LATE RFI Attachment 6 - Stormwater Management Plan

6. MUSIC Model                                             7. Summary
   Application
                                                           The SPELBasin® modular biofiltration system provides
                                                           treatment of stormwater in a package that can be
The Model for Urban Stormwater Improvement                 quickly and simply installed. The SPELBasin® has been
Conceptualisation (MUSIC) is a software tool that          independently field tested in accordance with the
simulates the behaviour of stormwater quality in urban     Stormwater Australia SQIDEP protocol at Sippy Downs,
catchments. This tool is widely used in the Stormwater     Queensland. The SPELBasin® provides pollutant
Industry by professionals and this section provides        reductions of 86% TSS, 65% TP, 50% TN and should
a consistent and uniform approach for modelling            provide the same 99% gross pollutant reduction of
SPELBasin® in all urban development projects. It is        traditional biofilters. A Generic MUSIC# node for
the aim here to provide a step by step guide for the       modelling SPELBasin® is recommended and scaling the
assessment authorities to ensure the model is a correct    technology in increments of 10L/s per module should
representation of the ultimate installed products in the   maintain the pollutant removal performance observed
field.                                                     in the Australian Field monitoring.

SPELBasin® is represented in MUSIC using a generic         Maintenance is required as per SPEL’s Operation &
node. Field research of the SPELBasin® found that          Maintenance Manual to ensure optimal performance.
the observed parameters were outside the algorithm
bounds inside MUSIC and therefore to build a model
that reflected the observed results required model
inputs vastly different to those implemented onsite.
Therefore, treatment efficiency of the SPELBasin®
generic node is instructed by the observed field
performance. The design treatment flow rate (TFR) of
a standard SPELBasin® module is 10 L/s with removal
rates of 99% GP, 86% TSS, 65% TP, 50% TN. The
following inputs are recommended for the Generic
node;

             Input           Output          Removal
 Pollutant
             Concentration   Concentration   %
 Gross      100              1               99
 Pollutants
 TSS         100             14              86%
 TP          100             14              86%
 TN          50              25              50%




FIGURE 9.
SPELBASIN® MUSIC NODE FOR GROSS POLLUTANTS REMOVAL



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