13. Appendix I - Integrated Water Mangement Plan

                                                                                Integrated Water Management Plan
                                                                        Noosa Marketplace : 2-20 HOFMANN DRIVE



3.2.2      Rainfall Parameters
Rainfall parameters input to RAFTS were sourced using ARR 2016 BOM IFD values.

3.2.3      RAFTS Parameters
Catchment characteristics are shown in Table 3-1. For the purposes of this hydrological model, land uses were
defined as per existing use. Catchment slopes were determined using drainage lines for each catchment.
Manning’s values were set to 0.045 for pervious areas and 0.015 for impervious areas as per Chapter 4.1 of
the Noosa Planning Scheme-Policy 5-Engineering Design Standards. Initial and continuing losses were set
using the ARR data hub depending on the event that was being modelled as shown in Table 3-2. While ARR
2016 sets out a method for determining initial and continuing losses for events and catchments, the adopted
approach is considered to be conservative. A lag time of 1 minute was applied to the model between the
upstream and downstream boundaries of the site to best represent existing conditions.




V190428 | 15 May 2019 | Commercial in Confidence                                                              7