Attachment 5A - Noosa Landfill RRA Flood Assessment

Noosa Landfill RRA Flood Assessment



7 ADVICE RELATING TO FUTURE PLANNING AND DESIGN
This assessment has considered a preliminary design of the RRA fill pad. As further design and
planning of this facility proceeds it is likely that the RRA filling will be revised. It is recommended
that HWMC be consulted through this process to ensure that the positive outcomes for this
assessment are maintained.

The fill pad modelled for this assessment excludes filling over the existing bioretention system
northeast of the RRA. HWMC foresee no issue with this bioretention system being removed to
make way for the RRA provided that the site’s water quality obligations are met and site runoff to
this location is appropriately managed.

The fill pad modelled for the current assessment directs local RRA runoff northwards. This was
done to provide a level of conservatism to the results by not having RRA runoff be subject to
storage attenuation associated with the existing sediment pond south of the RRA. HWMC foresee
no issue with directing RRA runoff to the existing sediment pond to the south however this is likely
to alter internal site flood levels and therefore analysis should be undertaken to ensure facilities
maintain appropriate levels of flood immunity.




J00352R1V2                                                                                          12