Bio Retention

Bio retention utilises growing media and plants (both woody and herbaceous) to remove pollutants from stormwater run-off.

When large-scale infiltration and harvesting are not practical, bio retention can provide a high level of treatment and partial run-off reduction capability above and beyond tradition designs.

Pollution from roadways, footpaths, parks and developments are transported in stormwater run-off and is proven to be a major source of waterway contamination. Gross pollutants, Hydrocarbons and oils, nutrients in both dissolved and particulate form including organic waste and suspended solids can get caught up in storm water, wash into drains, etc.

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What Is Bioretention?

Bioretention, otherwise known as a raingarden, utilises filtration media with plants (both woody and herbaceous) to remove pollutants from stormwater run-off. When space is available on site, or proprietary filtration systems such as cartridge devices or membrane filtration systems are not practical, bioretention can provide a high level of treatment together with run-off reduction capability.
Prior to the filtration process within the bioretention system, stormwater typically runoff, firstly enters a sedimentation fore bay or passes through an energy dissipater to drop out larger sediment loads. Flow then continues into the filtration area where it can build up in the extended detention zone above the filtration media. Stormwater percolates through the bioretention media where physical, chemical and biological treatment takes place usually at a low hydraulic conductivity or specific flow rate. Some proprietary systems or micro high flow rate bioretention systems, as the name suggests, have a higher hydraulic conductivity via a specifically designed media blend to achieve similar levels of pollutant reductions. As the stormwater passes through the media layer both the flow and volume of stormwater leaving the media via the transition or drainage layer is reduced thus decreasing the resultant hydraulic load.
By the time the storm water exits the bioretention or raingarden system, much of the pollution has been removed from the stormwater runoff which is then discharged to the downstream waterway.

How can Bioretention help your development?

Conventional bioretention or proprietary high flow bioretention systems are designed meet the stormwater quality objectives prescribed by local government authorities. They can also provide aesthetic value and satisfy the local authorities minimum landscaped or pervious requirements provided that the land take or space is available. A well designed and integrated Bioretention system can also provide habitat for local fauna and promote biodiversity and help soften the visual aspect of the built environment.
Want to know more about what bioretention is or how it can help your business? Contact us to learn more.