Attachment 4 - Stormwater Management Plan by O2 · MCU13/0251

Table of Contents
1.    Introduction                                                                                    1
2.    Site Characteristics                                                                            2
      2.1. Land Use                                                                                   2
      2.2. Topography and Drainage                                                                    2
3.    Construction Phase Stormwater Quality Management                                                4
4.    Operational Phase Stormwater Quality Management                                                 5
      4.1. Bioretention Systems                                                                       5
            4.1.1. Maintenance                                                                        5
      4.2. Additional Treatment Considerations                                                        6
5.    MUSIC Modelling                                                                                7
      5.1. Software Version                                                                          7
      5.2. Guidelines                                                                                7
      5.3. Water Quality Objectives                                                                  7
      5.4. Rainfall and Evapotranspiration Data                                                      7
      5.5. Rainfall Runoff Parameters                                                                7
      5.6. Pollutant Export Parameters                                                               8
      5.7. Catchments                                                                                8
      5.8. Bio-retention Systems                                                                     9
      5.9. MUSIC Model                                                                              10
      5.10. Results                                                                                 11
6.    Water Quantity Management                                                                     12
      6.1. Introduction                                                                             12
      6.2. Rational Method                                                                          12
      6.3. Catchments                                                                               12
      6.4. Coefficient of Runoff                                                                    12
      6.5. Time of Concentration                                                                    14
      6.6. Rainfall Intensities                                                                     14
      6.7. Site Hydrology                                                                           15
      6.8. Hydrologic Modelling                                                                     15
            6.8.1. Rational Method Comparison                                                       15
      6.9. Hydraulic Modelling                                                                      16
            6.9.1. Mitigation Measures                                                              16
7.    Summary                                                                                       18
8.    Reference List                                                                                19

Figures
Figure 1– Site Location (Source: Nearmap)                                                            1
Figure 2 – Coastal Creeks Catchment (Source: Healthy Waterways)                                      2
Figure 3– Site Topography and Drainage Plan                                                          3
Figure 4– Typical phases in the creation of a development site(Source: Water by Design, 2009)        4
Figure 5– Typical Cross-Section through a Bioretention System (Source: Water by Design, 2009)        5
Figure 6 - MUSIC Catchment Plan                                                                      9
Figure 7– MUSIC Model Layout and Results                                                            11
Figure 8 – Pre Development Catchment Plan                                                           13
Figure 9 – Post Development Catchment Plan                                                          13
Figure 10 - Baffle Weir and Orifice Configuration                                                   17


STORMWATER MANAGEMENT PLAN – PEREGIAN VILLAGE MARKET                                            Page iii

Scanlon Property Group
R002616