Technical Solutions · Stormwater
OSD tanks and stormwater detention for Australia
Modular EcoBloc detention, infiltration and treatment configured for Australian council and WSUD requirements.
Civil & commercial stormwater - WSUD detention and treatment
GRAF Treatment Mako Shark sedimentation plant
Process
Stormwater treatment train
Civil runoff is treated through GRAF Treatment Mako Shark sedimentation, then managed with GRAF EcoBloc detention, infiltration or controlled discharge.
- 1Roof, pavement and civil catchment - runoff from impervious site areas
- 2GRAF Treatment Mako Shark - sedimentation and filtration at the treatment inlet
- 3GRAF EcoBloc Inspect modular cells - underground detention, infiltration or retention
- 4Treated flow to council-approved discharge point or soakaway infiltration
Also in this system
In short
GRAF Australia supplies EcoBloc modular crates and Carat/Platin detention tanks for Australian OSD, infiltration and WSUD projects. Confirm the planning condition, size with your civil engineer, then quote through grafaustralia.com.au or 1300 131 971. Read the OSD tank guide for diagrams and product comparisons.
When to specify
Typical Australian applications
- On-site detention required by council or WSUD guidelines
- Infiltration where soil and groundwater conditions allow
- Civil and landscape projects needing load-rated underground storage
Product paths
Open the catalogue by system type
FAQ
OSD and detention questions
Short answers for Australian council OSD briefs. Full diagrams and comparisons live in the project guide.
What is an OSD tank?+
An OSD tank (on-site detention) temporarily stores stormwater runoff and releases it at a controlled rate so developments meet council peak-flow limits. GRAF Australia supplies EcoBloc modular crates and Carat/Platin detention tanks for Australian OSD projects.
EcoBloc vs detention tank: which should I use?+
EcoBloc builds modular underground volume under pavement or landscape with inspectable options. Carat and Platin detention tanks suit vessel-style briefs. Choice depends on footprint, cover depth, load class and maintenance access. GRAF Australia can compare options for your civil design.
Is stormwater detention the same as rainwater harvesting?+
No. Detention controls discharge rates to meet OSD or WSUD rules. Rainwater tanks store water for reuse. Some sites need both. Confirm the planning condition before you specify products.
How do I size stormwater detention in Australia?+
Sizing follows catchment area, rainfall intensity, permitted site discharge and the local council OSD policy. Use the GRAF Australia OSD design tool for a first pass, then engage your civil engineer and request a product quote.
Size a detention system
Share site area, impervious coverage and council requirements. We will recommend the EcoBloc or detention tank configuration.