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Streisand Dr and Saturn Crt Stormwater Gardens

Streisand Dr, Saturn Crt, Mcdowall
Date Constructed:2006
Site#:0009
Project Summary: Stormwater Garden Retrofit
A stormwater garden is an element of WSUD that captures stormwater from the road in a recessed garden bed. This slows the flow rate, allowing the water to infiltrate vertically through the garden where it is filtered and cleaned by natural environmental processes (eg. soil filtration). The clean water is then allowed to flow into the waterways and to Moreton Bay. The stormwater gardens were retrofitted in residential locations on relatively flat graded sites in McDowall and Bridgeman Downs. The treatment area of the stormwater gardens were 20m2, approximately 2% of the catchment area. Catchment sizes for the stormwater gardens are approximately 0.1 hectares each.  
Key Features:  
Stormwater 
Runoff from the road is diverted into the stormwater garden; the inlet reduces the velocity of the stormwater entering the stormwater garden with the use of encased rocks.
The stormwater is detained in the stormwater garden to promote settling of sediments. The stormwater gardens are planted with shrubs, which aid in reducing stormwater velocity, spread the stormwater flow across the garden bed and assist in the infiltration of stormwater through the garden.
Stormwater gardens also assist in the biological uptake of nutrients in the stormwater. The stormwater gardens use a sandy soil to promote infiltration, which is then discharged via underground pipes to the local creek and eventually to Moreton Bay.
Excess stormwater is diverted around the stormwater garden into a conventional stormwater gully pit.
Water Efficiency 
No re-use of stormwater from the stormwater garden occurs.
Performance Monitoring and Evaluation 
Brisbane City Council is currently undertaking water quality and performance monitoring of these devices.
What Worked Well? 
The stormwater gardens are cheap to construct in a relatively short time frame when compared to other treatment devices.
Longer-term maintenance will be reduced to a standard for sediment clean out.
The stormwater gardens are aesthetically pleasing with the streetscape enhanced. Local residents are pleased with the outcome.
What Were The Challenges? 
Some difficulties in plant establishment along the top of the batter slopes was encountered.
Ideal sites difficult to find with the correct slope, some potential sites had landscape features or driveways constructed through the build outs.
Construction of the stormwater garden included digging around underground services previously installed.
Address:
Streisand Dr, Saturn Crt Mcdowall
Map 118 P6 and Map 118 N8

Contact:
Brisbane City Council
Water Resources Branch (07) 3403 8888

Local Government Area:
Brisbane City Council

Developer/owner:
Brisbane City Council

Status and/or Timelines
Construction October 2006