LATE RFI Attachment 6 - Stormwater Management Plan

4.5 SURFACE LEVEL SET-DOWN                                  4.7 PLANT SELECTION

Pedestrian and vehicular safety is important when           Plant selection for the SPELBasin® is very similar to that
integrating the SPELBasin® into the roadscape and           of a traditional biofilter. Wetland grasses and shrubs are
cityscape. Therefore, designers need to consider the        most suitable with a core species list provided below.
interchange between the filter surface and surrounding
landscape.
                                                             Species name      Common name            Plant habit

 Application area            Surface level setdown           Banksia robur     Swamp Banksia          Small tree/
                                                                                                      shrub
 Roadscape                   Maximum 200 mm                  Callistemon       Little John, Wee       Small-
 Footpaths/bikeways          Maximum 500 mm                  viminalis         Johnnie, Harkness,     medium tree/
 Parkland, landscaping       Maximum 1000 mm                 hybrids           Kings Park Special     shrub
                             where barriers or fencing                         Bottlebrush
                             are included                    Ficinia nodosa Knobby club-sedge         Sedge/grass
                                                             (also known as
4.6 EDGE INTERFACE                                           Isolepsis
                                                             nodosa)
The SPELBasin® system is supplied in precast concrete        Gahnia aspera     Red-fruited            Sedge
or prefabricated fibreglass structures. This results in a                      saw-sedge
vertical edge to the technology. Also, there is a defined
                                                             Imperata          Blady grass            Grass
inlet to the system. Designers should allow for surface
                                                             cylindrica
gradients to transport flow to the inlet location, and
provide edge treatments (barriers, vegetation, batters)      Juncus            Common Rush            Sedge/grass
to discourage pedestrian and/or vehicular access to          usitatus
the filter media and outlet chambers.                        Lomandra          River mat-rush         Grass
                                                             hystrix
Edge treatments could incorporate treated-timber
                                                             Lomandra          Spiny-headed           Grass
sleepers, rock blocks, fencing, bollards or barrier
                                                             longifolia        mat-rush
planting.
                                                             Melaleuca         Thyme honey            Shrub
                                                             thymifolia        myrtle
                                                             Melaleuca         “Snow in Summer”       Shrub
                                                             linariifolia
                                                             Melaleuca         Black tea-tree         Small tree
                                                             bracteata

                                                            TABLE 2.
                                                            RECOMMENDED PLANT SPECIES FOR SPELBASIN®


                                                            Due to the high permeability of the SPELBasin® filter
                                                            media, it may be necessary to irrigate newly planted
                                                            systems until they are established, or reliable, regular
                                                            rainfall is received.

                                                            Planting density is recommended to be 6 plants/sqm,
                                                            and a variety of species should be used, instead of a
FIGURE 6.                                                   monoculture.
SPELBASIN® WITH TIMBER SLEEPER EDGE TREATMENT




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