Everything You Should Know About Bioretention Systems

24 May 2021

Stormwater is known to be one of the most common sources of pollution in urban areas. With the presence of undeveloped areas, the stormwater will seamlessly pick up pollutants along the way until it reaches the primary waterways. As the stormwater continues to accumulate, many waterways will be bombarded with harmful elements that can cause health issues to people as well as harm the ecosystem. Stormwater can likewise cause flood and damage structures and properties.

The absence of any stormwater runoff control can impact humans and the environment as it can inevitably cause huge floods, eroded streambanks, widened stream channels, destruction of natural habitat, impaired recreational sites, contamination of water, and increased water and wastewater treatment expenses. Major aspects of tourism and other businesses can also be affected by this problem.

Bioretention System as the Main Solution

Fortunately, stormwater runoffs can be effectively mitigated and processed by bioretention systems. These systems are primarily comprised of soil bed that is planted with non-invasive vegetation. The soil bed of these systems is designed to naturally filter the stormwater. With the existence of vegetation, most pollutants are expected to be removed from the water before transferring it to another area.

Aside from the removal of pollutants, the vegetation plays another important role in the systems since it can provide a substrate for the growth of biofilm that is needed by other parts of the system. It can likewise sustain the pores that can be found on the system. Working alongside the vegetation is the pipes that are found underneath the bioretention systems. These pipes are designed to collect filtered stormwater and send them to the stormwater systems, natural waterways, or detention basins.

Various Types of Bioretention Systems

To date, there are three types of bioretention systems that can be utilised.

One type of bioretention system is the street tree bioretention pit. This specific type of bioretention system is often integrated into the street tree landscaping, allowing it to receive overland water flow from nearby street areas. A bioretention basin, on the other hand, is another type of bioretention system that maximises stormwater treatment to effectively process stormwater. This type of bioretention system allows water to temporarily accumulate in the basic before sending it to the vegetation and filter media. 

The last type of bioretention system is the bioretention swale. It also has a stormwater treatment system, with the addition of conveyance functions. A bioretention swale removes coarse and medium sediments from the stormwater at the top while the bioretention system eradicates finer particles at the base.

Notable Benefits of Bioretention Systems

What is great about bioretention systems is that they typically cost a lot cheaper compared to other treatment systems. Additionally, they can effectively work with different types of climate, soil, and groundwater. Even the type of elements that the systems can remove is more expansive than the elements that can be removed by other proprietary treatment systems. 

With the integration of bioretention systems to specific places, the habitat of wildlife can be saved significantly. These systems can likewise bring comfort to people as healthy green spaces can be achieved. Ultimately, flash flooding will be prevented with the presence of these systems.

To learn more about these systems, just call us at Fairdinkum Technical Services.

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