Attachment 7B - Site Based Stormwater Manamgment Plan by ADG

                                                              RACV Noosa Resort: 94-142 Noosa Drive, Noosa Heads

                                                                       ADG Ref: 22366 C R10 Rev04 14.12.22.docx

                                                                                                 December 2022


 Contents
 EXECUTIVE SUMMARY                                                                                            5
 1     INTRODUCTION                                                                                           7
       1.1   Background                                                                                       7
       1.2   Background Information                                                                           7
       1.3   Property Detail                                                                                  7
 2     EXISTING SITE                                                                                          8
       2.1   Existing Site Features                                                                           8
 3     FLOODING                                                                                               9
       3.1   Flooding Considerations                                                                          9
 4     STORMWATER INFRASTRUCTURE                                                                             11
       4.1   Existing Infrastructure                                                                         11
       4.2   Lawful Point of Discharge (LPD)                                                                 11
             4.2.1     Existing LPD                                                                          11
             4.2.2     Proposed LPD                                                                          11
       4.3   External Catchment                                                                              11
 5     STORMWATER QUANTITY ASSESSMENT                                                                        12
       5.1   Proposed Development and Associated Issues                                                      12
 6     STORMWATER QUALITY ASSESSMENT                                                                         12
       6.1   Treatment Objectives                                                                            12
       6.2   Site Analysis and Design Strategy                                                               13
             6.2.1     Pre-Development Phase                                                                 13
             6.2.2     Bulk Earthworks Phase                                                                 14
             6.2.3     Construction Phase                                                                    14
             6.2.4     Maintenance                                                                           15
       6.3   Operational Phase Treatment                                                                     15
       6.4   Stormwater Quality Improvement Devices (SQIDs)                                                  15
             6.4.1     First Flush Device                                                                    15
             6.4.2     Bioretention Basin                                                                    15
       6.5   Rainwater Harvesting – Reuse Minimum Sizing of Rainwater Tank                                   16
             6.5.1     Internal Demand                                                                       16
       6.6   MUSIC Model                                                                                     16
       6.7   On-site Treatment Lifecycle Costs                                                               19
       6.8   Water Quality Monitoring                                                                        19
       6.9   Maintenance                                                                                     19
 7     CONCLUSION                                                                                            20


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