Development Application part 2 Report/Plans - MCU11/0254

SWMP-Lot 4 Hofmann Drive, Noosaville                                                         8




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.