2503-45382 SRA - REPS Approved Plan and Documents

                                   STORMWATER MANAGEMENT PLAN

Client: Noosa Shire Council                                                                  Location: Doonan




                               Figure 5-1 Site Stormwater Quality Catchment Plan

The areas used to model the source nodes were extracted from the proposed development plan. The
nominated fraction impervious for each source node modelled in MUSIC was therefore:
          Road source node: 100% impervious
          Ground cover source node: 0% impervious
          Roof source node: 100% impervious

5.2       MUSIC Model Parameters
The MUSIC Modelling Guidelines – South East Queensland Version 1.0 (WBD, 2010) was used to source base
and storm flow concentrations and runoff generation. The model was calibrated using the Bureau of
Meteorology (BoM) data from Cooroy, 1973 – 1983 at a 6-minute time step in accordance with the WBD
(2010) guidelines. All source nodes were set up in accordance with this guideline, specifically for split
catchments. No routing of drainage links was applied as a conservative approach. This approach assumes
that the flow through the drainage system is instantaneous, which likely overestimates the pollutant load.

Refer to Table 5-2 for the split catchment source node characteristics for each sub-catchment. A copy of the
MUSIC model is found in Appendix B.

                                  Table 5-2 MUSIC Source Node Characteristics

                                                 Ground Cover
              Sub-catchment    Road Area (ha)                      Roof Area (ha)   Total Area (ha)
                                                     (ha)
                   A               0.778              0.168             0.400           1.346
                   B               0.600              0.110             0.186           0.896




                                                  8                                       Project No: 244035
                                                                                         M25-0042 Rpt Issue A