Stormwater Management Report

8   STORMWATER QUALITY MANAGEMENT


The Water Sensitive Urban Design Technical Design Guidelines for South East Queensland recommends the
following minimum reductions in the annual pollutant loads leaving a development site compared to the developed
unmitigated case:

            •   ≥90% reduction in Total Suspended Solids Load (TSS);
            •   ≥60% reduction in Total Phosphorus Load (TP);
            •   ≥45% reduction in Total Nitrogen Load (TN);
            •   ≥100% reduction in Gross Pollutant Load (GP).




8.1 Proposed Stormwater Treatment Train

All site stormwater runoff from the site is proposed to pass through a bio-retention basin adjacent to the southern
boundary of the allotment prior to discharging through the existing drainage infrastructure.

The efficiency of the proposed treatment train has been identified using the Model for Urban Stormwater Improvement
Conceptualisation (MUSIC V6.2) developed by Monash University.

A schematic layout of the treatment train, as input into the MUSIC model, is shown in Figure 3 below.




                                      Figure 3 - MUSIC Version 6.2 Schematic Layout




HR DESIGN                                         Reference No: 18-0165A                                    Page 7 of 14