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Effective stormwater management
Stormwater management is about controlling the rain that falls on a site so it leaves the site safely, without flooding the property, the neighbours or the street, and without carrying pollutants into the waterways downstream.
The elements of a good design
- Collection: roof and surface drainage sized for the design storm, with gutters, downpipes, pits and pipes that do not surcharge.
- Conveyance: a piped or overland path to a lawful point of discharge, usually the street kerb, a council pipe or an inter-allotment easement.
- Detention: on-site stormwater detention (OSD) that holds back the peak flow so the development does not increase runoff to the council system.
- Water quality: measures such as rain gardens, filters or tanks where the council requires treatment before discharge.
- Reuse: rainwater tanks for irrigation, toilets and laundry, which also help meet BASIX targets on residential projects.
Why it matters for approval
Every Sydney council has an engineering specification that sets the design storm, the OSD requirements and the drawing standard it expects. A drainage design prepared to that specification, and to the Australian Rainfall and Runoff guidelines, moves through assessment without the back-and-forth that delays a DA.
Need an assessment or a design? Request a quote or call 02 9756 1211.