Project Details
As part of the Urban Forest Plan Infill Street Tree Planting Program the City of Perth has designed and installed a range of innovative and bespoke water retention tree pits across the city.
WSUD Category: Tree pits
| Criteria | Information |
|---|---|
| Development Type: | Infrastructure |
| Function/Driver: | Water quality |
| Government Area: | City of Perth |
| Site Context: | Well-draining soils |
| Year Completed: | 2020 |
Overview
As part of the Urban Forest Plan Infill Street Tree Planting Program the City of Perth has designed and installed a range of innovative and bespoke water retention tree pits across the city.
Each pit is designed to capture and filter stormwater run off from city streets to improve water quality and promote a sustainable approach to water management within the urban forest.
The pits help deliver additional water to our street trees. This promotes the development of large and healthy tree canopies which cool the city and creates green, shaded and attractive city streets.
Design Details
- These pits are generally used in high profile public realm projects in central city areas with high levels of pedestrian movement and activity. They support the growth of large trees with healthy and dense canopies which contribute to the creation of cool and welcoming spaces for people. They have been successfully installed in a number of locations across Central Perth including St Georges Terrace, Museum Street and Hay Street East.
- A series of geogrids are placed around the tree pit, on a bed of compacted crushed rock, and anchored in. A planting soil mix is used to fill the structural cells, matching the soil used in the tree-pit. The grids are overlaid with street pavers on a compacted base and geotextile layer.
- The creation of non compacted soil volumes to support healthy tree root growth also allows water to percolate through to the roots and helps to improve soil moisture content.
Contact Officer: Barbara Meldrum