Urban Water » Resources » Stormwater treatment types » Raingarden tree pits

Raingarden tree pits

Each raingarden tree pit works like a small raingarden. When it rains, stormwater runs off road surfaces and into the gutters.

Raingarden tree pits are set into the kerb and intercept and clean the water before it goes into the drain.

The pit contains layers of substrate that work with the tree’s root system to filter pollution from the stormwater. This includes nitrogen, phosphorus and oils.

Tree pits also include a rock mulch layer to retain moisture in the soil and prevent erosion during rain.

A grate sits around the base of the tree, flush with the pavement. This protects the tree pit from damage and ensures that pedestrians don’t trip over it.

A pipe is located at the bottom of the well. It allows cleaned stormwater to drain back into the drainage system.

 

Water is diverted from the gutter an into the raingarden tree pit.

Water is diverted from the gutter an into the raingarden tree pit.

We have over 200 raingarden tree pits in the City of Melbourne

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with the State Government of Victoria
This website was delivered in partnership with the State Government of Victoria