Swmp

               Note: Some authorities may not accept a written approval from a current landowner
               because a subsequent purchaser will not be bound by the previous owner’s letter or
               contract (refer to Section 3.10)


The lawful points of discharge for the site are the Sidoni Street or Blakesley Street kerb and channel or
the existing stormwater side entry pit located at the front of the site. The proposed lawful point of
discharge is considered to be compliant with the criteria outlined in QUDM 2017 see below: -

         1.    The proposed development stormwater discharge will not alter the existing site’s
               stormwater discharge characteristics.
         2.    The location of the proposed discharge point is under the lawful control of the local
               government.
         3.    Authority to discharge over affected properties will not be required as the proposed
               development will discharge to Council’s stormwater network.




5.0      STORMWATER QUALITY:
In the absence of adequate controls, urban development can increase both stormwater runoff volumes
and peak discharge rates. In addition, this urban development has the potential for increased creek
erosion and the stressing of in-stream aquatic ecosystems. The use of stormwater detention or
retention systems aims at reducing these threats by limiting property flooding to acceptable levels and
also filtering stormwater runoff through a vegetated soils media layer, thus reducing the threats caused
by urban development.

The following factors have been identified as potential contributors which can adversely affect
stormwater quality draining from the site:-

         •     Silt and sediment erosion
         •     Gross Pollutants
         •     Hydrocarbon runoff
         •     Nutrient runoff


The following sections of this report will outline the proposed measures to be incorporated during the
construction and operational phases of the proposed development.


5.1      State Planning Policy Assessment

The proposed development has been assessed against the State Planning Policy 2017 to determine if
stormwater quality requirements as set out by the Department of Environmental and Resource
Management will be triggered for the proposed development. The proposed residential development
will involve a Material Change of Use for urban purposes for a land area less than 2500m2. Therefore,
in accordance with the SPP 2017 stormwater quality treatment is not required for the proposed
development. However, whilst it is not a requirement of the SPP for stormwater quality requirements,
P06 in the Water Quality and Drainage Code (The Noosa Plan 2020) stated, all stormwater runoff is to
achieve maximum removal if nutrients, gross pollutants and suspended solids as determined by cost to
efficiency ratios.




 SCG Consulting engineers                            7                      SCG Ref: 33094(SWM).Rev A