SCG 31030 Stormwater Management Plan · OPW22/0319

Mitigating Measures

          •        Well established refuse areas with ample storage bins. Fenced off where deemed necessary.

          •        Provision of ample litter bins across the commercial footprints of the site. Particularly in any
                   outdoor dining or areas of congregation.

          •        Promotion of stormwater surface runoff through landscaped areas or similar sediment traps.

          •        Promotion of stormwater surface runoff through landscaped areas or similar sediment buffering
                   strips/traps.

          •        Provide stormwater pits outside paved areas that receive runoff from areas prone to gross
                   pollutants with surrounding buffering measures, such as stone pitching.

          •        Provide gross pollutant inserts into stormwater pits within paved areas that receive runoff from
                   areas prone to gross pollutants.

Nutrient Runoff:

Nutrients such as Nitrogen and Phosphorus can be mobilized and transported in Stormwater runoff from the site.
This can compromise Water Quality Objectives.

Potential Causes

          •        Runoff from hard surfaces within the site.

          •        Detergents used in car washing and similar activities.

          •        Fertilisers used in propagation of landscaped areas.

          •        Embodied nutrients contained in silt (topsoil) runoff.

          •        Embodied nutrients contained in runoff.


Mitigating Measures

          •        Implement management plan for landscaping propagation. Use stable organically bound
                   fertilizers cultivated immediately prior to turf placement. Mulch over areas of exposed topsoil.

          •        Construction of silt fences during construction and maintained beyond completion of landscaping.

          •        Capture roof runoff and store for re-use.



6.0       STORMWATER QUANTITY:

Noosa Shire Council require no significant increase in stormwater runoff post development of sites.

To achieve this we are proposing to include a detention tank with a low flow orifice to detain a portion of the runoff
from the site and limit the flow rates to pre-development levels.


6.1       Rational Method:

To calculate the peak discharges for the site under existing (pre-development and proposed post-development)
conditions the rational method has been used in accordance with QUDM 2018.




 SCG Consulting engineers                                      6                             SCG Ref: 31030(SWM)


[OCR of page images]
Mitigating Measures
° Well established refuse areas with ample storage bins. Fenced off where deemed necessary.

° Provision of ample litter bins across the commercial footprints of the site. Particularly in any
outdoor dining or areas of congregation.

° Promotion of stormwater surface runoff through landscaped areas or similar sediment traps.

° Promotion of stormwater surface runoff through landscaped areas or similar sediment buffering
strips/traps.

° Provide stormwater pits outside paved areas that receive runoff from areas prone to gross

pollutants with surrounding buffering measures, such as stone pitching.

° Provide gross pollutant inserts into stormwater pits within paved areas that receive runoff from
areas prone to gross pollutants.

Nutrient Runoff:

Nutrients such as Nitrogen and Phosphorus can be mobilized and transported in Stormwater runoff from the site.
This can compromise Water Quality Objectives.

Potential Causes

° Runoff from hard surfaces within the site.

° Detergents used in car washing and similar activities.
° Fertilisers used in propagation of landscaped areas.
° Embodied nutrients contained in silt (topsoil) runoff.
° Embodied nutrients contained in runoff.

Mitigating Measures

° Implement management plan for landscaping propagation. Use stable organically bound
fertilizers cultivated immediately prior to turf placement. Mulch over areas of exposed topsoil.

° Construction of silt fences during construction and maintained beyond completion of landscaping.

° Capture roof runoff and store for re-use.

6.0 STORMWATER QUANTITY:
Noosa Shire Council require no significant increase in stormwater runoff post development of sites.

To achieve this we are proposing to include a detention tank with a low flow orifice to detain a portion of the runoff
from the site and limit the flow rates to pre-development levels.

6.1 Rational Method:

To calculate the peak discharges for the site under existing (pre-development and proposed post-development)
conditions the rational method has been used in accordance with QUDM 2018.

SCG Consulting engineers 6 SCG Ref: 31030(SWM)