Attachment 6 - Stormwater Management Plan

R1767: NOOSA LANDFILL: CLEAN WATER DRAIN AND HES BASIN (SW5) – DESIGN REPORT & MAINTENANCE AND INSPECTION PLAN




TABLE OF CONTENTS
1    INTRODUCTION                                                                                                1
2    CATCHMENT AND STAGING                                                                                       1
3    DRAINAGE DESIGN                                                                                             1
     3.1. DIVERSION DRAIN TO BASIN                                                                               1
     3.2. INLET DRAIN FOR DOSING                                                                                 1
     3.3. LEVEL SPREADER WEIR                                                                                    1
     3.4. DECANT STRUCTURE                                                                                       1
     3.5. EMERGENCY SPILLWAY                                                                                     1
     3.6. CLEAN WATER DIVERSION DRAIN                                                                            2
          3.6.1. MANNINGS ROUGHNESS SENSITIVITY ANALAYSIS                                                        2
4    BASIN VOLUME AND SIZE                                                                                       2
     4.1. EA REQUIREMENT                                                                                         2
     4.2. ASSESSMENT APPROACH                                                                                    2
     4.3. HISTORIC RAINFALL PERIOD                                                                               2
     4.4. CATCHMENT                                                                                              2
     4.5. CATCHMENT LOSSES                                                                                       3
          4.5.1. 10 YEAR 24 HOUR TRADITIONAL BASIN                                                               3
          4.5.2. TYPE A HES BASIN                                                                                3
     4.6. BASIN OPERATION APPROACH                                                                               3
          4.6.1. 10 YEAR 24 HOUR TRADITIONAL BASIN                                                               3
          4.6.2. TYPE A HES BASIN                                                                                3
     4.7. RESULTS                                                                                                3
5    HYDROLOGIC & HYDRAULIC MODELLING                                                                            3
     5.1. RAINFALL                                                                                               4
     5.2. PEAK FLOW RATE                                                                                         4
     5.4. PEAK FLOW DEPTHS                                                                                       6
6    OPERATION & MAINTENANCE                                                                                     7
     6.1. DOSING SYSTEM                                                                                          7
     6.2. MONITORING SYSTEM                                                                                      7
     6.3. SEDIMENT BASIN                                                                                         7
          6.3.1. FOREBAY                                                                                         7
          6.3.2. MAIN CELL                                                                                       8
     6.4. DESIGN EVENT & COMPLIANCE                                                                              8
APPENDIX A – CATCHMENTS & STAGING                                                                                9
APPENDIX B – BASIN CALCULATIONS                                                                                  10




Environment. Engineering. Education                                                                               PAGE ii