{"id":1045414,"date":"2026-01-24T11:16:50","date_gmt":"2026-01-24T09:16:50","guid":{"rendered":"https:\/\/www.nidaplast.com\/entretien-curage-separateur-hydrocarbures\/"},"modified":"2026-09-03T14:08:56","modified_gmt":"2026-09-03T12:08:56","slug":"stormwater-basin-maintenance","status":"publish","type":"post","link":"https:\/\/www.nidaplast.com\/en\/entretien-curage-separateur-hydrocarbures\/","title":{"rendered":"Stormwater basin maintenance: cleaning, TSS and oil separators"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1045414\" class=\"elementor elementor-1045414 elementor-1018717\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e8ee9cc e-flex e-con-boxed e-con e-parent\" data-id=\"e8ee9cc\" 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-7df5bbe elementor-widget elementor-widget-text-editor\" data-id=\"7df5bbe\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"996\" data-end=\"1471\"><strong data-start=\"996\" data-end=\"1134\">Maintaining a stormwater basin helps preserve its effective storage volume, hydraulic performance and the quality of discharged water.<\/strong> The gradual accumulation of total suspended solids (TSS), sediment and debris can reduce storage capacity, cause blockages and affect the flow control system. Where stormwater is potentially polluted, maintaining pre-treatment systems also helps limit the transfer of pollutants to the drainage network, ground or receiving environment.<\/p><p data-start=\"1473\" data-end=\"1618\">An effective maintenance strategy should therefore combine <strong data-start=\"1532\" data-end=\"1618\">regular inspections, cleaning, sediment removal and checks of hydraulic equipment.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-87c7cdc e-con-full e-flex e-con e-child\" data-id=\"87c7cdc\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2c1cff elementor-widget elementor-widget-text-editor\" data-id=\"e2c1cff\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3>Stormwater basin maintenance in 5 key points<\/h3><p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"1675\" data-end=\"1774\"><strong data-start=\"1675\" data-end=\"1689\">Objective:<\/strong> preserve effective storage volume, flow control and the quality of discharged water.<\/p><p data-start=\"1776\" data-end=\"1866\"><strong data-start=\"1776\" data-end=\"1788\">Monitor:<\/strong> TSS, sediment, sludge, debris and any hydrocarbons carried by surface runoff.<\/p><p data-start=\"1868\" data-end=\"1986\"><strong data-start=\"1868\" data-end=\"1880\">Inspect:<\/strong> access chambers, grilles, drains and inspection channels, pre-treatment systems and flow control devices.<\/p><p data-start=\"1988\" data-end=\"2127\"><strong data-start=\"1988\" data-end=\"2001\">Maintain:<\/strong> remove debris, extract sludge and sediment, and carry out hydro-jetting when the accumulation of deposits makes it necessary.<\/p><p data-start=\"2129\" data-end=\"2330\"><strong data-start=\"2129\" data-end=\"2140\">Record:<\/strong> extracted materials must be characterised and sent to an appropriate waste treatment route. Where classified as hazardous waste, the applicable waste tracking requirements must be followed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bf5cb1f elementor-widget elementor-widget-heading\" data-id=\"bf5cb1f\" 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\">What are the risks of poor stormwater basin maintenance ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8243ff5 elementor-widget elementor-widget-text-editor\" data-id=\"8243ff5\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"2399\" data-end=\"2637\"><strong data-start=\"2399\" data-end=\"2637\">A poorly maintained stormwater basin can gradually lose some of its hydraulic performance: sediment and sludge occupy storage volume, pipes can become blocked and flow control devices may no longer provide the intended discharge rate.<\/strong><\/p><p data-start=\"2639\" data-end=\"2813\">Surface runoff does not carry water alone. As it flows across the catchment, it collects material from roofs, roads, car parks, landscaped areas and other developed surfaces.<\/p><p data-start=\"2815\" data-end=\"3012\">Some of this material is transported as <strong data-start=\"2855\" data-end=\"2887\">total suspended solids (TSS)<\/strong> before potentially settling within stormwater management systems, depending on its characteristics and hydraulic conditions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2d8464 elementor-widget elementor-widget-heading\" data-id=\"e2d8464\" 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\">What are total suspended solids (TSS) in stormwater ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9d2b43 elementor-widget elementor-widget-text-editor\" data-id=\"d9d2b43\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"3077\" data-end=\"3323\"><strong data-start=\"3077\" data-end=\"3193\">Total suspended solids (TSS) are solid particles carried by surface runoff without being dissolved in the water.<\/strong> They can originate from dust and particles deposited on surfaces, soil erosion, organic matter, and wear from roads and vehicles.<\/p><p data-start=\"3325\" data-end=\"3558\">During rainfall, runoff carries these particles from <strong data-start=\"3378\" data-end=\"3425\">roofs, roads, car parks and developed areas<\/strong> into drainage networks and stormwater management systems. Some suspended solids can also carry pollutants attached to the particles.<\/p><p data-start=\"3560\" data-end=\"3847\">When water velocity decreases, particularly in areas where settlement can occur, some of the suspended solids gradually settle. These settled particles form <strong data-start=\"3717\" data-end=\"3729\">sediment<\/strong>, which can accumulate with other materials at the bottom of the system and contribute to the formation of <strong data-start=\"3836\" data-end=\"3846\">sludge<\/strong>.<\/p><p data-start=\"3849\" data-end=\"3899\">The three terms should therefore be distinguished:<\/p><ul data-start=\"3901\" data-end=\"4138\"><li data-section-id=\"15ege21\" data-start=\"3901\" data-end=\"3957\"><strong data-start=\"3903\" data-end=\"3911\">TSS:<\/strong> particles carried in suspension in the water;<\/li><li data-section-id=\"14dcld0\" data-start=\"3958\" data-end=\"4019\"><strong data-start=\"3960\" data-end=\"3973\">sediment:<\/strong> particles that have settled out of the water;<\/li><li data-section-id=\"p04h5l\" data-start=\"4020\" data-end=\"4138\"><strong data-start=\"4022\" data-end=\"4033\">sludge:<\/strong> deposits accumulated at the bottom of the system that may need to be removed during cleaning operations.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-411f5fc elementor-widget elementor-widget-heading\" data-id=\"411f5fc\" 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 does sediment and sludge accumulation reduce effective storage volume?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a771a3 elementor-widget elementor-widget-text-editor\" data-id=\"7a771a3\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"4225\" data-end=\"4375\"><strong data-start=\"4225\" data-end=\"4375\">The gradual accumulation of deposits at the bottom of a stormwater system occupies part of the volume originally available for storing stormwater.<\/strong><\/p><p data-start=\"4377\" data-end=\"4407\">Over time, this can result in:<\/p><ul data-start=\"4409\" data-end=\"4656\"><li data-section-id=\"1v1ozij\" data-start=\"4409\" data-end=\"4444\">reduced effective storage volume;<\/li><li data-section-id=\"1qdua78\" data-start=\"4445\" data-end=\"4474\">slower or obstructed flows;<\/li><li data-section-id=\"14r07ah\" data-start=\"4475\" data-end=\"4503\">blockage of certain pipes;<\/li><li data-section-id=\"xyt33l\" data-start=\"4504\" data-end=\"4541\">disruption of flow control devices;<\/li><li data-section-id=\"uxzm0p\" data-start=\"4542\" data-end=\"4604\">resuspension of deposits during significant rainfall events;<\/li><li data-section-id=\"3coiq\" data-start=\"4605\" data-end=\"4656\">deterioration in the quality of discharged water.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"4658\" data-end=\"4812\">Maintenance is therefore not simply about keeping the system clean: <strong data-start=\"4726\" data-end=\"4812\">it helps maintain the hydraulic performance established during the design process.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28cd042 elementor-widget elementor-widget-image\" data-id=\"28cd042\" 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=\"800\" height=\"450\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/BOUE-DANS-CANAL.webp\" class=\"attachment-large size-large wp-image-1018955\" alt=\"boue-canal-s\u00e9dimentation\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/BOUE-DANS-CANAL.webp 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/BOUE-DANS-CANAL-300x169.webp 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/BOUE-DANS-CANAL-768x432.webp 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/BOUE-DANS-CANAL-600x338.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\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-463cf13 elementor-widget elementor-widget-heading\" data-id=\"463cf13\" 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\">Silt traps and oil separators: when is pre-treatment required?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-afff889 elementor-widget elementor-widget-text-editor\" data-id=\"afff889\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"4887\" data-end=\"5143\"><strong data-start=\"4887\" data-end=\"5143\">Stormwater that may contain high levels of sediment or be polluted by hydrocarbons can require pre-treatment before storage, infiltration or discharge. The appropriate system depends on the pollution risk and the requirements applicable to the project.<\/strong><\/p><p data-start=\"5145\" data-end=\"5261\">A <strong data-start=\"5147\" data-end=\"5160\">silt trap<\/strong> encourages heavier particles and sediment to settle before they reach downstream stormwater systems.<\/p><p data-start=\"5263\" data-end=\"5502\">An <strong data-start=\"5266\" data-end=\"5283\">oil separator<\/strong> is designed to retain non-emulsified hydrocarbons present in collected water. These systems may be used on certain industrial sites, traffic areas, car parks or other surfaces where an identified pollution risk exists.<\/p><p data-start=\"5504\" data-end=\"5677\">However, an oil separator should not be considered automatically necessary for every stormwater management project. The need for treatment should be determined according to:<\/p><ul data-start=\"5679\" data-end=\"5926\"><li data-section-id=\"zej50s\" data-start=\"5679\" data-end=\"5710\">the type of surfaces drained;<\/li><li data-section-id=\"zwhgl2\" data-start=\"5711\" data-end=\"5752\">the activities carried out on the site;<\/li><li data-section-id=\"b98h28\" data-start=\"5753\" data-end=\"5783\">the level of pollution risk;<\/li><li data-section-id=\"13as3ve\" data-start=\"5784\" data-end=\"5826\">the method of discharge or infiltration;<\/li><li data-section-id=\"1rbovw9\" data-start=\"5827\" data-end=\"5852\">applicable regulations;<\/li><li data-section-id=\"1it2iu2\" data-start=\"5853\" data-end=\"5926\">requirements set by the relevant drainage authority or local authority.<\/li><\/ul><p>\u00a0<\/p><p data-start=\"5928\" data-end=\"6060\">Some sites subject to specific environmental regulations may, for example, be required to treat potentially contaminated stormwater.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e28bb4e elementor-widget elementor-widget-heading\" data-id=\"e28bb4e\" 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\">Why should an oil separator be maintained?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0d9a7eb elementor-widget elementor-widget-text-editor\" data-id=\"0d9a7eb\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"6115\" data-end=\"6239\"><strong data-start=\"6115\" data-end=\"6239\">An oil separator that is saturated with sludge or hydrocarbons can no longer perform its treatment function effectively.<\/strong><\/p><p data-start=\"6241\" data-end=\"6490\">Maintenance includes checking the level of sludge, the quantity of accumulated hydrocarbons and the operation of associated equipment, including the automatic closure device, coalescing device where fitted, and the inlet and outlet of the separator.<\/p><p data-start=\"6492\" data-end=\"6748\">The frequency of emptying depends on the site and the applicable regulations. Specific regulated facilities may, for example, be subject to requirements concerning the maximum permitted accumulation of sludge and minimum inspection or cleaning frequencies.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2c613f elementor-widget elementor-widget-heading\" data-id=\"c2c613f\" 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\">What maintenance schedule should be used for a stormwater basin?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dcbb9ab elementor-widget elementor-widget-text-editor\" data-id=\"dcbb9ab\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"6825\" data-end=\"6960\">Maintenance frequency depends on the design of the system, its environment, its use and the quantity of material carried by stormwater.<\/p><p data-start=\"6962\" data-end=\"7002\">Regular monitoring can include checking:<\/p><ul data-start=\"7004\" data-end=\"7221\"><li data-section-id=\"ia1x9z\" data-start=\"7004\" data-end=\"7054\">the accumulation of debris, sludge and sediment;<\/li><li data-section-id=\"thpk42\" data-start=\"7055\" data-end=\"7115\">the condition of access chambers and accessible equipment;<\/li><li data-section-id=\"fdsrnv\" data-start=\"7116\" data-end=\"7140\">pre-treatment systems;<\/li><li data-section-id=\"1hiidql\" data-start=\"7141\" data-end=\"7164\">flow control devices;<\/li><li data-section-id=\"1cwdmqc\" data-start=\"7165\" data-end=\"7221\">whether sediment removal or hydro-jetting is required.<\/li><\/ul><div>\u00a0<\/div><p data-start=\"7223\" data-end=\"7380\">Maintenance frequencies should be adapted to <strong data-start=\"7268\" data-end=\"7379\">site characteristics, the requirements of the installed equipment and any applicable regulatory obligations<\/strong>.<\/p><p data-start=\"7382\" data-end=\"7502\">Additional inspections may also be necessary following an exceptional event, accidental spill or identified malfunction.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6f951b4 elementor-widget elementor-widget-heading\" data-id=\"6f951b4\" 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\">How are stormwater basins cleaned and hydro-jetted?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0d1256e elementor-widget elementor-widget-text-editor\" data-id=\"0d1256e\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"7566\" data-end=\"7796\"><strong data-start=\"7566\" data-end=\"7796\">Cleaning involves removing sludge, sediment and debris accumulated within the system. Hydro-jetting uses pressurised water, together with suction, to clean accessible pipes and equipment within the stormwater drainage network.<\/strong><\/p><p data-start=\"7798\" data-end=\"8026\">The method of intervention depends on the design of the basin, its accessibility, the level of accumulated material and the equipment installed. Depending on the system configuration, maintenance may include the following steps.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4d199a elementor-widget elementor-widget-heading\" data-id=\"c4d199a\" 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\">1. CCTV inspection<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-162a64a elementor-widget elementor-widget-text-editor\" data-id=\"162a64a\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"8057\" data-end=\"8193\">The operator identifies areas of accumulation, checks access to chambers and determines which parts of the network require intervention.<\/p><p data-start=\"8195\" data-end=\"8357\"><strong data-start=\"8195\" data-end=\"8357\">A CCTV inspection provides a visual assessment of accessible parts of the network and can accurately locate defects or problems before or after hydro-jetting.<\/strong><\/p><p data-start=\"8359\" data-end=\"8458\">Introduced through an access chamber or other dedicated access point, the camera can help identify:<\/p><ul data-start=\"8460\" data-end=\"8610\"><li data-section-id=\"13gs8zz\" data-start=\"8460\" data-end=\"8497\">deposits and sediment accumulation;<\/li><li data-section-id=\"151uh86\" data-start=\"8498\" data-end=\"8526\">obstructions or blockages;<\/li><li data-section-id=\"1jguqfs\" data-start=\"8527\" data-end=\"8536\">debris;<\/li><li data-section-id=\"h07pxv\" data-start=\"8537\" data-end=\"8571\">possible deterioration of pipes;<\/li><li data-section-id=\"effyaa\" data-start=\"8572\" data-end=\"8610\">defects or anomalies at connections.<\/li><\/ul><div>\u00a0<\/div><p data-start=\"8612\" data-end=\"8771\">A CCTV inspection can also be carried out <strong data-start=\"8654\" data-end=\"8770\">after hydro-jetting to assess the condition of the network and check the effectiveness of the cleaning operation<\/strong>.<\/p><p data-start=\"8773\" data-end=\"8942\">For <strong data-start=\"8777\" data-end=\"8810\">underground stormwater basins<\/strong>, the ability to use CCTV equipment depends directly on the design of the system and the accessibility of the areas to be inspected.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2bef7b elementor-widget elementor-widget-image\" data-id=\"a2bef7b\" 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=\"800\" height=\"450\" src=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/passage-camera.webp\" class=\"attachment-large size-large wp-image-1018969\" alt=\"cam\u00e9ra dans bassin\" srcset=\"https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/passage-camera.webp 1024w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/passage-camera-300x169.webp 300w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/passage-camera-768x432.webp 768w, https:\/\/www.nidaplast.com\/wp-content\/uploads\/2026\/08\/passage-camera-600x338.webp 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\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-d599441 elementor-widget elementor-widget-heading\" data-id=\"d599441\" 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\">2. Removal of sludge and deposits<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9caf1c8 elementor-widget elementor-widget-text-editor\" data-id=\"9caf1c8\" 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 class=\"isSelectedEnd\">Accumulated sediment and sludge are removed using a vacuum tanker or other suitable equipment. Particular attention should be paid to settlement areas, access chambers, pre-treatment systems and low points.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f40ba09 elementor-widget elementor-widget-heading\" data-id=\"f40ba09\" 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\">3. Hydro-jetting of pipes<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-043c4e9 elementor-widget elementor-widget-text-editor\" data-id=\"043c4e9\" 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 class=\"isSelectedEnd\">Pressurised water jets are used to dislodge deposits from pipe walls and move them towards a location where they can be removed by suction. Network accessibility is therefore an important consideration from the design stage onwards.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a1d00e elementor-widget elementor-widget-heading\" data-id=\"4a1d00e\" 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\">4. Post-cleaning inspection<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-873f08d elementor-widget elementor-widget-text-editor\" data-id=\"873f08d\" 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 class=\"isSelectedEnd\">After cleaning, pipes, access chambers and equipment are checked to identify any damage, remaining obstruction or other anomaly.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01d4b0d elementor-widget elementor-widget-heading\" data-id=\"01d4b0d\" 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\">5. Waste removal and traceability<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8f4248b elementor-widget elementor-widget-text-editor\" data-id=\"8f4248b\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"9678\" data-end=\"9805\"><strong data-start=\"9678\" data-end=\"9805\">Extracted materials must be characterised and sent to an appropriate treatment or disposal route according to their nature.<\/strong><\/p><p data-start=\"9807\" data-end=\"10007\">Where extracted material is classified as <strong data-start=\"9849\" data-end=\"9868\">hazardous waste<\/strong>, particularly where hydrocarbons are present, its handling and traceability must comply with the waste regulations applicable to the site.<\/p><p data-start=\"10009\" data-end=\"10132\">Records relating to maintenance operations and waste removal should be retained in accordance with applicable requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad71cc7 elementor-widget elementor-widget-heading\" data-id=\"ad71cc7\" 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\">How should the basin's flow control devices be inspected?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c6cd0e elementor-widget elementor-widget-text-editor\" data-id=\"6c6cd0e\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"10202\" data-end=\"10406\"><strong data-start=\"10202\" data-end=\"10406\">Even a thoroughly cleaned basin can fail to operate correctly if its flow control system is blocked or damaged. Checking the discharge flow control system is therefore an integral part of maintenance.<\/strong><\/p><p data-start=\"10408\" data-end=\"10431\">Inspection can include:<\/p><ul data-start=\"10433\" data-end=\"10584\"><li data-section-id=\"iossb3\" data-start=\"10433\" data-end=\"10467\"><strong data-start=\"10435\" data-end=\"10466\">vortex flow control devices<\/strong>;<\/li><li data-section-id=\"2we7a6\" data-start=\"10468\" data-end=\"10494\"><strong data-start=\"10470\" data-end=\"10493\">calibrated orifices<\/strong>;<\/li><li data-section-id=\"1sbds5k\" data-start=\"10495\" data-end=\"10508\"><strong data-start=\"10497\" data-end=\"10507\">valves<\/strong>;<\/li><li data-section-id=\"10407hb\" data-start=\"10509\" data-end=\"10524\">outlet pipes;<\/li><li data-section-id=\"zegk2v\" data-start=\"10525\" data-end=\"10549\">flow control chambers;<\/li><li data-section-id=\"3njiqu\" data-start=\"10550\" data-end=\"10584\">non-return devices where fitted.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a17ecc elementor-widget elementor-widget-heading\" data-id=\"5a17ecc\" 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\">Why should maintenance be considered at the stormwater basin design stage?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-edb465d elementor-widget elementor-widget-text-editor\" data-id=\"edb465d\" 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 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"10671\" data-end=\"10944\"><strong data-start=\"10671\" data-end=\"10803\">A stormwater basin is easier and less costly to maintain when access to its equipment has been considered from the design stage.<\/strong> Access chambers, inspection possibilities, accessible settlement areas and network layout all directly affect future maintenance operations.<\/p><p data-start=\"10946\" data-end=\"11075\">This is particularly important for <strong data-start=\"10981\" data-end=\"11014\">underground stormwater basins<\/strong>, where equipment cannot be directly viewed from the surface.<\/p><p data-start=\"11077\" data-end=\"11105\">The objective is to provide:<\/p><ul data-start=\"11107\" data-end=\"11365\"><li data-section-id=\"1l14cce\" data-start=\"11107\" data-end=\"11165\">inspection access to the different levels of the system;<\/li><li data-section-id=\"19lqk6h\" data-start=\"11166\" data-end=\"11214\">access to areas where sediment may accumulate;<\/li><li data-section-id=\"u6hf3g\" data-start=\"11215\" data-end=\"11252\">access for hydro-jetting equipment;<\/li><li data-section-id=\"1crkgzd\" data-start=\"11253\" data-end=\"11284\">the ability to remove sludge;<\/li><li data-section-id=\"rb1aff\" data-start=\"11285\" data-end=\"11331\">access to inlets and outlets for inspection;<\/li><li data-section-id=\"q7bdnr\" data-start=\"11332\" data-end=\"11365\">access to flow control devices.<\/li><\/ul><div>\u00a0<\/div><p data-start=\"11367\" data-end=\"11480\"><strong data-start=\"11367\" data-end=\"11480\">See our complete guide to stormwater attenuation basins to consider these requirements from the design stage.<\/strong><\/p><p data-start=\"11482\" data-end=\"11700\">A maintenance plan combined with a design that allows inspection and cleaning therefore helps preserve <strong data-start=\"11585\" data-end=\"11700\">effective storage volume, discharge flow control and water quality throughout the operating life of the system.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cac943b elementor-widget elementor-widget-text-editor\" data-id=\"cac943b\" 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 class=\"isSelectedEnd\"><b>Sources et References :\u00a0<\/b><\/p><ul><li data-section-id=\"1r54ydu\" data-start=\"97\" data-end=\"508\"><a href=\"https:\/\/knowledge.bsigroup.com\/products\/separator-systems-for-light-liquids-e-g-oil-and-petrol-selection-of-nominal-size-installation-operation-and-maintenance\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"99\" data-end=\"186\">BSI \u2013 BS EN 858-2:2003 \u2013 Separator systems for light liquids (e.g. oil and petrol):<\/strong> <\/a>British Standard covering the selection of nominal size, installation, operation and maintenance of separator systems for light liquids such as oil and petrol.<\/li><li data-section-id=\"1r54ydu\" data-start=\"97\" data-end=\"508\"><a href=\"https:\/\/www.gov.uk\/government\/publications\/waste-duty-of-care-code-of-practice\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"512\" data-end=\"583\">GOV.UK \/ Environment Agency \u2013 Waste duty of care: code of practice:<\/strong><\/a> Official guidance on the legal responsibilities for managing, storing, transferring and documenting controlled waste in England and Wales.<\/li><li data-section-id=\"1r54ydu\" data-start=\"97\" data-end=\"508\"><a href=\"https:\/\/www.gov.uk\/government\/publications\/waste-classification-technical-guidance\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"807\" data-end=\"878\">Environment Agency \u2013 Waste classification technical guidance (WM3):<\/strong><\/a> Technical guidance for the classification and assessment of waste, including the identification of hazardous waste and the properties that determine how it must be managed.<\/li><li data-section-id=\"1r54ydu\" data-start=\"97\" data-end=\"508\"><a href=\"https:\/\/www.gov.uk\/government\/collections\/classify-different-types-of-waste\" target=\"_blank\" rel=\"noopener\"><strong data-start=\"1140\" data-end=\"1207\">Environment Agency \/ DEFRA \u2013 Classify different types of waste:<\/strong> <\/a>Official guidance and resources for identifying and classifying different waste streams, including hazardous and oil-contaminated waste.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a9c97de elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"a9c97de\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-caa60d1 e-flex e-con-boxed e-con e-parent\" data-id=\"caa60d1\" 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-b4679da elementor-widget elementor-widget-text-editor\" data-id=\"b4679da\" 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><strong>Would you like support with the development of your project?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5f43a03 e-grid e-con-full e-con e-child\" data-id=\"5f43a03\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9598d52 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"9598d52\" 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\/contact\/\">\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\">Request a technical study<\/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\t\t<div class=\"elementor-element elementor-element-120f19a elementor-align-center elementor-widget elementor-widget-button\" data-id=\"120f19a\" 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:\/\/hubs.ly\/Q04pChRw0\" target=\"_blank\" rel=\"noopener\">\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\">Download the Nidaplast catalogue<\/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\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>Maintaining a stormwater basin helps preserve its effective storage volume, hydraulic performance and the quality of discharged water. The gradual accumulation of total suspended solids (TSS), sediment and debris can reduce storage capacity, cause blockages and affect the flow control system. Where stormwater is potentially polluted, maintaining pre-treatment systems also helps limit the transfer of [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":1018899,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[391],"tags":[],"univers":[],"class_list":["post-1045414","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment-and-sustainable-development"],"acf":[],"permalink_manager":null,"_links":{"self":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/1045414","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"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/comments?post=1045414"}],"version-history":[{"count":5,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/1045414\/revisions"}],"predecessor-version":[{"id":1045623,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/posts\/1045414\/revisions\/1045623"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media\/1018899"}],"wp:attachment":[{"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/media?parent=1045414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/categories?post=1045414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/tags?post=1045414"},{"taxonomy":"univers","embeddable":true,"href":"https:\/\/www.nidaplast.com\/en\/wp-json\/wp\/v2\/univers?post=1045414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}