factsheet, may 2025, ERN<\/span><\/a><\/div><br \/>\n<div  class='avia-button-wrap av-2crkdj-72a11869d49b166c14761f44039bf111-wrap avia-button-center  avia-builder-el-21  el_after_av_button  el_before_av_button '><a href='https:\/\/www.ern.org\/en\/selune-docs-medias-videos-comm-presse\/'  class='avia-button av-2crkdj-72a11869d49b166c14761f44039bf111 avia-icon_select-no avia-size-medium avia-position-center avia-color-theme-color-highlight'  ><span class='avia_iconbox_title' >Docs and press release<\/span><\/a><\/div><br \/>\n<div  class='avia-button-wrap av-u9l1qv-12159be35af0eab8a370fda29d4399a0-wrap avia-button-center  avia-builder-el-22  el_after_av_button  el_before_av_button '><a href='http:\/\/www.ern.org\/en\/selune-libre-archive\/'  class='avia-button av-u9l1qv-12159be35af0eab8a370fda29d4399a0 avia-icon_select-no avia-size-medium avia-position-center avia-color-theme-color-highlight'  ><span class='avia_iconbox_title' >All decisions and highlights connected to the project<\/span><\/a><\/div><br \/>\n<div  class='avia-button-wrap av-lcuq7p2c-93d765f07ef2e6253cdb111a5be87e4e-wrap avia-button-center  avia-builder-el-23  el_after_av_button  el_before_av_hr '><a href='https:\/\/www.ern.org\/en\/colloque-international-selune\/'  class='avia-button av-lcuq7p2c-93d765f07ef2e6253cdb111a5be87e4e avia-icon_select-no avia-size-medium avia-position-center avia-color-green'  ><span class='avia_iconbox_title' >INTERNATIONAL SELUNE CONFERENCE 2019 - all presentations here<\/span><\/a><\/div><br \/>\n<div  class='hr av-qmktsn-2-7426d5a298b2c969aa078c7ac304e9e9 hr-default  avia-builder-el-24  el_after_av_button  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-q4h907-04baf8d6d8b01dfa82b342db5759e27c '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h4>Localization<\/h4>\n<div id=\"attachment_3577\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/01\/carte_selune.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3577\" class=\"wp-image-3577 size-medium\" src=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/01\/carte_selune-300x197.jpg\" alt=\"\" width=\"300\" height=\"197\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/01\/carte_selune-300x197.jpg 300w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/01\/carte_selune.jpg 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-3577\" class=\"wp-caption-text\">S\u00e9lune basin<\/p><\/div>\n<p>The S\u00e9lune is a coastal river which rises in Saint-Cyr-du-Bailleul in the department of Manche and which, after 91km flows into the bay of Mont Saint-Michel. The Roche-qui-Boit dam is 12km from the sea, which leaves another 70km of the S\u00e9lune river for migritory fish to deal with.<\/p>\n<p><span class=\"tlid-translation translation\" lang=\"en\"><span title=\"\">\u00a0<\/span><\/span><\/p>\n<\/div><\/section><br \/>\n<div  class='hr av-nke4vb-feae793ff4400538a7c5efe569becdb5 hr-default  avia-builder-el-26  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-n17z6v-c450a39aded3fa542fc81af1f7a6836a '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h4>The S\u00e9lune hydropower plants<\/h4>\n<p>By prefectural decree of August 1914 and a further decree of the 23<sup>rd<\/sup> of\u00a0 November 1927, the Soci\u00e9t\u00e9 des Forces Motrices de la S\u00e9lune (SFMS) was given authority to build and operate the La Roche-qui-Boit and Vezins dams for the production of hydroelectricity. The SFMS was nationalized in 1946, its assets then being transferred to \u00c9lectricit\u00e9 de France (EDF).<\/p>\n<div id=\"attachment_8861\" style=\"width: 1010px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8861\" class=\"wp-image-8861 size-full\" src=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2019\/07\/Vezins-dam-powerhous-destruction-starts-DSCF0201_m_copyright-Roberto-Epple-ERN.jpg\" alt=\"\" width=\"1000\" height=\"563\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2019\/07\/Vezins-dam-powerhous-destruction-starts-DSCF0201_m_copyright-Roberto-Epple-ERN.jpg 1000w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2019\/07\/Vezins-dam-powerhous-destruction-starts-DSCF0201_m_copyright-Roberto-Epple-ERN-300x169.jpg 300w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2019\/07\/Vezins-dam-powerhous-destruction-starts-DSCF0201_m_copyright-Roberto-Epple-ERN-768x432.jpg 768w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2019\/07\/Vezins-dam-powerhous-destruction-starts-DSCF0201_m_copyright-Roberto-Epple-ERN-705x397.jpg 705w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><p id=\"caption-attachment-8861\" class=\"wp-caption-text\">\u00a9 ERN France<\/p><\/div>\n<p><b>Vezins dam<br \/>\n<\/b><b> (built between 1929 et 1932)<\/b><\/p>\n<p>&#8211; 17 km from the sea<br \/>\n&#8211; Concession period : 75 years (untill 31\/12\/2007)<br \/>\n&#8211; Power : 12,6 MW<br \/>\n&#8211; Production : 20 GWh<br \/>\n&#8211; Height : 36 m\u00e8tres<br \/>\n&#8211; Width : 278 m\u00e8tres<br \/>\n&#8211; Volume of the reservoir : 19 millions m3<br \/>\n&#8211; Length : 19 km<br \/>\n&#8211; Surface : 151 ha<\/p>\n<p><b>La-Roche-qui-Boit dam<br \/>\n(built between 1916 et 1919)<\/b><\/p>\n<div id=\"attachment_682\" style=\"width: 310px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-682\" class=\"wp-image-682 size-medium\" src=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2016\/12\/barrage_rochequiboit_cc_ERNFrance-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2016\/12\/barrage_rochequiboit_cc_ERNFrance-300x200.jpg 300w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2016\/12\/barrage_rochequiboit_cc_ERNFrance-705x470.jpg 705w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2016\/12\/barrage_rochequiboit_cc_ERNFrance-450x300.jpg 450w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2016\/12\/barrage_rochequiboit_cc_ERNFrance.jpg 750w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><p id=\"caption-attachment-682\" class=\"wp-caption-text\">\u00a9 ERN France<\/p><\/div>\n<p>&#8211; <span id=\"ouHighlight__0_4TO0_6\">Located<\/span><span id=\"noHighlight_0.2637560800395822\"> <\/span><span id=\"ouHighlight__6_7TO8_10\">the<\/span><span id=\"noHighlight_0.6260222256548281\"> <\/span><span id=\"ouHighlight__9_12TO12_15\">most<\/span><span id=\"noHighlight_0.7623241387207265\"> <\/span><span id=\"ouHighlight__18_21TO17_26\">downstream, <\/span>12 km from the sea<b><br \/>\n<\/b>&#8211; Power : 1,6MW<br \/>\n&#8211; Production : 4,7 GWh<br \/>\n&#8211; Height : 16 m\u00e8tres<br \/>\n&#8211; Width : 129 m\u00e8tres<br \/>\n&#8211; Volume of the reservoir : 1,4 millions m3<br \/>\n&#8211; Length : 4 km<br \/>\n&#8211; Surface : 40 ha<\/p>\n<p><span class=\"tlid-translation translation\" lang=\"en\"><span title=\"\">The production of these two EDF dams remains overall marginal. Indeed the needs of the Manche department are estimated at just over 2 billion kWh per year.<\/span><\/span><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-js22t9-f2fabac1def5e190a8a44bff6afd8b42 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3>Video produced by EDF, Onema, Seine Normandy Water Agency (english subtittle)<\/h3>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-hm1887-0ea11bcfe39cd1fa0c72d4e5392f89d0 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/vimeo.com\/97519786\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-3867 size-large\" src=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune-1030x580.jpg\" alt=\"\" width=\"1030\" height=\"580\" srcset=\"https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune-1030x580.jpg 1030w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune-300x169.jpg 300w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune-768x433.jpg 768w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune-705x397.jpg 705w, https:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/02\/video_selune.jpg 1136w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><\/p>\n<\/div><\/section><\/p><\/div><div  class='hr av-5g8c93-f3fb4ba2ee6d480c504f981db552876b hr-default  avia-builder-el-30  el_after_av_one_third  el_before_av_one_full '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-4hqhgn-9a5abc969b538d26c6fa3ad1baae2047\">\n.flex_column.av-4hqhgn-9a5abc969b538d26c6fa3ad1baae2047{\n-webkit-border-radius:0px 0px 0px 0px;\n-moz-border-radius:0px 0px 0px 0px;\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-4hqhgn-9a5abc969b538d26c6fa3ad1baae2047 av_one_full  avia-builder-el-31  el_after_av_hr  avia-builder-el-last  first flex_column_div av-zero-column-padding  '     ><section  class='av_textblock_section av-2hvogn-342a9265f31c868c290b0e49db4e4348 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Our activities on Selune dams are supported by <a href=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/03\/Logo_Patagonia_black.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4149\" src=\"http:\/\/www.ern.org\/wp-content\/uploads\/sites\/52\/2018\/03\/Logo_Patagonia_black-300x57.jpg\" alt=\"\" width=\"100\" height=\"19\" \/><\/a><\/p>\n<\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":151,"featured_media":7803,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-3863","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/pages\/3863","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/users\/151"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/comments?post=3863"}],"version-history":[{"count":0,"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/pages\/3863\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/media\/7803"}],"wp:attachment":[{"href":"https:\/\/www.ern.org\/en\/wp-json\/wp\/v2\/media?parent=3863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}