A WSUD pilot project under the EPA Catchment to Coast program, the Randolph Avenue landscape design incorporates a pathway along the southern side of the street, landscaped garden beds, the replacement of existing mature elms that were in poor health, additional green space for residents, biofiltration raingardens to improve stormwater quality, and stormwater infiltration wells to facilitate passive infiltration of the adjacent trees and garden beds.
This project is a pilot with part funding from the Catchment to Coast project being led by the EPA with funding from the National Landcare Programme ($250,000), to demonstrate action that can be taken at a street level to improve urban water quality and the quality of Adelaide’s coastal waters
WSUD features
Bioretention – raingardens
- 10 raingardens of dimensions 1.70-2.10 m wide with a variety of lengths ranging from 6.75‑25.5 m
- Total length of raingarden is 146 m, giving a total treatment area of 245 m2 (0.5% of contributing catchment)
- A saturated zone of 450 mm depth to assist plant viability and storage capacity
- A design infiltration rate of 160 mm per hour through filter media
- HDPE lined system with no exfiltration
Stormwater infiltration wells
- 31 infiltration wells of dimensions 600 mm x 400 mm x 450 mm deep
- Waterproof membrane top and bottom with geofrabric and 20 mm screenings around the perimeter, providing lateral infiltration to adjacent trees and garden beds
Case Study: Randolph Avenue – 10 February 2016 – downloadable .pdf file
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