8. Volume 5 - Stormwater Management Plan

                                         LAMBERT & REHBEIN
                                            ENGINEERS • MANAGERS • SCIENTISTS


4.3.2   DEVELOPED SITE CATCHMENTS

The intent of the stormwater quality assessment is to provide an appropriate level of stormwater
quality improvement for the proposed developed site.

A review of the proposed development displayed in the architectural plans in Appendix B was
undertaken to determine an appropriate stormwater quality modelling approach. Refer also to
catchments shown on the civil engineering plans in Appendix C.

MUSIC models the rainfall-runoff and pollutant generation processes within a source node with
unique pollutant export parameters for each different land use type. As required by the Water by
Design, MUSIC Modelling Guidelines Version 1.0 (2010), the proposed development was
modelled using a “split catchment approach”, where each surface of the development is
separated based on its land use. A breakdown of the proposed developed catchment areas is
presented in Table 12.

                    Table 12 Proposed Development Sub-Catchment Areas
                         Roof            Road          Ground             Ground
 Catchment                                                                                      TOTAL
                          (m2)           (m2)       (Pervious m2)     Impervious m2
 Catchment A              586            1351              95               141                  2,173
 Catchment B               -              140             100                13                   253

   TOTALS                586 m2        1,491 m2         195 m2              154                2,426 m2


The identified sub catchments were modelled with commercial node parameters as per the
Healthy Waterways Water by Design “MUSIC Modelling Guidelines Version 1.0, 2010”. These
parameters presented in Table 13 and Table 14 overleaf.




 Ref: B16239CR002                                      - 13 -                        Stormwater Management Plan
                                                                                  Noosa Energy Centre - Noosaville