Civil Engineering Report

 3 March 2022


 5.4.2 Stormwater Quantity Management Strategy

The existing case where stormwater discharges via sheet flow will be improved as roofwater from
the future houses will discharge to the stormwater infrastructure located at the south east
boundary of the site, the Ghostgum Court kerb and the Butler Street Kerb. Therefore, no
stormwater detention will be required as part of the development in accordance with the Noosa
Shire Council Infrastructure Design Planning Scheme Policy.

 5.4.3 Stormwater Quality Management Strategy

The development does not involve six or more lots, therefore the development does not trigger the
water quality requirements of the State Planning Policy July 2017. As a result, no water quality
improvement devices are proposed as part of this development.

The future residential developments on the new lots will incorporate ‘best management practice’
such as roofwater first flush diverters and landscape swales, wherever possible, to minimise
impacts and satisfy water quality requirements.

5.5       Construction Phase (Sediment and Erosion Control)

 5.5.1 Intent of Erosion and Sediment Control Management Plan

To prevent stormwater contamination (of watercourses) and the release of contaminated
stormwater and wastewater by ensuring compliance with the Environmental Protection Act 1994
and Environmental Protection (Water) Policy 2009.

 5.5.2 Implementation Strategy

Establish control measures and best practice approaches to prevent stormwater contamination
and minimise the risk and adverse effects of erosion and sedimentation. All Erosion and Sediment
Control measures must be designed, constructed and maintained in a manner that is
commensurate with the site’s erosion risk.

 5.5.3 Erosion and Sediment Control Measures

      •   Obtain a license or approval to operate activities that are classed as environmental
          relevant activities (i.e. they have the potential to cause environmental harm).
      •   Implement and maintain appropriate control measures to prevent sediment laden
          wastewater and other potential pollutants such as oil, paint and wet concrete from entering
          the stormwater system via stormwater drains and gullies. The control measures which
          must be considered to be adopted are:
              o Limitation of site access during construction to minimise disruption to traffic.
                  Install a temporary construction entry/ exit sediment trap at all site accesses to
                  minimise mud and sediment from the site being tracked onto public road,
                  particularly during wet weather or when the site is muddy.
              o Install and maintain appropriate sediment fences around construction areas.
              o Divert clean stormwater runoff, using catch drains, around construction areas to
                  existing or new stormwater drainage system.
              o Install sandbags and other pollution containment devices around stormwater
                  drains and any other locations where required to prevent sediment entering the
                  trunk stormwater system.


 Excellence with Economy in Engineering                                                                 9
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