Appendix C - Stormwater Management Plan

TfA Project Group Pty Ltd                                                                                                                     Stormwater Management Plan
                                                                                                                                                   Development Application



   TABLE OF CONTENT


   1        INTRODUCTION ............................................................................................................1

   2        SITE DESCRIPTION ......................................................................................................1

   3        SITE TOPOGRAPHY AND EXISTING DRAINAGE ..........................................................2
   4        FLOODING ....................................................................................................................3

   5        PROPOSED DRAINAGE LAYOUT .................................................................................3

   6        WATER QUANTITY ASSESSMENT ...............................................................................4
       6.1      CATCHMENT ANALYSIS ............................................................................................................................................................... 4
       6.2      STORMWATER DETENTION SIZING ........................................................................................................................................... 4
          6.2.1   Rational Method .................................................................................................................................... 4
            6.2.2          Catchments ........................................................................................................................................... 5
            6.2.3          Time of concentration ............................................................................................................................ 5
            6.2.4          Coefficient of Discharge ........................................................................................................................ 5
            6.2.5          Rainfall Intensities ................................................................................................................................. 6
            6.2.6          Stormwater Design Flows ..................................................................................................................... 6
            6.2.7          Required Detention Volume .................................................................................................................. 7

   7        WATER QUALITY ASSESSMENT ..................................................................................8
       7.1      CONSTRUCTION PHASE ............................................................................................................................................................... 8
          7.1.1   Pollutants .............................................................................................................................................. 8
            7.1.2          Performance objectives ......................................................................................................................... 9
            7.1.3          Monitoring and Maintenance ................................................................................................................. 9
          7.1.4   Responsibility and Reporting................................................................................................................. 9
       7.2      OPERATIONAL PHASE ................................................................................................................................................................10
          7.2.1   Pollutants ............................................................................................................................................ 10
            7.2.2          Water Quality Objectives ..................................................................................................................... 10
            7.2.3          Stormwater Treatment Philosophy ...................................................................................................... 10
            7.2.4          Source Controls................................................................................................................................... 10
          7.2.5   Gross Pollutant Traps.......................................................................................................................... 11
       7.3      FUEL RELATED STORMWATER TREATMENT .........................................................................................................................11
          7.3.1   Fuel Dispensing Areas ........................................................................................................................ 11
            7.3.2          Underground Fuel Storage Tanks ....................................................................................................... 12
          7.3.3   Areas outside Canopy ......................................................................................................................... 12
       7.4      WATER QUALITY ASSESSMENT ...............................................................................................................................................12
   8        SITE MAINTENANCE AND MANAGEMENT PROCEDURES ........................................ 12
       8.1            MAINTENANCE PLANS FOR STORMWATER TREATMENT DEVICES .....................................................................................13
   9        LIFECYCLE COSTS ..................................................................................................... 13

   10       CONCLUSION ............................................................................................................. 13




                                 123 Eumundi Road (Cnr Walter Hay Drive), Noosaville QLD 4566                                                                           Table of Contents