Residential Extensions in Penshurst: What is an OSD and how to take that into consideration?
Changes in land use for urban development generally increase stormwater run-off. Building hard surfaces such as pavements, roofs and site drainage increase the volume and speed of stormwater run-off. They also reduce the capacity of stormwater to soak into the ground. As the capacity of existing stormwater drainage systems is limited, if you’re building or developing a new property you may need to provide on-site stormwater detention (OSD) systems to ensure that stormwater run-off does not increase flooding downstream of your development. On-site stormwater detention provides temporary storage of stormwater run-off. This means the run-off rate and volume can be controlled to ensure the receiving system is not overloaded. The required size of storage and rate of discharge vary depending on the location, size and subsequent impact of your development.