What is on-site detention?
On-site detention (OSD) provides temporary storage of stormwater runoff from a property and restricts the discharge from the site to a rate at which Councils existing drainage system can accommodate. The aim of OSD is to ensure that the amounts of stormwater runoff doesn’t increase as a result of any development on the site, thus reducing the chance of flooding downstream. Examples of OSD include car parks, driveways, landscaped areas, underground tanks and pits.