Stormwater Management Plan

Good Shepherd Lutheran College                                                                Odyssey Consulting Group
Proposed Unit Development                                                      Conceptual Stormwater Management Plan
Lot 30 on SP170751                                                                                   Project No: K4277
115 EUMUNDI NOOSA ROAD, NOOSAVILLE




        Figure 4:       Music Modelling Treatment Train

5.4.2   Design Parameters of the Stormwater Quality Improvement System
        Detailed design of the stormwater treatment train shall be in accordance with the WSUD, Technical
        Design Guidelines for South East Queensland – Version 1 (June 2006).

        BIO-RETENTION BASINS

        A bio-retention basin is designed to pond stormwater allowing it to percolate through a layer of filter
        media, typically sandy loam. Runoff passing through the filter media is collected with perforated pipe
        discharging to the downstream drainage infrastructure. The Bio-retention basins shall be located to
        treat all stormwater from development area.

        The bio-retention basins have been modelled with the following properties:

                   Filter media                          Sandy Loam;
                                                          5 – 10% Organic Content in            accordance      with
                                                          AS1289.4.1.1;
                                                          Average D50 0.45 mm;
                                                          Ksat 180 mm/hr;
                                                          TN Content = 400 mg/kg
                                                          Orthophosphate Content = 20 mg/kg
                   Filter media depth                    0.40 m;
                   Drainage layer                        0.20 m;
                   Extended detention depth              0.15 m;
                   Seepage                               0 mm/hr;
             
                                                                      2             2
                    Filter Area                           Basin 1: 20m , Basin 2: 4m ;
             
                                                                      2             2
                    Surface Area                          Basin 1: 20m , Basin 2: 4m .




K4277-0002                                          14 March 2018                                        Page 13 of 16