{"id":8345,"date":"2025-11-05T09:40:02","date_gmt":"2025-11-05T07:40:02","guid":{"rendered":"https:\/\/www.nidaplast.com\/realisations\/un-bassin-de-retention-sous-lentree-dun-supermarche-lidl\/"},"modified":"2026-06-30T15:11:50","modified_gmt":"2026-06-30T13:11:50","slug":"un-bassin-de-retention-sous-entree-supermarche-lidl","status":"publish","type":"realisations","link":"https:\/\/www.nidaplast.com\/en\/case-studies\/stormwater-retention-basin-under-a-lidl-entrance\/","title":{"rendered":"An underground attenuation tank beneath a supermarket entrance"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"8345\" class=\"elementor elementor-8345 elementor-5005\" data-elementor-post-type=\"realisations\">\n\t\t\t\t<div class=\"elementor-element elementor-element-64e348b2 e-flex e-con-boxed e-con e-parent\" data-id=\"64e348b2\" 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-76aa36af elementor-widget elementor-widget-heading\" data-id=\"76aa36af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Sustainable stormwater management in an urban environment<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ff5d57a elementor-widget elementor-widget-text-editor\" data-id=\"3ff5d57a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Discover how Nidaplast EP modules made it possible to build a high-performance underground retention basin for the new LIDL store in Vieux-Cond\u00e9 (North of France).<br \/>An efficient solution for managing stormwater while meeting spatial constraints and maintaining traffic flow in a dense urban setting.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d221d77 e-con-full e-grid e-con e-child\" data-id=\"4d221d77\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1d3c4215 e-con-full e-flex e-con e-child\" data-id=\"1d3c4215\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3101788b elementor-widget elementor-widget-heading\" data-id=\"3101788b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">2022<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-256c6d84 elementor-widget elementor-widget-heading\" data-id=\"256c6d84\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">year of completion<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8298efe e-con-full e-flex e-con e-child\" data-id=\"8298efe\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-73bf0357 elementor-widget elementor-widget-heading\" data-id=\"73bf0357\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">300 m3<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b9ba458 elementor-widget elementor-widget-heading\" data-id=\"2b9ba458\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">storage capacity<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-792b339e e-con-full e-flex e-con e-child\" data-id=\"792b339e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2e63e6ae elementor-widget elementor-widget-heading\" data-id=\"2e63e6ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">300 kPa<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51aebe2 elementor-widget elementor-widget-heading\" data-id=\"51aebe2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">compressive strength<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-290a957b elementor-widget elementor-widget-heading\" data-id=\"290a957b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Project Context and Challenges<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-10396b1 e-con-full e-flex e-con e-child\" data-id=\"10396b1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7aa366e2 elementor-widget elementor-widget-heading\" data-id=\"7aa366e2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Reducing runoff and avoiding overload of the stormwater network<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7aa31bf7 elementor-widget elementor-widget-text-editor\" data-id=\"7aa31bf7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>With increasing urbanisation and decreasing permeable surfaces, an underground retention basin was necessary to collect stormwater runoff from the car park and the LIDL roof.<\/p><p><span style=\"text-decoration: underline;\">Identified constraints:<\/span><\/p><ul><li>Restricted working area close to a road<\/li><li>Short construction schedule before the store opening<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-32633f2a e-con-full e-flex e-con e-child\" data-id=\"32633f2a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-15ed0af elementor-widget elementor-widget-heading\" data-id=\"15ed0af\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Objectives Defined by the Project Owner<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7e5d75ed elementor-widget elementor-widget-text-editor\" data-id=\"7e5d75ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>The specifications required the installation of a fully underground retention basin ensuring:<\/p><ul><li>temporary stormwater storage,<\/li><li>controlled discharge to the sewer network,<\/li><li>a durable solution compliant with French ALUR requirements. (Note: Adapt accordingly for international audiences.)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1cd226f6 e-con-full e-flex e-con e-child\" data-id=\"1cd226f6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5e19c452 elementor-widget elementor-widget-heading\" data-id=\"5e19c452\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Solution Implemented with Nidaplast<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-72212cc8 elementor-widget elementor-widget-heading\" data-id=\"72212cc8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Nidaplast EP modules \u2013 honeycomb structures for water storage<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-192212ad elementor-widget elementor-widget-text-editor\" data-id=\"192212ad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Nidaplast EP modules were selected for their hydraulic performance, high mechanical strength and ease of installation.<\/p><p><span style=\"text-decoration: underline;\">Advantages in this context:<\/span><\/p><ul><li>95% useful void volume \u2192 maximum storage in limited space<\/li><li>Lightweight &amp; easy to handle \u2192 fast installation without heavy machinery<\/li><li>Recyclable product manufactured in France<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a799e89 e-con-full e-flex e-con e-child\" data-id=\"7a799e89\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-7a9cf2bd e-con-full e-flex e-con e-child\" data-id=\"7a9cf2bd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4da2f656 elementor-widget elementor-widget-image\" data-id=\"4da2f656\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"472\" height=\"364\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/PHOTO-BASSIN-NIDAPLAST-EP-2.jpg\" class=\"attachment-large size-large wp-image-5843\" alt=\"\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/PHOTO-BASSIN-NIDAPLAST-EP-2.jpg 472w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/PHOTO-BASSIN-NIDAPLAST-EP-2-300x231.jpg 300w\" sizes=\"(max-width: 472px) 100vw, 472px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3b59063b e-con-full e-flex e-con e-child\" data-id=\"3b59063b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4fede4cf elementor-widget elementor-widget-heading\" data-id=\"4fede4cf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Technical Characteristics of the Installed Product<\/h3>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4e293b2 e-con-full e-flex e-con e-child\" data-id=\"4e293b2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-14fa0f9e elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"14fa0f9e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Module dimensions:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-205356c1 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"205356c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">2400 x 1200 mm.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1ebb4100 e-con-full e-flex e-con e-child\" data-id=\"1ebb4100\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25212037 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"25212037\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Module thickness:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-586baa90 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"586baa90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">520 mm.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5b3039fb e-con-full e-flex e-con e-child\" data-id=\"5b3039fb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6a192c02 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"6a192c02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Storage capacity:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-502dd7fc elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"502dd7fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">\u2265 95\u202f%.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2fac3237 e-con-full e-flex e-con e-child\" data-id=\"2fac3237\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-381a4aa8 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"381a4aa8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Material:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7c9205f6 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"7c9205f6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Polypropylene (60% recycled \u2013 100% recyclable)<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aa260aa e-con-full e-flex e-con e-child\" data-id=\"aa260aa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-896c32d elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"896c32d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Weight per block:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5c97f2f elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"5c97f2f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">53 kg<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b32c108 e-con-full e-flex e-con e-child\" data-id=\"b32c108\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c1a004 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"3c1a004\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Maximum allowable cover height:<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3592477 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"3592477\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">2,3 m<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-faebfcc elementor-widget elementor-widget-shortcode\" data-id=\"faebfcc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><div class=\"produit-shortcode\"><img decoding=\"async\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/PHOTO-BASSIN-NIDAPLAST-EP-300x231.jpg\" alt=\"Nidaplast EP\"><div class=\"produit-info\"><p class=\"title\">Nidaplast EP<\/p><p class=\"excerpt\">The underground rainwater storage modules <strong data-start=\"311\" data-end=\"327\">nidaplast EP<\/strong> and <strong data-start=\"332\" data-end=\"347\">nidaflow EP<\/strong> are polypropylene honeycomb blocks belonging to the <strong data-start=\"400\" data-end=\"408\" data-is-only-node=\"\">SAUL<\/strong> family (Ultra-Light Honeycomb Structures).<\/p><a class=\"btn\" href=\"https:\/\/www.nidaplast.com\/en\/brands\/nidaplast-ep-range\/nidaplast-ep\/\">View product sheet<\/a><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4252384e e-con-full e-flex e-con e-child\" data-id=\"4252384e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3ca0849e elementor-widget elementor-widget-heading\" data-id=\"3ca0849e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Installation Process<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f0d880e elementor-widget elementor-widget-text-editor\" data-id=\"f0d880e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><em>Before any underground structure installation, our Design &amp; Engineering Department provides technical drawings and a layout plan specific to the project.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5457098e e-con-full e-flex e-con e-child\" data-id=\"5457098e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4ccfb877 elementor-widget elementor-widget-heading\" data-id=\"4ccfb877\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">1. Excavation<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-45a5b9b5 elementor-widget elementor-widget-text-editor\" data-id=\"45a5b9b5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Excavation of the retention area with a minimum 50 cm safety perimeter for proper geotextile wrapping.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-76d85677 e-con-full e-flex e-con e-child\" data-id=\"76d85677\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-282d5eaa elementor-widget elementor-widget-heading\" data-id=\"282d5eaa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">2. Bedding layer<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-648bc09d elementor-widget elementor-widget-text-editor\" data-id=\"648bc09d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Creation of the basin envelope using a 300 g\/m\u00b2 geotextile covering the entire structure.<br \/>A gravel bedding layer is installed on top of the geotextile.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3d0434fb e-con-full e-flex e-con e-child\" data-id=\"3d0434fb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-20c0b861 elementor-widget elementor-widget-heading\" data-id=\"20c0b861\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">3. Diffusion network<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f4d256f elementor-widget elementor-widget-text-editor\" data-id=\"4f4d256f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Upstream and downstream inspection chambers are connected by an external diffusion channel:<br \/>a perforated drain (2\/3 perforated on top) installed in a granular bed beneath the honeycomb modules.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c533985 e-con-full e-flex e-con e-child\" data-id=\"c533985\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1ed0b40 elementor-widget elementor-widget-heading\" data-id=\"1ed0b40\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">4. Laying the modules<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf8a542 elementor-widget elementor-widget-text-editor\" data-id=\"cf8a542\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Installation of the Nidaplast EP blocks according to the approved layout plan.<br \/>On this project, the retention basin consisted of three layers of EP modules.<br \/>Average installation rate: 100 m\u00b3 per worker per day.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-567ebad e-con-full e-flex e-con e-child\" data-id=\"567ebad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9879147 elementor-widget elementor-widget-heading\" data-id=\"9879147\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">5. Ventilation and basin closure<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4aed850 elementor-widget elementor-widget-text-editor\" data-id=\"4aed850\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>A ventilation system is placed on the top layer to allow air release and proper filling of the modules.<br \/>The geotextile sheets are then folded over the top of the structure.<br \/>The basin is backfilled laterally, then covered and compacted in successive layers to allow construction equipment to circulate safely.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7652d9a7 e-con-full e-flex e-con e-child\" data-id=\"7652d9a7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2f4469b2 elementor-widget elementor-widget-heading\" data-id=\"2f4469b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/youtu.be\/vtehv5roEec?si=kmp0NT1Dv0Eci3s1\" target=\"_blank\" rel=\"noopener\">Watch the installation video<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6cccd42b elementor-widget elementor-widget-video\" data-id=\"6cccd42b\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/vtehv5roEec?si=kmp0NT1Dv0Eci3s1&quot;,&quot;show_image_overlay&quot;:&quot;yes&quot;,&quot;image_overlay&quot;:{&quot;url&quot;:&quot;https:\\\/\\\/www.nidaplast.com\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/video-realisation-bassin-LIDL.webp&quot;,&quot;id&quot;:5060,&quot;size&quot;:&quot;&quot;,&quot;alt&quot;:&quot;video r\\u00e9alisation d&#039;un bassin enterr\\u00e9 pour un LIDL&quot;,&quot;source&quot;:&quot;library&quot;},&quot;start&quot;:0,&quot;mute&quot;:&quot;yes&quot;,&quot;loop&quot;:&quot;yes&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t\t\t<div class=\"elementor-custom-embed-image-overlay\" style=\"background-image: url(https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/video-realisation-bassin-LIDL.webp);\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-custom-embed-play\" role=\"button\" aria-label=\"Play Video about video r\u00e9alisation d&#039;un bassin enterr\u00e9 pour un LIDL\" tabindex=\"0\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-play\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M838 162C746 71 633 25 500 25 371 25 258 71 163 162 71 254 25 367 25 500 25 633 71 746 163 837 254 929 367 979 500 979 633 979 746 933 838 837 929 746 975 633 975 500 975 367 929 254 838 162M808 192C892 279 933 379 933 500 933 621 892 725 808 808 725 892 621 938 500 938 379 938 279 896 196 808 113 725 67 621 67 500 67 379 108 279 196 192 279 108 383 62 500 62 621 62 721 108 808 192M438 392V642L642 517 438 392Z\"><\/path><\/svg>\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6311a6fc e-con-full e-flex e-con e-child\" data-id=\"6311a6fc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-12a02acc elementor-widget elementor-widget-heading\" data-id=\"12a02acc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Results and Benefits Observed<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3d173406 elementor-widget elementor-widget-text-editor\" data-id=\"3d173406\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p>Optimal stormwater management without surface ponding<\/p><\/li><li><p>Reduced flood risk and protection of the downstream sewer network<\/p><\/li><li><p>Invisible, fully buried infrastructure<\/p><\/li><li><p>Fast installation and time savings on site<\/p><\/li><li><p>Durable structure compliant with regulatory requirements<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6e70418b e-con-full e-flex e-con e-child\" data-id=\"6e70418b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-245349e3 e-con-full e-flex e-con e-child\" data-id=\"245349e3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3fd19138 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"3fd19138\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"575\" height=\"364\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-1.webp\" class=\"attachment-large size-large wp-image-5045\" alt=\"r\u00e9alisation d&#039;un bassin de r\u00e9tention des eaux pluviales pour un LIDL\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-1.webp 575w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-1-300x190.webp 300w\" sizes=\"(max-width: 575px) 100vw, 575px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d0116c0 e-con-full e-flex e-con e-child\" data-id=\"4d0116c0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-4602f1a2 e-con-full e-flex e-con e-child\" data-id=\"4602f1a2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2884e5f4 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"2884e5f4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"166\" height=\"166\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-2.webp\" class=\"attachment-large size-large wp-image-5049\" alt=\"diffuseur externe pour un bassin de r\u00e9tention enterr\u00e9 Nidaplast\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-2.webp 166w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-2-150x150.webp 150w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-2-100x100.webp 100w\" sizes=\"(max-width: 166px) 100vw, 166px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1ec35eac e-con-full e-flex e-con e-child\" data-id=\"1ec35eac\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-416b609e elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"416b609e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"166\" height=\"166\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-3.webp\" class=\"attachment-large size-large wp-image-5053\" alt=\"pose des blocs nidaplast EP pour un bassin de r\u00e9tention pour un LIDL\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-3.webp 166w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-3-150x150.webp 150w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2025\/11\/realisation-bassin-retention-LIDL-3-100x100.webp 100w\" sizes=\"(max-width: 166px) 100vw, 166px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-68be20dd e-con-full e-flex e-con e-child\" data-id=\"68be20dd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6428e5e9 elementor-widget elementor-widget-text-editor\" data-id=\"6428e5e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>\u201cThe Nidaplast EP system proved to be the best solution to combine hydraulic performance with fast installation. An ideal choice for urban civil engineering and stormwater management projects.\u201d<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e6e39cc elementor-widget elementor-widget-heading\" data-id=\"5e6e39cc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">\u2014 Hatim \u2013 Nidaplast Design &amp; Engineering Department \u2014<\/p>\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>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Sustainable stormwater management in an urban environment Discover how Nidaplast EP modules made it possible to build a high-performance underground retention basin for the new LIDL store in Vieux-Cond\u00e9 (North of France).An efficient solution for managing stormwater while meeting spatial constraints and maintaining traffic flow in a dense urban setting. 2022 year of completion 300 [&hellip;]<\/p>\n","protected":false},"featured_media":6846,"template":"","meta":{"_acf_changed":false},"univers":[375],"categorie-realisation":[434],"class_list":["post-8345","realisations","type-realisations","status-publish","has-post-thumbnail","hentry","univers-environment","categorie-realisation-underground-basins"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/8345","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations"}],"about":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/types\/realisations"}],"version-history":[{"count":19,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/8345\/revisions"}],"predecessor-version":[{"id":898620,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/realisations\/8345\/revisions\/898620"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media\/6846"}],"wp:attachment":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media?parent=8345"}],"wp:term":[{"taxonomy":"univers","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/univers?post=8345"},{"taxonomy":"categorie-realisation","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/categorie-realisation?post=8345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}