MCU10/2083 Information Request Response 37 Gibson Rd Noosaville

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5.4       STORMWATER QUALITY TREATMENT TRAIN

A WSUD treatment train has been developed to meet the reduction criteria established in Table 10. Bio-Retention
areas with a total surface / treatment area of 120m2 will be utilised to capture and treat overland flows from
pervious and impervious areas. Healthy Waterways 'WSUD Technical Guidelines', states that to achieve adequate
load reduction targets, bio-retention systems are to be sized at approximately 1-2% of the catchment area. Table
11 provides a catchment breakdown for the total Bio-Retention area.


                                         Table 11 - Bio-Retention System Details
                                                 Bio-retention Area            Percentage of Catchment
                    Catchment Area (ha)
                                                          (m)                         Area (%)
                             0.386         _              120                           3.11



The bio-retention filter media should be planted with a selection of the vegetated types as outlined in Table 12.


                                  Table 12 - Suitable Bio-Retention Vegetation Types
                                                                                                                  Planting
                                                                                                     Height
             Scientific Name                              Common Name                      Form                   Density
                                                                                                         ( mm )
                                                                                                                  (Qty/r2)
Myoporum parvifolium                           Creeping Boobialla                       Prostrate   150           4-6

Cymbopogon refractus                           Barbed Wire Grass                        Tufted      300           8-10
Dianella caerulea cv 'Little Jess'             Blue Flax-lily                           Tufted      400           4-6
Dichelachne crinita                            Long Haired Plume Grass                  Tufted      200           6-8
Erograstis elongata cv 'Elvera'                Elvera                                   Tufted      300           6-8

Imperata cylindrica                            Blady Grass                              Tufted      500           4-6

Lepidosperma laterale                          Variable Sword Sedge                     Tufted      750           8-10
Lomandra confertifolia subsp                   Matting Lomandra                         Tufted      300           4-6
confertifolia
Lomandra confertifolia subsp                   Mat Rush                                 Tufted      400           4-6
pallida
Poa labillardiere cv 'Eskdale'                 Eskdale                                  Tufted      450           6-8
Themeda australis                              Kangaroo Grass                           Tufted      400           6-8

Themeda australis cv'Mingo'                    Mingo                                     Tufted     200           8-10



The plants selected must be able to tolerate periods of inundation and a saturated filter material. Therefore
plants with extensive fibrous root systems are required. Refer to Australian Runoff Quality and BCC WSUD
Engineering Guidelines Table 12.1 for additional information and suitable plant varieties.



5.5       MAINTENANCE

A bio-retention basin maintenance plan will be provided at the Operational Works Stage.




  SITE BASED STORMWATER MANAGEMENT PLAN - Revision E            Cason Road, Noosa,