Information Response - Email 1 of 2 MCU16/0153 & REC16/0041

                                         STORMWATER MANAGEMENT PLAN
      Client: Thomco (No 2087) Pty Ltd                          Location: 215 David Low Way, Peregian Beach

      Figure 3 presents the typical parameters adopted for the modelling of the bioretention basins
      (Bioretention A shown). The surface area adopted in the model represents the mean water surface
      area, assuming 1 in 3 batters at the edges of the bioretention basins.




      Figure 3 - Typical Bioretention Parameters


4.3          MUSIC Model Parameters
      The MUSIC Modelling Guidelines – South East Queensland Version 1.0 (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 Nambour, 1989-1998 at a 6-minute time step. This is in
      accordance with Water by Design’s MUSIC Modelling Guidelines – South East Queensland Version
      1.0 (2010). For evapotranspiration values, the mean PET values for Sunshine Coast Regional
      Council (central) from Table 3.1 of the MUSIC Modelling Guidelines – South East Queensland
      Version 1.0 (2010) were adopted. All source nodes were set up in accordance with this guideline,
      specifically for split catchments. No routing of drainage links was adopted for the purpose of taking
      a conservative approach. This approach assumes that the flow through the drainage system takes
      no time, which over estimates the likely pollutant load. MUSIC version 6.2.1 was used for this
      assessment.
4.4          Land Use/Source Node Areas
      The proposed development is comprised of short stay units, dual use accommodation apartments,
      permanent residential dwellings, entrance and access roads and landscaped areas. Each catchment
      has been divided into three (3) source nodes for MUSIC modelling purposes. These source nodes
      include treated roof, groundcover and road/hardstand areas (Table 4).

                                     Table 4 – MUSIC Source Node Characteristic


      Covey Associates Pty Ltd                           8                                 Project No: 162042
      Consulting Engineers                                                                  100949Rpt Issue B