{"id":811901,"date":"2026-03-18T10:23:00","date_gmt":"2026-03-18T08:23:00","guid":{"rendered":"https:\/\/www.nidaplast.com\/?p=811901"},"modified":"2026-06-30T09:21:31","modified_gmt":"2026-06-30T07:21:31","slug":"permeable-parking-foundation","status":"publish","type":"post","link":"https:\/\/www.nidaplast.com\/en\/permeable-parking-foundation\/","title":{"rendered":"Technical Guide: Designing the Foundation Structure of a Permeable Parking Lot"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"811901\" class=\"elementor elementor-811901 elementor-796488\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e12a51e e-con-full e-flex e-con e-parent\" data-id=\"4e12a51e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-21a057e elementor-widget elementor-widget-image\" data-id=\"21a057e\" 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=\"1920\" height=\"500\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE.jpg\" class=\"attachment-full size-full wp-image-798711\" alt=\"machine-foncation\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE.jpg 1920w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE-300x78.jpg 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE-1024x267.jpg 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE-768x200.jpg 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE-1536x400.jpg 1536w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PORTANCE-600x156.jpg 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-51ad28ec elementor-widget elementor-widget-text-editor\" data-id=\"51ad28ec\" 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 data-start=\"393\" data-end=\"484\">When designing a permeable parking lot, attention is often focused on the <a href=\"https:\/\/www.nidaplast.com\/en\/environment\/permeable-car-park-construction\/\">surface pavement<\/a>.<\/p><p data-start=\"486\" data-end=\"596\">However, the long-term performance of the system depends primarily on the quality of its foundation structure.<\/p><p data-start=\"598\" data-end=\"771\">An improperly designed foundation can lead to differential settlement, surface deformation, reduced infiltration performance and premature deterioration of the installation.<\/p><p data-start=\"773\" data-end=\"930\">For consulting engineers, civil engineering professionals and project managers, the design of a permeable parking foundation must achieve two key objectives:<\/p><ul data-start=\"932\" data-end=\"1106\"><li data-section-id=\"14514ys\" data-start=\"932\" data-end=\"1017\">ensure adequate load-bearing capacity throughout the service life of the structure;<\/li><li data-section-id=\"1342yza\" data-start=\"1018\" data-end=\"1106\">provide effective stormwater management as close as possible to the point of rainfall.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"1108\" data-end=\"1191\">The following technical considerations should be addressed during the design phase.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-24041c8 e-con-full e-flex e-con e-child\" data-id=\"24041c8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-526bd0e7 elementor-widget elementor-widget-heading\" data-id=\"526bd0e7\" 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\">Step 1: Assess the Existing Ground Conditions Before Design<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c9135a2 elementor-widget elementor-widget-text-editor\" data-id=\"6c9135a2\" 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 data-start=\"1269\" data-end=\"1547\">Before defining layer thicknesses or selecting foundation materials, it is essential to accurately characterize the existing ground conditions. The quality of the subgrade directly influences structural stability, drainage performance and long-term behavior under traffic loads.<\/p><p data-start=\"1549\" data-end=\"1594\">A geotechnical investigation helps determine:<\/p><ul data-start=\"1596\" data-end=\"1683\"><li data-section-id=\"dvn0cy\" data-start=\"1596\" data-end=\"1615\">soil composition;<\/li><li data-section-id=\"w2uls\" data-start=\"1616\" data-end=\"1639\">moisture sensitivity;<\/li><li data-section-id=\"muwm2b\" data-start=\"1640\" data-end=\"1659\">bearing capacity;<\/li><li data-section-id=\"1cul12y\" data-start=\"1660\" data-end=\"1683\">natural permeability.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"1685\" data-end=\"1839\">These parameters form the basis of the design process and are critical to ensuring the long-term performance and durability of a permeable parking system.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dc0a5d8 e-con-full e-flex e-con e-child\" data-id=\"dc0a5d8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-64abf434 elementor-widget elementor-widget-heading\" data-id=\"64abf434\" 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\">Verify the Soil Infiltration Capacity<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-422d21ff elementor-widget elementor-widget-text-editor\" data-id=\"422d21ff\" 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 data-start=\"1896\" data-end=\"2154\">Natural infiltration is one of the fundamental principles of permeable surface design. The soil&#8217;s ability to absorb water is generally expressed by the <strong data-start=\"2048\" data-end=\"2086\">permeability coefficient (K-value)<\/strong>, which indicates the rate at which water can infiltrate the ground.<\/p><p data-start=\"1896\" data-end=\"2154\">Beyond soil permeability alone, the preliminary site assessment should also consider the site&#8217;s hydrogeological conditions. Groundwater depth, the presence of low-permeability soil layers and site topography can all influence infiltration capacity and foundation design decisions. These parameters help determine the feasibility of source-control infiltration strategies and identify potential hydraulic constraints at an early stage of the project.<\/p><p data-start=\"2156\" data-end=\"2402\">Depending on site conditions, several approaches may be considered, including direct infiltration into the subgrade, progressive infiltration through the soil profile, or controlled discharge to an outlet where geotechnical conditions require it.<\/p><p data-start=\"2404\" data-end=\"2691\">This assessment plays a crucial role in modern <strong data-start=\"2451\" data-end=\"2499\">sustainable stormwater management strategies<\/strong>, including <strong data-start=\"2511\" data-end=\"2556\">Sustainable Urban Drainage Systems (SuDS)<\/strong>, <strong data-start=\"2558\" data-end=\"2590\">Low Impact Development (LID)<\/strong> practices and policies aimed at reducing soil sealing and preserving natural infiltration processes.<\/p><p data-start=\"2693\" data-end=\"2831\">It helps determine whether the existing soil can naturally absorb infiltrated runoff or whether additional drainage measures are required.<\/p><p data-start=\"2833\" data-end=\"3161\">In practice, when subgrade permeability is sufficiently high (<strong data-start=\"2895\" data-end=\"2911\">K &gt; 10\u207b\u2076 m\/s<\/strong>), infiltration can generally occur directly into the natural ground. For less permeable soils (<strong data-start=\"3007\" data-end=\"3039\">K between 10\u207b\u2077 and 10\u207b\u00b9\u00b9 m\/s<\/strong>), the use of a <strong data-start=\"3055\" data-end=\"3073\">diffuser drain<\/strong> is recommended to improve water dispersion and maintain long-term drainage performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a2257e6 e-con-full e-flex e-con e-child\" data-id=\"a2257e6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-f191c6f e-con-full enfant e-flex e-con e-child\" data-id=\"f191c6f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d6cb1ee elementor-widget elementor-widget-heading\" data-id=\"d6cb1ee\" 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\">Soil Permeability K (m\/s)<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ed2bf7f elementor-widget elementor-widget-heading\" data-id=\"ed2bf7f\" 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\">10 to 10\u207b\u2076<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-43733da elementor-widget elementor-widget-heading\" data-id=\"43733da\" 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\">10\u207b\u2077 to 10\u207b\u00b9\u00b9<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e5cc85c e-con-full enfant e-flex e-con e-child\" data-id=\"e5cc85c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-add72dc elementor-widget elementor-widget-heading\" data-id=\"add72dc\" 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\">Recommendation<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2b3314 elementor-widget elementor-widget-heading\" data-id=\"a2b3314\" 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\">No diffuser drain required<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87e1dd7 elementor-widget elementor-widget-heading\" data-id=\"87e1dd7\" 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\">Diffuser drain recommended<\/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-da444cb elementor-widget elementor-widget-heading\" data-id=\"da444cb\" 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\">Considering the Contributing Drainage Area During Project Design<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7581c1c elementor-widget elementor-widget-text-editor\" data-id=\"7581c1c\" 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 data-start=\"97\" data-end=\"372\">The design of a permeable foundation should not be limited to the parking area alone. In many projects, the system may also receive stormwater runoff from adjacent areas such as access roads, pedestrian walkways or other impermeable surfaces connected to the drainage scheme.<\/p><p data-start=\"374\" data-end=\"665\">Together, these surfaces form the project&#8217;s <strong data-start=\"418\" data-end=\"448\">contributing drainage area<\/strong>, meaning the total catchment area from which rainwater is directed towards the permeable structure. The larger the contributing area, the greater the volume of water that the foundation may be required to infiltrate.<\/p><p data-start=\"667\" data-end=\"1083\">This parameter should be evaluated during the early design stages to ensure consistency between the soil&#8217;s infiltration capacity, the expected hydraulic performance of the system and the volume of stormwater to be managed. Underestimating the contributing drainage area can lead to temporary saturation of the structure during intense rainfall events and may compromise the long-term performance of the installation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffb1f0d elementor-widget elementor-widget-image\" data-id=\"ffb1f0d\" 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=\"1920\" height=\"500\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL.jpg\" class=\"attachment-full size-full wp-image-798703\" alt=\"capacit\u00e9 d&#039;infiltration d&#039;eau\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL.jpg 1920w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL-300x78.jpg 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL-1024x267.jpg 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL-768x200.jpg 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL-1536x400.jpg 1536w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/PERMABILITE-DU-SOL-600x156.jpg 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\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<div class=\"elementor-element elementor-element-31f6846c e-con-full e-flex e-con e-child\" data-id=\"31f6846c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3737f00e elementor-widget elementor-widget-heading\" data-id=\"3737f00e\" 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\">Step 2: Define the Load-Bearing Requirements<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6ccee44 e-con-full e-flex e-con e-child\" data-id=\"6ccee44\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e9bda1 elementor-widget elementor-widget-text-editor\" data-id=\"1e9bda1\" 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 data-start=\"3462\" data-end=\"3595\">The foundation structure must be designed according to the actual loads the parking area will experience throughout its service life.<\/p><p data-start=\"3597\" data-end=\"3828\">Mechanical stresses vary considerably depending on traffic conditions, whether the facility is intended for passenger vehicles, office developments, commercial premises, logistics areas, service vehicles or emergency access routes.<\/p><p data-start=\"3830\" data-end=\"3971\">Underestimating traffic loads is one of the most common causes of premature deformation and structural failure in permeable pavement systems.<\/p><p data-start=\"3973\" data-end=\"4092\">Indicative bearing capacity targets measured through plate load testing may vary depending on the intended application:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b2f2bd elementor-widget elementor-widget-text-editor\" data-id=\"0b2f2bd\" 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 data-start=\"2730\" data-end=\"2839\">Indicative bearing capacity targets measured through plate load testing may vary depending on the intended application:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-69fe854 e-con-full e-flex e-con e-child\" data-id=\"69fe854\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a30ad38 e-con-full enfant e-flex e-con e-child\" data-id=\"a30ad38\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2c876fe elementor-widget elementor-widget-heading\" data-id=\"2c876fe\" 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\">Application Type<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b92066d elementor-widget elementor-widget-heading\" data-id=\"b92066d\" 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\">Residential or office parking (light vehicles)<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b73c70c elementor-widget elementor-widget-heading\" data-id=\"b73c70c\" 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\">High-use commercial parking<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-08a3d21 elementor-widget elementor-widget-heading\" data-id=\"08a3d21\" 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\">Utility vehicle parking<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be016b0 elementor-widget elementor-widget-heading\" data-id=\"be016b0\" 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\">Logistics areas or heavy vehicle traffic<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ff7033 elementor-widget elementor-widget-heading\" data-id=\"1ff7033\" 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\">Emergency access roads \/ fire lanes<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-75de896 e-con-full enfant e-flex e-con e-child\" data-id=\"75de896\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-56d6860 elementor-widget elementor-widget-heading\" data-id=\"56d6860\" 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\">Indicative EV2 Bearing Capacity<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9dcaae8 elementor-widget elementor-widget-heading\" data-id=\"9dcaae8\" 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 50 MPa<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e555a33 elementor-widget elementor-widget-heading\" data-id=\"e555a33\" 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 60 to 80 MPa<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e669d6b elementor-widget elementor-widget-heading\" data-id=\"e669d6b\" 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 80 to 120 MPa<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1d32d71 elementor-widget elementor-widget-heading\" data-id=\"1d32d71\" 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 120 MPa<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b7fcbd0 elementor-widget elementor-widget-heading\" data-id=\"b7fcbd0\" 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 120 to 150 MPa<\/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-5558915 elementor-widget elementor-widget-text-editor\" data-id=\"5558915\" 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 data-start=\"4468\" data-end=\"4727\">These values are provided for guidance only and should always be validated through a geotechnical assessment and project-specific engineering requirements. Final design criteria depend on subgrade conditions, applied loads and the selected pavement structure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e1d7d06 elementor-widget elementor-widget-heading\" data-id=\"e1d7d06\" 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\">Understanding Plate Load Tests and EV1 \/ EV2 Moduli<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-12374ba elementor-widget elementor-widget-text-editor\" data-id=\"12374ba\" 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 data-start=\"4798\" data-end=\"4987\">Before foundation layers are installed, platform bearing capacity is commonly verified using a <strong data-start=\"4893\" data-end=\"4912\">plate load test<\/strong>, a standard procedure widely used in earthworks and pavement construction.<\/p><p data-start=\"4989\" data-end=\"5248\">The test consists of applying successive loading cycles to a circular steel plate resting on the soil surface and measuring the resulting deformation. The objective is to assess the ability of the ground to withstand future loads without excessive settlement.<\/p><p data-start=\"5250\" data-end=\"5287\">The test provides two key indicators:<\/p><ul data-start=\"5289\" data-end=\"5478\"><li data-section-id=\"1xxia50\" data-start=\"5289\" data-end=\"5362\"><strong data-start=\"5291\" data-end=\"5298\">EV1<\/strong>, representing the soil response during the first loading cycle;<\/li><li data-section-id=\"1381z80\" data-start=\"5363\" data-end=\"5478\"><strong data-start=\"5365\" data-end=\"5372\">EV2<\/strong>, measured during the second loading cycle and reflecting the effective bearing capacity after compaction.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"5480\" data-end=\"5632\">In practice, the <strong data-start=\"5497\" data-end=\"5512\">EV2 modulus<\/strong> is the most commonly used parameter for validating platform quality before the installation of upper structural layers.<\/p><p data-start=\"5634\" data-end=\"5859\">The <strong data-start=\"5638\" data-end=\"5655\">EV2\/EV1 ratio<\/strong> is also an important indicator. Excessively high values may reveal insufficient compaction or heterogeneous ground conditions, whereas a controlled ratio generally indicates a properly prepared platform.<\/p><p data-start=\"5861\" data-end=\"6020\">For permeable parking projects, these tests help verify that the supporting structure will withstand operational loads while maintaining long-term performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-de2e991 elementor-widget elementor-widget-image\" data-id=\"de2e991\" 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=\"768\" height=\"200\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/TEST-PORTANCE-DU-SOL.webp\" class=\"attachment-full size-full wp-image-803330\" alt=\"portance du sol\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/TEST-PORTANCE-DU-SOL.webp 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/TEST-PORTANCE-DU-SOL-300x78.webp 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/TEST-PORTANCE-DU-SOL-600x156.webp 600w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\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<div class=\"elementor-element elementor-element-78379ee e-con-full e-flex e-con e-child\" data-id=\"78379ee\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cec8e22 elementor-widget elementor-widget-heading\" data-id=\"cec8e22\" 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\">Step 3: Design a Structural and Draining Foundation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21b5644 elementor-widget elementor-widget-text-editor\" data-id=\"21b5644\" 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 data-start=\"6090\" data-end=\"6363\">The foundation structure performs a dual function: it transfers loads to the natural ground while supporting stormwater management through its drainage and temporary water storage capacity. Its design must therefore balance structural performance with hydraulic efficiency.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ebb634a elementor-widget elementor-widget-heading\" data-id=\"ebb634a\" 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\">The Role of the Formation Layer<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2d9ddc elementor-widget elementor-widget-text-editor\" data-id=\"e2d9ddc\" 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 data-start=\"6414\" data-end=\"6510\">The formation layer provides the interface between the natural ground and the foundation layers.<\/p><p data-start=\"6512\" data-end=\"6534\">Its functions include:<\/p><ul data-start=\"6536\" data-end=\"6711\"><li data-section-id=\"1pvdq2v\" data-start=\"6536\" data-end=\"6574\">creating a uniform support platform;<\/li><li data-section-id=\"1af4k5o\" data-start=\"6575\" data-end=\"6604\">improving bearing capacity;<\/li><li data-section-id=\"14iutef\" data-start=\"6605\" data-end=\"6649\">reducing the risk of localized settlement;<\/li><li data-section-id=\"1h7wrgr\" data-start=\"6650\" data-end=\"6711\">preparing the surface for the installation of upper layers.<\/li><\/ul><p data-start=\"6713\" data-end=\"6834\">Depending on site conditions, this layer may require specific adaptations identified through the geotechnical assessment.<\/p><p data-start=\"6713\" data-end=\"6834\">In some projects, the formation layer can also compensate for limitations in the natural ground when the existing subgrade does not provide the required bearing capacity or infiltration performance for the intended application. In such cases, it acts as a critical interface between the subgrade and the foundation structure, contributing both to the long-term stability of the pavement and to its hydraulic performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5c5060 elementor-widget elementor-widget-heading\" data-id=\"d5c5060\" 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\">How Should Foundation Thickness Be Determined?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-df1a6f5 elementor-widget elementor-widget-text-editor\" data-id=\"df1a6f5\" 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 data-start=\"6900\" data-end=\"6959\">There is no universal thickness suitable for <a href=\"https:\/\/www.nidaplast.com\/en\/case-studies\/?univers=environnement\">every project<\/a>.<\/p><p data-start=\"6961\" data-end=\"7017\">Foundation design depends on several factors, including:<\/p><ul data-start=\"7019\" data-end=\"7096\"><li data-section-id=\"1ni5r4y\" data-start=\"7019\" data-end=\"7047\">subgrade bearing capacity;<\/li><li data-section-id=\"f04c1x\" data-start=\"7048\" data-end=\"7074\">expected traffic levels;<\/li><li data-section-id=\"1xh81or\" data-start=\"7075\" data-end=\"7096\">concentrated loads.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"7098\" data-end=\"7202\">Each project requires a dedicated engineering assessment to ensure long-term durability and performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-101f098 elementor-widget elementor-widget-image\" data-id=\"101f098\" 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=\"1920\" height=\"500\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier.jpg\" class=\"attachment-full size-full wp-image-798707\" alt=\"epaisseur de la fondation\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier.jpg 1920w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier-300x78.jpg 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier-1024x267.jpg 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier-768x200.jpg 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier-1536x400.jpg 1536w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/chantier-600x156.jpg 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7fcc9f elementor-widget elementor-widget-heading\" data-id=\"d7fcc9f\" 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\">Adapting the Foundation to the Final Surface Finish<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-509c60e elementor-widget elementor-widget-text-editor\" data-id=\"509c60e\" 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 data-start=\"62\" data-end=\"243\">Foundation design is influenced not only by traffic loads and subgrade conditions but also by the type of permeable surface selected and the performance requirements of the project.<\/p><p data-start=\"245\" data-end=\"595\">For mineral-based parking areas, the primary function of the foundation is to provide structural support and ensure efficient stormwater drainage. Vegetated areas, however, introduce additional design considerations. In these applications, the foundation must support plant growth while maintaining its structural and hydraulic performance over time.<\/p><p data-start=\"597\" data-end=\"844\">Foundations intended for grassed or landscaped surfaces may therefore incorporate specific materials, such as soil-aggregate blends, which combine water permeability, load-bearing capacity and the conditions necessary for healthy root development.<\/p><p data-start=\"846\" data-end=\"1151\" data-is-last-node=\"\" data-is-only-node=\"\">Regardless of the solution chosen, foundation layers should be carefully levelled and their bearing capacity verified before the installation of the final surface. This step helps ensure uniform performance across the entire parking area and reduces the risk of differential settlement over the long term.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-724dd44 elementor-widget elementor-widget-image\" data-id=\"724dd44\" 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=\"1920\" height=\"500\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation.webp\" class=\"attachment-full size-full wp-image-813202\" alt=\"exemple de fondation\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation.webp 1920w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation-300x78.webp 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation-1024x267.webp 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation-768x200.webp 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation-1536x400.webp 1536w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/03\/exemple-de-fondation-600x156.webp 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-af8ebdd elementor-widget elementor-widget-text-editor\" data-id=\"af8ebdd\" 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 data-start=\"368\" data-end=\"602\"><em><strong>Figure 1<\/strong> \u2013 Example of a permeable parking foundation structure. The composition and thickness of each layer should be adapted to the specific project requirements and validated through a geotechnical assessment.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d5283a elementor-widget elementor-widget-shortcode\" data-id=\"6d5283a\" 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\/DALLE-PAV65-300x231.jpg\" alt=\"Slab PAV65\"><div class=\"produit-info\"><p class=\"title\">Slab PAV65<\/p><p class=\"excerpt\">The Ocity PAV65 slab is specifically designed for installing 15 \u00d7 15 \u00d7 6 cm pavers. Its structure ensures perfect alignment and excellent mechanical strength. Ideal for car parks, driveways, and trafficable areas, it facilitates the creation of durable and permeable surfaces.<\/p><a class=\"btn\" href=\"https:\/\/www.nidaplast.com\/en\/brands\/ocity-range\/ocity-pav65\/\">View product sheet<\/a><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-97d53f5 elementor-widget elementor-widget-shortcode\" data-id=\"97d53f5\" 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\/DALLE-NGR65-300x231.jpg\" alt=\"Slab NGR65\"><div class=\"produit-info\"><p class=\"title\">Slab NGR65<\/p><p class=\"excerpt\">The Ocity slab stabilizes both gravel and grassed surfaces while preserving soil permeability. Its honeycomb structure provides excellent mechanical strength and ensures a stable, driveable surface as well as deep grass rooting. Ideal for urban landscaping, it combines functionality, drainage, and long-lasting aesthetics.<\/p><a class=\"btn\" href=\"https:\/\/www.nidaplast.com\/en\/brands\/ocity-range\/ocity-ngr65\/\">View product sheet<\/a><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aea1b97 e-con-full e-flex e-con e-child\" data-id=\"aea1b97\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-24611b7 elementor-widget elementor-widget-heading\" data-id=\"24611b7\" 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\">Most Common Design Mistakes<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87e482e elementor-widget elementor-widget-text-editor\" data-id=\"87e482e\" 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 data-start=\"5257\" data-end=\"5327\">Even when high-performance permeable paving systems are used, certain design errors can compromise the overall effectiveness of the parking lot.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4250ee3 elementor-widget elementor-widget-heading\" data-id=\"4250ee3\" 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\">Neglecting Subgrade Quality<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-552d600 elementor-widget elementor-widget-text-editor\" data-id=\"552d600\" 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 data-start=\"3851\" data-end=\"3929\">Insufficient ground investigation can result in differential settlement and long-term structural issues.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-97381c5 elementor-widget elementor-widget-heading\" data-id=\"97381c5\" 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\">Undersizing the Foundation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-278737f elementor-widget elementor-widget-text-editor\" data-id=\"278737f\" 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 data-start=\"5257\" data-end=\"5327\">Reducing foundation thicknesses to lower construction costs often leads to a shorter service life.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c00ba74 elementor-widget elementor-widget-heading\" data-id=\"c00ba74\" 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\">Using Poorly Draining Materials<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1feea00 elementor-widget elementor-widget-text-editor\" data-id=\"1feea00\" 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 data-start=\"6236\" data-end=\"6334\">A foundation that becomes clogged over time gradually loses its hydraulic performance. Material selection is therefore a critical aspect of the design process.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bd8e7ce elementor-widget elementor-widget-heading\" data-id=\"bd8e7ce\" 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\">Confusing Bearing Capacity with Excessive Compaction<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2a1c9dc elementor-widget elementor-widget-text-editor\" data-id=\"2a1c9dc\" 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 data-start=\"6467\" data-end=\"6598\">Over-compaction can reduce permeability within certain layers and negatively affect infiltration performance. The objective is to achieve the right balance between structural stability and hydraulic functionality.<\/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-d852ac7 e-con-full e-flex e-con e-child\" data-id=\"d852ac7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5e8c400 elementor-widget elementor-widget-heading\" data-id=\"5e8c400\" 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\">Integrating Regulatory and Environmental Requirements from the Start<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b382508 elementor-widget elementor-widget-text-editor\" data-id=\"b382508\" 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 data-start=\"8221\" data-end=\"8422\">Today, parking lot design extends beyond traffic management alone. Project owners and developers must also address runoff control, source-control stormwater management and soil preservation objectives.<\/p><p data-start=\"8424\" data-end=\"8782\">Across many countries, planning authorities increasingly encourage sustainable drainage practices, the reduction of impervious surfaces and the preservation of natural hydrological processes. These policies are often aligned with broader environmental goals such as reducing land take, limiting soil sealing and promoting climate-resilient urban development.<\/p><p data-start=\"8784\" data-end=\"8948\">Permeable parking systems contribute directly to these objectives by promoting natural infiltration and reducing dependence on conventional drainage infrastructure.<\/p><p data-start=\"8950\" data-end=\"9144\">A properly designed foundation therefore plays a key role in meeting both hydraulic and environmental performance targets established by local planning authorities and sustainability frameworks.<\/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-52872be e-con-full e-flex e-con e-child\" data-id=\"52872be\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c108b7b elementor-widget elementor-widget-heading\" data-id=\"c108b7b\" 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\">Summary<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ef37523 elementor-widget elementor-widget-text-editor\" data-id=\"ef37523\" 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 data-start=\"9170\" data-end=\"9254\">The success of a permeable parking lot begins long before the pavement is installed.<\/p><p data-start=\"9256\" data-end=\"9321\">A high-performing foundation relies on four essential principles:<\/p><ul data-start=\"9323\" data-end=\"9512\"><li data-section-id=\"10lz3t1\" data-start=\"9323\" data-end=\"9366\">accurately assessing subgrade conditions;<\/li><li data-section-id=\"1ktloy6\" data-start=\"9367\" data-end=\"9424\">verifying bearing capacity through appropriate testing;<\/li><li data-section-id=\"1094l0x\" data-start=\"9425\" data-end=\"9465\">correctly designing foundation layers;<\/li><li data-section-id=\"136ze6z\" data-start=\"9466\" data-end=\"9512\">maintaining long-term hydraulic performance.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"9514\" data-end=\"9664\">This approach helps combine structural durability, source-control stormwater management and compliance with modern sustainable development objectives.<\/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-1b5fb82 e-con-full e-flex e-con e-child\" data-id=\"1b5fb82\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-668016c elementor-widget elementor-widget-image\" data-id=\"668016c\" 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=\"1920\" height=\"500\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea.jpg\" class=\"attachment-full size-full wp-image-798699\" alt=\"\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea.jpg 1920w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea-300x78.jpg 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea-1024x267.jpg 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea-768x200.jpg 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea-1536x400.jpg 1536w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/06\/permea-600x156.jpg 600w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3bc0553 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"3bc0553\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.nidaplast.com\/en\/environment\/permeable-car-park-construction\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Our Permeable Parking Solutions<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-796eb29 e-con-full e-flex e-con e-child\" data-id=\"796eb29\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-05c593b elementor-widget elementor-widget-spacer\" data-id=\"05c593b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cedc142 elementor-widget elementor-widget-heading\" data-id=\"cedc142\" 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\">Technical Appendix \u2013 Glossary<\/p>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c5d49ba e-con-full e-flex e-con e-child\" data-id=\"c5d49ba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-3742e82 e-con-full enfant e-flex e-con e-child\" data-id=\"3742e82\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-463f5f5 elementor-widget elementor-widget-heading\" data-id=\"463f5f5\" 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\">Term<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f040f4 elementor-widget elementor-widget-heading\" data-id=\"6f040f4\" 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\">EV1<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a7e2c28 elementor-widget elementor-widget-heading\" data-id=\"a7e2c28\" 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\">EV2<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3794253 elementor-widget elementor-widget-heading\" data-id=\"3794253\" 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\">Granular Subbase<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-61b03df elementor-widget elementor-widget-heading\" data-id=\"61b03df\" 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\">Formation Layer<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ffa79fe elementor-widget elementor-widget-heading\" data-id=\"ffa79fe\" 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\">K-Value<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-49065e5 elementor-widget elementor-widget-heading\" data-id=\"49065e5\" 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\">SuDS<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f20618 elementor-widget elementor-widget-heading\" data-id=\"8f20618\" 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\">LID<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3fa10d elementor-widget elementor-widget-heading\" data-id=\"a3fa10d\" 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\">Soil Sealing<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d784ab5 e-con-full enfant e-flex e-con e-child\" data-id=\"d784ab5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bdf28c6 elementor-widget elementor-widget-heading\" data-id=\"bdf28c6\" 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\">Definition<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dd72697 elementor-widget elementor-widget-heading\" data-id=\"dd72697\" 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\">Modulus measured during the first loading cycle of a plate load test<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88d8d25 elementor-widget elementor-widget-heading\" data-id=\"88d8d25\" 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\">Modulus measured during the second loading cycle of a plate load test<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e01ca5 elementor-widget elementor-widget-heading\" data-id=\"6e01ca5\" 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\"><span style=\", sans-serif\">Unbound aggregate layer used to distribute loads and provide drainage <\/span><span style=\", sans-serif\"><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4b666f5 elementor-widget elementor-widget-heading\" data-id=\"4b666f5\" 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\">Prepared surface forming the interface between natural ground and pavement structure<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7088d06 elementor-widget elementor-widget-heading\" data-id=\"7088d06\" 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\">Soil permeability coefficient expressed in m\/s<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be0615a elementor-widget elementor-widget-heading\" data-id=\"be0615a\" 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\">Sustainable Urban Drainage Systems<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-49228e8 elementor-widget elementor-widget-heading\" data-id=\"49228e8\" 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\">Low Impact Development stormwater management approach<\/p>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-632da8d elementor-widget elementor-widget-heading\" data-id=\"632da8d\" 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\">The covering of natural soil with impermeable materials, reducing infiltration capacity<\/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>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>When designing a permeable parking lot, attention is often focused on the surface pavement. However, the long-term performance of the system depends primarily on the quality of its foundation structure. An improperly designed foundation can lead to differential settlement, surface deformation, reduced infiltration performance and premature deterioration of the installation. For consulting engineers, civil engineering [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":809749,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[391,387],"tags":[],"univers":[],"class_list":["post-811901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment-and-sustainable-development","category-nidaplast-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/811901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/comments?post=811901"}],"version-history":[{"count":26,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/811901\/revisions"}],"predecessor-version":[{"id":897014,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/811901\/revisions\/897014"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media\/809749"}],"wp:attachment":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media?parent=811901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/categories?post=811901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/tags?post=811901"},{"taxonomy":"univers","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/univers?post=811901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}