LATE RFI Attachment 6 - Stormwater Management Plan

    2. Applicability Guide
    As a modular biofiltration system, there are some considerations that should be incorporated into the design
    process. These are indicated below in Table 1.



     Design Consideration                   Applicability   Information

     At source stormwater treatment               ✓         SPELBasin® systems are ideal for capturing runoff as it
                                                            leaves a road, carpark and/or catchment surface.
     Litter, sediment & nutrient capture          ✓         Biofilters utilise physical, biochemical and biological
                                                            processes to remove particulates and dissolved pollutants
                                                            from stormwater.
     Urban/civic landscaping                      ✓         The modular configuration allows landscaping to be
                                                            incorporated into roadscapes and traditionally hard
                                                            cityscapes.
     Constrained sites                            ✓         SPELBasin® systems can be as small as 0.6% of the
                                                            contributing catchment, and lifted into difficult to access
                                                            locations.
     Moderate to steep gradient sites             ✓         The fibreglass and precast concrete chambers promote
                                                            unique alternatives to retaining walls and features in
                                                            steep sites.
     Sites with <600mm gradient                   ✓         Designs can accommodate internal invert level increases
                                                            to achieve discharge on very flat sites, provided a free
                                                            surface can be achieved.
     Tidal influence                              X         SPELBasin® is not suitable for locations that are subject to
                                                            tidal influence.
     Tailwater                                   ---        Tailwater can affect the treatment flow rate through the
                                                            SPELBasin®, and should be avoided if possible. Check
                                                            with SPEL Stormwater.
     High velocity flowpaths                      X         As a filtration and biological treatment system, high
                                                            velocity flowpaths may cause damage to the SPELBasin®.
                                                            An external bypass is recommended.
     Greywater treatment                          ✓         SPELBasin® systems have been observed to remove
                                                            nutrients and suspended solids from stormwater. They
                                                            could equally remove nutrients from greywater.

    TABLE 1.
    APPLICABILITY GUIDE FOR SPELBASIN®




4        Technical Design Guidelien SPELBasin