{"id":4978,"date":"2024-10-24T14:22:00","date_gmt":"2024-10-24T12:22:00","guid":{"rendered":"https:\/\/www.optimum-te-recette.horizon-ci.fr\/unclassified\/hdd-in-calais-france-there-is-always-a-solution\/"},"modified":"2025-06-16T11:10:59","modified_gmt":"2025-06-16T09:10:59","slug":"hdd-in-calais-france-there-is-always-a-solution","status":"publish","type":"post","link":"https:\/\/www.optimum-te.com\/en\/water-en\/hdd-in-calais-france-there-is-always-a-solution\/","title":{"rendered":"HDD in Calais, France: there is ALWAYS a solution !"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<p><strong>Local authority Communaut\u00e9 d\u2019Agglom\u00e9ration Grand Calais Terres &amp; Mers is at last able to complete the missing link in the renewal of its wastewater network. The project had been on hold for several years until OPTIMUM were contacted to find a solution.<\/strong><\/p>\n<p>The issue was how to cross the Calais \u2013 Dunkerque railway line given the high water table and the unstable sandy geology of the site. A classic gravity-flow tunnel would have needed a temporary lowering of the water table, which is not a viable solution under the railway. OPTIMUM engineers rethought the project, designing a 54-metre-long DN 200 HDD, 5 metres under the railway lines, with a pumping station at the exit point. They also filed a new SNCF dossier and handled negotiations to ensure all concerns were addressed and authorisations obtained.<\/p>\n<p>OPTIMUM then supervised the drilling operations, successfully carried out on Monday night by Coquart. The water board can now complete its upgrading.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Local authority Communaut\u00e9 d\u2019Agglom\u00e9ration Grand Calais Terres &#038; Mers is at last able to complete the missing link in the renewal of its wastewater network. The project had been on hold for several years until OPTIMUM were contacted to find a solution.<\/p>\n","protected":false},"author":1,"featured_media":3381,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"footnotes":""},"categories":[46],"tags":[80],"class_list":["post-4978","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-water-en","tag-hdd-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HDD in Calais, France: there is ALWAYS a solution ! - Optimum<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.optimum-te.com\/en\/water-en\/hdd-in-calais-france-there-is-always-a-solution\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HDD in Calais, France: there is ALWAYS a solution ! - Optimum\" \/>\n<meta property=\"og:description\" content=\"Local authority Communaut\u00e9 d\u2019Agglom\u00e9ration Grand Calais Terres &amp; Mers is at last able to complete the missing link in the renewal of its wastewater network. 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