Information Response - Email 1 of 2 MCU16/0153 & REC16/0041

                                   STORMWATER MANAGEMENT PLAN
Client: Thomco (No 2087) Pty Ltd                          Location: 215 David Low Way, Peregian Beach


5.0 STORMWATER QUANTITY
As the development proposes to increase the amount of impervious areas when compared to the
existing site condition, the development will result in an increase in stormwater peak flows.
The proposed stormwater quantity management for this site ensures no actionable nuisance occurs
due to development of the site. The proposed arrangement also ensures that the receiving
environment will not be detrimentally affected by the increased flows.

5.1 Receiving Environment
The site discharges directly to a Council Reserve to the west then to the Emu Swamp section of the
Noosa National Park beyond. The topography of the area would be described as extremely flat with
no defined creek within approximately 550m. Due to flat topography, heavy vegetation and the
distance from a defined creek, this environment is considered to be at very low risk of erosion.

In addition to the natural attributes of the receiving environment, the discharge point from the site is
approximately 1,000m upstream of the nearest drainage infrastructure. This infrastructure is a
culvert, of unknown size, under a gravel section of Woodland Dve which is not accessible to the
public (refer Figure 4). This infrastructure, considering the topography and being such a distance
downstream of the discharge point, would experience a negligible change in flows from the
development of this site.




                Approximate Flow
                   Path From
                Development Site
                to Woodland Dve
                     Culvert




                                             Development
                                                 Site



Figure 4 - Flow Path to Woodland Dve (source: Google Earth)


5.2 Pre/post Developed Flows
The proposed development will increase the impervious area of the site from 870m2 to 8,154m2. This
increase in impervious area will result in an increase in the peak stormwater runoff from the site.
Rational calculations have been carried out to provide an indication of the expected increase in peak


Covey Associates Pty Ltd                           10                                  Project No: 162042
Consulting Engineers                                                                    100949Rpt Issue B