MCU10/2083 Development Application part 2 - Attachment 7 - Stormwater Management Plan





5.4      STORMWATERQUALITYTREATMENTTRAIN

AWSUDtreatmenttrainhasbeendevelopedtomeetthereductioncriteriaestablishedinTable10.BioRetention
areas with a total surface / treatment area of 113m2 will be utilised to capture and treat overland flows from
perviousandimperviousareas.HealthyWaterways‘WSUDTechnicalGuidelines’,statesthattoachieveadequate
loadreductiontargets,bioretentionsystemsaretobesizedatapproximately12%ofthecatchmentarea.Table
11providesacatchmentbreakdownforthetotalBioRetentionarea.

                                          Table11BioRetentionSystemDetails
                                                 BioretentionArea           PercentageofCatchment
                     CatchmentArea(ha)                   2
                                                          (m )                          Area(%)
                               0.386                     113                           2.93

ThebioretentionfiltermediashouldbeplantedwithaselectionofthevegetatedtypesasoutlinedinTable12.

                                Table12–SuitableBioRetentionVegetationTypes
                                                                                                           Planting
                                                                                              Height
           ScientificName                         CommonName                  Form                    Density
                                                                                               (mm)
                                                                                                          (Qty/m2)
Myoporumparvifolium                     CreepingBoobialla                   Prostrate 150           46
Cymbopogonrefractus                          BarbedWireGrass                        Tufted       300           810
Dianellacaeruleacv‘LittleJess’            BlueFlaxlily                           Tufted       400           46
Dichelachnecrinita                           LongHairedPlumeGrass                  Tufted       200           68
Erograstiselongatacv‘Elvera’               Elvera                                   Tufted       300           68
Imperatacylindrica                           BladyGrass                              Tufted       500           46
Lepidospermalaterale                         VariableSwordSedge                     Tufted       750           810
Lomandraconfertifoliasubsp                  MattingLomandra                         Tufted       300           46
confertifolia
Lomandraconfertifoliasubsp                  MatRush                                 Tufted       400           46
pallida
Poalabillardierecv‘Eskdale’                Eskdale                                  Tufted       450           68
Themedaaustralis                             KangarooGrass                           Tufted       400           68
Themedaaustraliscv‘Mingo’                  Mingo                                    Tufted       200           810

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
EngineeringGuidelinesTable12.1foradditionalinformationandsuitableplantvarieties.


5.5      MAINTENANCE

AbioretentionbasinmaintenanceplanwillbeprovidedattheOperationalWorksStage.



    SITEBASEDSTORMWATERMANAGEMENTPLAN–RevisionD      37GibsonRoad,Noosaville                                    Page 11



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JF

AU
URBANCONSULTANTS

 

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 113m* 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
(m?) Area (%)

0.386 113 2.93

 

Catchment Area (ha)

 

 

 

 

 

 

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
ee Height .
Scientific Name Common Name Form nan Density
(Qty/m’)
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 D 37 Gibson Road, Noosaville 11