{"id":29400,"date":"2022-10-01T09:36:12","date_gmt":"2022-09-30T23:36:12","guid":{"rendered":"https:\/\/atlanstormwater.com\/au\/2022\/10\/01\/bioretention-layers-finding-a-balance\/"},"modified":"2026-01-20T13:41:40","modified_gmt":"2026-01-20T03:41:40","slug":"bioretention-layers-finding-a-balance","status":"publish","type":"post","link":"https:\/\/atlanstormwater.com\/au\/bioretention-layers-finding-a-balance\/","title":{"rendered":"Bioretention Layers: Finding a Balance"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"29400\" class=\"elementor elementor-29400\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-76551fcb elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"76551fcb\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fa3f943\" data-id=\"fa3f943\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e7c7dd2 elementor-widget elementor-widget-text-editor\" data-id=\"e7c7dd2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-32958 size-full\" src=\"https:\/\/atlanstormwater.com\/wp-content\/uploads\/sites\/2\/2023\/01\/Spel-Bioretention-layer-diagram.jpg\" alt=\"\" width=\"1023\" height=\"711\" srcset=\"https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2023\/01\/Spel-Bioretention-layer-diagram.jpg 1023w, https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2023\/01\/Spel-Bioretention-layer-diagram-300x209.jpg 300w, https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2023\/01\/Spel-Bioretention-layer-diagram-768x534.jpg 768w\" sizes=\"(max-width: 1023px) 100vw, 1023px\" \/><\/p>\n<p>Naturalised systems bridge the gap between our urban spaces and nature &#8211; and bioretention is a fundamental part of modern stormwater designs, green infrastructure, and sustainable assets.<\/p>\n<p>Bioretention media mimics the infiltration properties of our natural green space and supports plant growth, stormwater treatment, and water retention. It slows flows of stormwater runoff that travel through our urban areas and mitigates flooding in surrounding areas.<\/p>\n<p>Our engineered bioretention media is formulated from high-quality sandy loam, MRTS Form G compost, and gravel, and sown with plants selected for their pollution removal qualities. Appropriately graded and standardized, the components of quality bioretention mediums are engineered to meet requirements for hydraulic conductivity, plant growth, filtration, and fast drainage.<\/p>\n<p>SPELBio is engineered to tick these boxes and ensure that your green infrastructure is underpinned by high-performance bioretention.<\/p>\n<h3>Bioretention: Designing the Layers Below<\/h3>\n<p><strong>Ponding Layer<\/strong><\/p>\n<p>Bioretention basins are often designed to hold water in a ponding layer, which allows it to slowly infiltrate. Overflow outlets allow excess water to drain directly in case of a large storm or flood, and ponding layers can be exchanged for extended detention.<\/p>\n<p><strong>Maintenance:<\/strong> Occasional overflow maintenance after rain events, particularly if the basin is not draining.<\/p>\n<p><strong>Mulch Layer<\/strong><\/p>\n<p>Mulch forms a protective layer that supplies very coarse filtration, stops the germination of weed species, and protects the biofiltration media beneath. It helps soils to retain water and captures sediment and debris. As mulch breaks down, it creates organic matter that helps support plants and bioorganisms.<\/p>\n<p><strong>Maintenance:<\/strong> Mulch replacement. Remove germinating weed species.<\/p>\n<p><strong>Plants<\/strong><\/p>\n<p>Healthy plants are essential to water quality and infiltration! The biological processes of plants sequester pollution and uptake nutrients. Their root systems create voids in the underlying media, which allow water to \u2018soak\u2019 through.<\/p>\n<p><strong>Maintenance:<\/strong> Watering &amp; general plant care. Weeding and removal of pest species.<\/p>\n<p><strong>Biofiltration media layer<\/strong><\/p>\n<p>This porous media is a mixture of sand, MRTS Form G compost and fines (clay or silt), and acts as a growing media for plants and a filtration media for stormwater. Engineered to meet hydraulic specifications, it is designed to retain water and allow it to slowly percolate and drip through.<\/p>\n<p><strong>Maintenance:<\/strong> Replacement of media after prolonged ponding.<\/p>\n<p><strong>Transition Layer<\/strong><\/p>\n<p>The transition layer is a layer of sand that stops the filter media from being transported into the drainage layer.<\/p>\n<p><strong>Drainage Layer<\/strong><\/p>\n<p>The drainage layer, typically aggregate, ensures that water can move from the bioretention into surrounding soils and nearby drainage pipes. This helps to prevent the water from saturating the bottom layers for extended periods \u2013 and the layer is sized appropriately for flow rates and catchment volume.<\/p>\n<p><strong>Maintenance:<\/strong> Assessment of water conveyance and ponding.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-db97e3d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"db97e3d\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-348434f\" data-id=\"348434f\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-b3f8ad5 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b3f8ad5\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-ffe2af3\" data-id=\"ffe2af3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9c70a29 elementor-widget elementor-widget-image\" data-id=\"9c70a29\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2022\/12\/TheFlow-Issue7-1024x682.jpg\" class=\"attachment-large size-large wp-image-31226\" alt=\"\" srcset=\"https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2022\/12\/TheFlow-Issue7-1024x682.jpg 1024w, https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2022\/12\/TheFlow-Issue7-300x200.jpg 300w, https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2022\/12\/TheFlow-Issue7-768x512.jpg 768w, https:\/\/atlanstormwater.com\/au\/wp-content\/uploads\/sites\/2\/2022\/12\/TheFlow-Issue7.jpg 1400w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\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\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-4596935\" data-id=\"4596935\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f33f718 elementor-widget elementor-widget-heading\" data-id=\"f33f718\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Enjoy this article?<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-45277ab elementor-widget elementor-widget-text-editor\" data-id=\"45277ab\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Read and share more articles from The Flow Issue #7.<\/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-0ad806e elementor-widget elementor-widget-button\" data-id=\"0ad806e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/atlanstormwater.com\/au\/category\/spel-flow-magazine\/the-flow-issue-7\/\">\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\">BROWSE ARTICLES<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Naturalised systems bridge the gap between our urban spaces and nature &#8211; and bioretention is a fundamental part of modern stormwater designs, green infrastructure, and sustainable assets. Bioretention media mimics the infiltration properties of our natural green space and supports plant growth, stormwater treatment, and water retention. It slows flows of stormwater runoff that travel [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":32992,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[313,312,323],"tags":[],"class_list":["post-29400","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-atlanbio","category-spel-flow-magazine","category-the-flow-issue-7"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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