Stormwater Management Plan

GOOD SHEPHERD LUTHERAN COLLEGE                                                                 Odyssey Consulting Group
Lot 30 on SP170751                                                              Conceptual Stormwater Management Plan
115 Eumundi Noosa Road, Noosaville                                                                    Project No: K4277




         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              0.30 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-C                                        05 November 2018                                      Page 13 of 16