OSD Tanks – Onsite Stormwater Detention

OSD tanks are onsite stormwater detention tanks that detain stormwater from your site to ensure development areas are safely drained. It’s a storage tank with a slow-release system to council kerb or street systems. The reason for their use is to improve drainage and environmental issues and to avoid flooding.

OSD tank diagram

Many councils in NSW are requiring new property owners to provide a OSD system. This is to capture rainwater on their property and release it at a slower rate than it would normally do.

You must regularly maintain your OSD system to prevent potential problems. This helps ensure that during a storm event, the tank will function as designed. If your OSD system discharges directly into a Sydney Water owned drainage system or your local Council requires annual reporting, you must enter into a formal service agreement which sets out your ongoing OSD maintenance responsibilities.

Contact Stormwater Sydney if your property has either above or below ground stormwater tanks. We will organise a maintenance schedule to ensure your assets work as designed and you meet reporting and maintenance requirements. Check out one of our past OSD projects in this Article.

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