P0198-25-001_12_Gympie_Street_Tewantin_SWMP

List of Tables and Figures




Table of Contents
Executive Summary ............................................................................................................................. 3

1         Introduction ................................................................................................................................ 4

          1.1     Background and Scope .............................................................................................................................. 4
          1.2     Stormwater Management Objectives and Design Approach .................................................................. 4
          1.3     Supporting Documentation and Reports ................................................................................................... 5
2         Existing Site ................................................................................................................................ 6

          2.1     Site Overview .............................................................................................................................................. 6
          2.2     Flow calculation using the Rational Method ............................................................................................. 7
          2.3     DRAINS model and comparison to Rational Method ................................................................................ 9
3         Proposed Development Works ................................................................................................ 12

          3.1     Proposed Site Description........................................................................................................................ 12
          3.2     Time of Concentration Inputs into DRAINS ............................................................................................. 13
          3.3     Hydrological Modelling Results ................................................................................................................ 14
          3.4     Stormwater Detention and Mitigation Strategy ...................................................................................... 15
4         Stormwater Quality .................................................................................................................. 17

          4.1     Introduction ................................................................................................................................................17
          4.2     Stormwater Quality Modelling (MUSIC) Methodology ............................................................................17
          4.3     Stormwater Pollutant Reduction Performance ....................................................................................... 18
          4.4     Analysis and Compliance with Water by Design Guidelines .................................................................. 18
          4.5     Stormwater Management Implications.................................................................................................... 18
          4.6     Erosion and Sediment Control ................................................................................................................. 19
5         Conclusion ................................................................................................................................ 20




    12 GYMPIE STREET, TEWANTIN
    Stormwater Management Plan
    Client Reference: P0198-25-001                         4 November 2025
    Prepared for Novato Group