{"id":4726,"date":"2025-11-04T10:19:16","date_gmt":"2025-11-04T10:19:16","guid":{"rendered":"https:\/\/eurohinca.com\/?p=4726"},"modified":"2026-05-13T10:37:41","modified_gmt":"2026-05-13T10:37:41","slug":"how-to-plan-a-subsea-outfall-from-land","status":"publish","type":"post","link":"https:\/\/eurohinca.com\/en\/como-planificar-un-emisario-submarino-desde-tierra\/","title":{"rendered":"How to plan a submarine outfall from land: bathymetry, environmental window and offshore reception?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"4726\" class=\"elementor elementor-4726\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d6327ef e-flex e-con-boxed e-con e-parent\" data-id=\"d6327ef\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d3dfe2 elementor-widget elementor-widget-text-editor\" data-id=\"0d3dfe2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-start=\"112\" data-end=\"739\">An emissary executed from land combines <strong data-start=\"171\" data-end=\"197\">microtunnel\/Direct Pipe<\/strong> to the coastline and the <strong data-start=\"227\" data-end=\"251\">reception <em data-start=\"239\" data-end=\"249\">offshore<\/em><\/strong> by barge or platform. Success depends on a <strong data-start=\"307\" data-end=\"336\">bathymetry and oceanography<\/strong> reliable, from a <strong data-start=\"353\" data-end=\"374\">environmental window<\/strong> (tides, waves, turbidity, fauna) and of a realistic (tides, swell, turbidity, fauna) and <strong data-start=\"427\" data-end=\"451\">controlled reception<\/strong> (cofferdam\/box, <em data-start=\"470\" data-end=\"489\">pull-back\/pull-in<\/em> and ROV verification). For the land and underwater section, please consult our services of <strong data-start=\"580\" data-end=\"654\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/submarine-emissaries\/\" target=\"_new\" rel=\"noopener\" data-start=\"582\" data-end=\"652\">Subsea outfalls<\/a><\/strong> y <strong data-start=\"657\" data-end=\"738\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/pipe-jacking-2\/\" target=\"_new\" rel=\"noopener\" data-start=\"659\" data-end=\"736\">Pipe jacking (microtunneling)<\/a><\/strong>.<\/p><h2 data-start=\"746\" data-end=\"812\">1) Bathymetry and oceanographic conditions (starting point)<\/h2><ul data-start=\"813\" data-end=\"1240\"><li data-start=\"813\" data-end=\"942\"><p data-start=\"815\" data-end=\"942\"><strong data-start=\"815\" data-end=\"843\">Integrated survey:<\/strong> multibeam, beach profiles and <strong data-start=\"874\" data-end=\"892\">coast line<\/strong>, more <strong data-start=\"898\" data-end=\"939\">currents, tides, waves and turbidity<\/strong>.<\/p><\/li><li data-start=\"943\" data-end=\"1100\"><p data-start=\"945\" data-end=\"1100\"><strong data-start=\"945\" data-end=\"979\">Maritime operation models:<\/strong> operating wave heights, <em data-start=\"1006\" data-end=\"1023\">weather windows<\/em> per station, return periods for lifting\/mooring and turbidity limits.<\/p><\/li><li data-start=\"1101\" data-end=\"1240\"><p data-start=\"1103\" data-end=\"1240\"><strong data-start=\"1103\" data-end=\"1134\">Interactions with the background:<\/strong> mobile sediments, risks of <strong data-start=\"1166\" data-end=\"1180\">undermining<\/strong> and protection of the diffuser (furling, ballasts, etc.), <em data-start=\"1226\" data-end=\"1238\">mattresses<\/em>).<\/p><\/li><\/ul><p data-start=\"1242\" data-end=\"1406\"><strong data-start=\"1242\" data-end=\"1271\">Initial design keys:<\/strong> position of the <strong data-start=\"1285\" data-end=\"1303\">attack shaft<\/strong> (sheltered from waves), trajectory under the beach, final elevation on the bed and lengths of <strong data-start=\"1392\" data-end=\"1405\">pull-back<\/strong>.<\/p><h2 data-start=\"1413\" data-end=\"1449\">2) Environmental window and permits<\/h2><ul data-start=\"1450\" data-end=\"1835\"><li data-start=\"1450\" data-end=\"1580\"><p data-start=\"1452\" data-end=\"1580\"><strong data-start=\"1452\" data-end=\"1482\">Environmental restrictions:<\/strong> periods of <strong data-start=\"1495\" data-end=\"1512\">wildlife closure<\/strong>, limits, limits of <strong data-start=\"1525\" data-end=\"1537\">turbidity<\/strong>, port traffic and protected areas.<\/p><\/li><li data-start=\"1581\" data-end=\"1711\"><p data-start=\"1583\" data-end=\"1711\"><strong data-start=\"1583\" data-end=\"1606\">Mitigation plan:<\/strong> turbidity curtains, plume tracking, shutdown protocols (<em data-start=\"1673\" data-end=\"1685\">stop rules<\/em>), environmental monitoring.<\/p><\/li><li data-start=\"1712\" data-end=\"1835\"><p data-start=\"1714\" data-end=\"1835\"><strong data-start=\"1714\" data-end=\"1747\">Coordination with authorities:<\/strong> captaincy\/port, environment, coast and municipalities (occupation of public domain).<\/p><\/li><\/ul><h2 data-start=\"1842\" data-end=\"1894\">3) Engineering of the layout and construction method.<\/h2><ul data-start=\"1895\" data-end=\"2445\"><li data-start=\"1895\" data-end=\"2173\"><p data-start=\"1897\" data-end=\"1937\"><strong data-start=\"1897\" data-end=\"1935\">Selection of the method from the ground:<\/strong><\/p><ul data-start=\"1940\" data-end=\"2173\"><li data-start=\"1940\" data-end=\"2059\"><p data-start=\"1942\" data-end=\"2059\"><strong data-start=\"1942\" data-end=\"1956\">Microtunnel<\/strong> (EPB\/hydroshield) if required <strong data-start=\"1987\" data-end=\"2005\">elevation\/slope<\/strong> precise, saturated soils and minimal footprint on the beach.<\/p><\/li><li data-start=\"2062\" data-end=\"2173\"><p data-start=\"2064\" data-end=\"2173\"><strong data-start=\"2064\" data-end=\"2079\">Direct Pipe<\/strong> for short\/medium crossings under watercourses\/beach with <strong data-start=\"2128\" data-end=\"2147\">continuous thrust<\/strong> and high watertightness.<\/p><\/li><\/ul><\/li><li data-start=\"2174\" data-end=\"2320\"><p data-start=\"2176\" data-end=\"2320\"><strong data-start=\"2176\" data-end=\"2202\">Recommended geometry:<\/strong> straight stretch under the beach, <strong data-start=\"2227\" data-end=\"2241\">Soft Rmin<\/strong>, sufficient coverage; reception in <strong data-start=\"2280\" data-end=\"2299\">drawer\/cofferdam<\/strong> or protected ditch.<\/p><\/li><li data-start=\"2321\" data-end=\"2445\"><p data-start=\"2323\" data-end=\"2445\"><strong data-start=\"2323\" data-end=\"2361\">Compatibility with marine piping:<\/strong> materials, <strong data-start=\"2374\" data-end=\"2380\">DN<\/strong>, and coatings, linings, collars and <strong data-start=\"2411\" data-end=\"2424\">diffusers<\/strong> (nozzles\/trees).<\/p><\/li><\/ul><h2 data-start=\"2452\" data-end=\"2503\">4) Reception <em data-start=\"2470\" data-end=\"2480\">offshore<\/em> (secure and verifiable)<\/h2><ul data-start=\"2504\" data-end=\"2894\"><li data-start=\"2504\" data-end=\"2618\"><p data-start=\"2506\" data-end=\"2618\"><strong data-start=\"2506\" data-end=\"2536\">Reception devices:<\/strong> <strong data-start=\"2537\" data-end=\"2550\">cofferdam<\/strong> prefabricated, open box, or <strong data-start=\"2582\" data-end=\"2591\">ditch<\/strong> with temporary protection.<\/p><\/li><li data-start=\"2619\" data-end=\"2758\"><p data-start=\"2621\" data-end=\"2758\"><strong data-start=\"2621\" data-end=\"2644\">Maritime operation:<\/strong> <em data-start=\"2645\" data-end=\"2668\"><strong data-start=\"2646\" data-end=\"2667\">pull-in\/pull-back<\/strong><\/em> with guide, mooring\/mooring equipment, tension control and barge-to-shore communication.<\/p><\/li><li data-start=\"2759\" data-end=\"2894\"><p data-start=\"2761\" data-end=\"2894\"><strong data-start=\"2761\" data-end=\"2778\">Verification:<\/strong> <strong data-start=\"2779\" data-end=\"2792\">ROV\/sonar<\/strong> to check outlet, mouth height and alignment; tightness tests and <strong data-start=\"2869\" data-end=\"2881\">as-built<\/strong> bathymetry.<\/p><\/li><\/ul><h2 data-start=\"2901\" data-end=\"2939\">5) Quick planning matrix<\/h2><div class=\"_tableContainer_1rjym_1\"><div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2941\" data-end=\"3553\"><thead data-start=\"2941\" data-end=\"2986\"><tr data-start=\"2941\" data-end=\"2986\"><th data-start=\"2941\" data-end=\"2948\" data-col-size=\"sm\">Phase<\/th><th data-start=\"2948\" data-end=\"2967\" data-col-size=\"sm\">Key decisions<\/th><th data-start=\"2967\" data-end=\"2986\" data-col-size=\"sm\">Minimum outputs<\/th><\/tr><\/thead><tbody data-start=\"3001\" data-end=\"3553\"><tr data-start=\"3001\" data-end=\"3102\"><td data-start=\"3001\" data-end=\"3020\" data-col-size=\"sm\">Previous studies<\/td><td data-start=\"3020\" data-end=\"3063\" data-col-size=\"sm\">Bathymetry, currents, swell, turbidity<\/td><td data-start=\"3063\" data-end=\"3102\" data-col-size=\"sm\">Operating model, <em data-start=\"3083\" data-end=\"3100\">weather windows<\/em><\/td><\/tr><tr data-start=\"3103\" data-end=\"3196\"><td data-start=\"3103\" data-end=\"3113\" data-col-size=\"sm\">Layout<\/td><td data-start=\"3113\" data-end=\"3154\" data-col-size=\"sm\">Well, elevation and length below beach, Rmin<\/td><td data-start=\"3154\" data-end=\"3196\" data-col-size=\"sm\">Approved longitudinal profile and plan<\/td><\/tr><tr data-start=\"3197\" data-end=\"3276\"><td data-start=\"3197\" data-end=\"3206\" data-col-size=\"sm\">Method<\/td><td data-start=\"3206\" data-end=\"3234\" data-col-size=\"sm\">Microtunnel vs Direct Pipe<\/td><td data-start=\"3234\" data-end=\"3276\" data-col-size=\"sm\">Curve of pressures, thrust, logistics<\/td><\/tr><tr data-start=\"3277\" data-end=\"3373\"><td data-start=\"3277\" data-end=\"3300\" data-col-size=\"sm\">Reception <em data-start=\"3289\" data-end=\"3299\">offshore<\/em><\/td><td data-start=\"3300\" data-end=\"3336\" data-col-size=\"sm\">Cofferdam\/trench, barge, moorings<\/td><td data-start=\"3336\" data-end=\"3373\" data-col-size=\"sm\">Anchoring, hoisting and safety plan<\/td><\/tr><tr data-start=\"3374\" data-end=\"3468\"><td data-start=\"3374\" data-end=\"3391\" data-col-size=\"sm\">Environment<\/td><td data-start=\"3391\" data-end=\"3431\" data-col-size=\"sm\">Turbidity limit, closures, monitoring<\/td><td data-start=\"3431\" data-end=\"3468\" data-col-size=\"sm\">Mitigation plan + <em data-start=\"3454\" data-end=\"3466\">stop rules<\/em><\/td><\/tr><tr data-start=\"3469\" data-end=\"3553\"><td data-start=\"3469\" data-end=\"3477\" data-col-size=\"sm\">QA\/QC<\/td><td data-start=\"3477\" data-end=\"3512\" data-col-size=\"sm\">Tolerances, tests, <em data-start=\"3501\" data-end=\"3511\">as-built<\/em><\/td><td data-start=\"3512\" data-end=\"3553\" data-col-size=\"sm\">Quality dossier and final bathymetry<\/td><\/tr><\/tbody><\/table><\/div><\/div><h2 data-start=\"3560\" data-end=\"3599\">6) Three representative scenarios<\/h2><ol data-start=\"3600\" data-end=\"4095\"><li data-start=\"3600\" data-end=\"3782\"><p data-start=\"3603\" data-end=\"3782\"><strong data-start=\"3603\" data-end=\"3645\">Exposed beach, fine sands, high NF:<\/strong> hydro-shielded microtunnel, well outside the surge zone, reception in <strong data-start=\"3713\" data-end=\"3726\">cofferdam<\/strong>; low energy sea windows for lifting and closing.<\/p><\/li><li data-start=\"3783\" data-end=\"3926\"><p data-start=\"3786\" data-end=\"3926\"><strong data-start=\"3786\" data-end=\"3821\">Sheltered bay, clean gravels:<\/strong> Direct Pipe with controlled bed and <strong data-start=\"3856\" data-end=\"3869\">pull-back<\/strong> to barge; protection of the diffuser with light furling.<\/p><\/li><li data-start=\"3927\" data-end=\"4095\"><p data-start=\"3930\" data-end=\"4095\"><strong data-start=\"3930\" data-end=\"3966\">Port area, heavy traffic:<\/strong> EPB microtunnel, coordination with captaincy and <strong data-start=\"4012\" data-end=\"4038\">short night window<\/strong>; verification <strong data-start=\"4053\" data-end=\"4060\">ROV<\/strong> and progressive opening of the diffuser.<\/p><\/li><\/ol><h2 data-start=\"4102\" data-end=\"4133\">7) Control and documentation<\/h2><ul data-start=\"4134\" data-end=\"4384\"><li data-start=\"4134\" data-end=\"4265\"><p data-start=\"4136\" data-end=\"4265\"><strong data-start=\"4136\" data-end=\"4159\">On-site parameters:<\/strong> front pressures, thrust\/torque, earth balance, <strong data-start=\"4217\" data-end=\"4244\">real-time turbidity<\/strong>, and topography\/ROV.<\/p><\/li><li data-start=\"4266\" data-end=\"4384\"><p data-start=\"4268\" data-end=\"4384\"><strong data-start=\"4268\" data-end=\"4284\">Deliverables:<\/strong> <em data-start=\"4285\" data-end=\"4295\">as-built<\/em> terrestrial and <strong data-start=\"4308\" data-end=\"4331\">posthole bathymetry<\/strong>, The company's products have been tested for leak tightness and environmental certificates.<\/p><\/li><\/ul><h2 data-start=\"4391\" data-end=\"4436\">8) What to send for a closed plan (RFQ)<\/h2><ul data-start=\"4437\" data-end=\"4705\"><li data-start=\"4437\" data-end=\"4546\"><p data-start=\"4439\" data-end=\"4546\"><strong data-start=\"4439\" data-end=\"4453\">Bathymetry<\/strong> y <strong data-start=\"4456\" data-end=\"4475\">metocean model<\/strong> (waves\/currents\/tides), <strong data-start=\"4504\" data-end=\"4512\">DN\/L<\/strong>, profile and <strong data-start=\"4523\" data-end=\"4534\">diffuser<\/strong> expected.<\/p><\/li><li data-start=\"4547\" data-end=\"4632\"><p data-start=\"4549\" data-end=\"4632\"><strong data-start=\"4549\" data-end=\"4562\">Geotechnics<\/strong> onshore (boreholes, permeability, NF) and environmental conditions.<\/p><\/li><li data-start=\"4633\" data-end=\"4705\"><p data-start=\"4635\" data-end=\"4705\">Permit requirements, navigation and <strong data-start=\"4672\" data-end=\"4695\">operating windows<\/strong> objective.<\/p><\/li><\/ul><p data-start=\"4707\" data-end=\"5096\">If you want us to specify the <strong data-start=\"4737\" data-end=\"4769\">reception plan <em data-start=\"4757\" data-end=\"4767\">offshore<\/em><\/strong> and the operating curve from the ground, our team of <strong data-start=\"4826\" data-end=\"4922\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/technical-assistance-and-engineering\/\" target=\"_new\" rel=\"noopener\" data-start=\"4828\" data-end=\"4920\">Technical assistance and engineering<\/a><\/strong> can prepare it with your soundings, bathymetry and <em data-start=\"4970\" data-end=\"4987\">weather windows<\/em>; to start, <strong data-start=\"5003\" data-end=\"5068\"><a class=\"decorated-link\" href=\"https:\/\/eurohinca.com\/en\/request-offer\/\" target=\"_new\" rel=\"noopener\" data-start=\"5005\" data-end=\"5066\">request offer<\/a><\/strong> attaching this information.<\/p><p data-start=\"5098\" data-end=\"5368\"><strong data-start=\"5098\" data-end=\"5135\">To broaden practical criteria:<\/strong> it is useful to contrast with the <a href=\"https:\/\/www.pianc.org\/publication\/dredging-management-practices-for-the-environment-a-structured-selection-approach\/\"><strong data-start=\"5168\" data-end=\"5186\">PIANC guides<\/strong><\/a> for maritime operations and with the <a href=\"https:\/\/unece.org\/fileadmin\/DAM\/env\/water\/meetings\/TFIR\/background%20documents\/UNEP%20guidelines%20sewage%20treatment.pdf\"><strong data-start=\"5224\" data-end=\"5248\">UNEP\/MAP Guidelines<\/strong><\/a> on outfall design and environmental control, addressing working windows, turbidity and seabed protection.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Un emisario ejecutado desde tierra combina microt\u00fanel\/Direct Pipe hasta la l\u00ednea de costa y la recepci\u00f3n offshore mediante barcaza o plataforma. El \u00e9xito depende de una batimetr\u00eda y oceanograf\u00eda fiables, de una ventana ambiental realista (mareas, oleaje, turbidez, fauna) y de una recepci\u00f3n controlada (cofferdam\/caj\u00f3n, pull-back\/pull-in y verificaci\u00f3n ROV). Para el tramo terrestre y bajo [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[146],"tags":[],"class_list":["post-4726","post","type-post","status-publish","format-standard","hentry","category-preguntas-frecuentes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Planificar un emisario submarino: claves t\u00e9cnicas<\/title>\n<meta name=\"description\" content=\"Gu\u00eda para planificar un emisario submarino desde tierra: viabilidad, geotecnia, trazado, permisos, microt\u00fanel y control de riesgos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/eurohinca.com\/en\/how-to-plan-a-subsea-outfall-from-land\/\" \/>\n<meta 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