Pasadena Biodiversity Trail
A chain of WSUD Assets in Mitcham
Treatment Train
This project involved 'daylighting' 2 stormwater pipes - bringing them to the surface in a reserve, then connecting to further reserves via an under-road culvert. A large catchment with a steep gradient makes for high intensity flows.
Detention Basin
Water first exits the pipe here and spills into rock in the base of this detention basin. Once the full capacity of the basin is reached, there is a small pipe culvert taking water to the downstream features. In a very high flow event, the water is allowed to make its way over a high-flow overpass to the side
Rock lined swales
This project features a number of rock lined and vegetated swales - slowing the flow of water, allowing for water and nutrient uptake and natural filtration
Culverts
Water which does not infiltrate the soils is allowed to pass further downstream via culverts under paths and the roads
Cleansing
Sediments are taken out of the stormwater in the upstream features, but more rock has been used here to slow and filter out any more sediments so they don't flow downstream
Integration
This project won awards for design and construction because it achieved so many positive outcomes for the community. One of them was upgrading the playground and then introducing nature-play elements along the swale corridor
Greening, Cooling & Biodiversity
Data was taken before the project which demonstrated dry and very hot environments, with minimal green. With the combination of infiltration through the swale and also numerous soakage trenches which now thread amongst the trees, recent data shows significantly cooler and greener environments, and all the new plants and healthy trees are boosting biodiversity
Next Stage Soon
The swale system terminates here and then will pick-up on the other side of the adjacent road, where there will be built a large detention basin serving additional catchment from neighbouring streets
