SC3395-SWMP Rev A

SC3395-Lot 4 Hofmann Drive, Noosaville                                                                   11




4.0 Stormwater Quantity Management

The subject site is located adjacent to an environmental wetland reserve. Site inspections of the adjacent
stormwater infrastructure within the Hofmann Drive road reserve identified that captured water from the
local upstream catchment is directed to this wetland. As the wetland is under the control of a local statutory
authority, it is deemed to be the legal point of discharge for the subject site. As such all captured
stormwater from the site is proposed to be discharged to the wetland via the overflow outlet from the
proposed bio-filtration device.


The location of the site relative to the upstream urbanised catchment is at the downstream end of the
network and adjacent to the point of discharge. In addition, the time of concentration for the subject site is
much less than that of the total catchment area hence relief of the site occurs well before the upstream
catchment reaches its peak discharge. With these points being considered, it has been determined that on-
site detention would have no beneficial impact to peak flow discharge rates and as such no detention is
proposed within the development.