Raingardens are self-watering, low maintenance gardens. They capture stormwater that runs off hard surfaces after it rains and clean the water before it is reused or released into creeks, rivers and waterways.

How do raingardens work?

Beneath the raingarden are layers of sandy soil which help to clean the water and slow the rate of stormwater entering our rivers and creeks. The layers assist in the removal of pollution, such as nitrogen and phosphorus, fertilisers, dust, leaves and animal droppings, which are washed off these hard surfaces.

Over time particles can clog the raingarden. A layer of spherical particles of diameter D will prevent the passage of spherical particles of diameter D/6. Once this layer forms spherical particles of D/36 is retained.

StormTech arches are ideal for raingarden applications. One of the key advantages of the StormTech arch or chamber system is design flexibility. StormTech chambers can be configured into beds or trenches, in centralised or decentralised layouts to fit on nearly any site.

We can provide oil separators and gross pollutant traps to meet your raingarden requirements. This will remove 96 per cent of TSS, 45 per cent of Nitrogen and 45 per cent of Phosphorous.

Using StormTech chambers with an Isolator row will alleviate blocking inside the raingarden. An overflow bypass will allow water to continue entering the soil. Isolator rows can be jetted clean via their access points. Jetting removes the layers of retained particles that clog. The plants in raingardens help to further filter out pollution that would otherwise end up in our rivers and creeks.

By capturing stormwater, raingardens can be self watering and are therefore easier to maintain.