Scg 33094(Swm)

               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



5.1      State Planning Policy Assessment

The proposed residential development involves a land area less than the assessment benchmark value
of 2500m2 for stormwater quality measures as required in the State Planning Policy 2017, Therefore,
stormwater quality treatment is not required for the proposed development.


5.2      Construction Phase

Sediment generated during the construction phase shall be controlled in accordance with a site-specific
Erosion and Sediment Control (ESC) Plan and kept on site throughout construction. A detailed ESC
should be documented by a suitable experienced professional prior to works commencing on site.

The SPP (DILGP, 2017) Appendix 2 – Stormwater Management Design Objectives Table A: Construction
phase – stormwater management design objectives outlines design objectives for construction phase
requirements for stormwater quality.




 SCG Consulting engineers                            7                            SCG Ref: 33094(SWM)