Attachment 8 - Interim Stormwater Management Plan - TOPO · 132005.638.06

R5304: NOOSA RESOURCE RECOVERY CENTRE - STORMWATER MANAGEMENT PLAN



3                EXISTING STORMWATER MANAGEMENT
Based on analysis of the survey data and aerial photography, catchment delineation has been undertaken over the site,
as well as identification of the key drainage features conveying runoff to treatment systems and the approved discharge
locations. 22 site catchments have been defined, as well as 2 external catchment that direct runoff into the site. An
extract of catchment plan is provided as Figure 4, with catchment details summarised in Table 2.




Figure 4 – Existing Catchment Plan

The existing drainage features are presented as Figure 5. A copy of the catchment plan and the existing drainage plan
also included as Appendix A.

       +      The bulk of the site discharges to one of the existing HES basins discharging to SW2 and SW5.
       +      A sediment basin is provided within Catchment 16 for the treatment of stormwater runoff from the active filling
              area:
                  o It is unclear whether runoff from a portion of Catchment 17 that appears to be disturbed is receiving
                      appropriate treatment.
                  o If this is a dirty water catchment and cannot be graded to the basin in Catchment 16, runoff should be
                      directed to the southern HES (SW5).
       +      Portions of the site along the eastern boundary (Catchments 12 and 22) appear to have the potential to be
              released at a non-approved discharge location:
                  o Based on the analysis of aerial photography, these catchments seem to be predominantly ‘clean’ due
                      to the extent of vegetation.
                  o Further investigation may be required to ensure the requirements of the permit are being met in relation
                      to approved discharge points.




Environment. Engineering. Education.                                                                                  PAGE 8