Engineering_Integrated Water Management Plan

2.2 Stormwater Quality Treatment
2.2.1 Strategy

The treatment train for the proposed development is shown in Figure 3. Runoff
from roofed areas will be collected in rainwater tanks and re-used for irrigation and
non-potable internal uses. The tanks have been sized to achieve a minimum 80%
reliability. Overflow from the tanks and road runoff will be treated via bioretention
systems prior to discharge from the site.


                              ROAD                   ROOFED AREA


                                                   RAINWATER TANK


                               BIORETENTION SYSTEM /
                              ENVIROPOD / STORMFILTER


                              RECEIVING ENVIRONMENT

Figure 3: Conceptual Treatment Train



2.3 Modelling Approach
2.3.1 MUSIC Parameters
An assessment of stormwater runoff quality from the proposed development site
has been assessed using the Cooperative Research Centre for Catchment
Hydrology’s (CRCCH) Model for Urban Stormwater Improvement Conceptualisation
(MUSIC). MUSIC is a decision support tool, used to plan and design appropriate
urban stormwater management systems at the conceptual level.
Climate data for the catchment was sourced from the MUSIC model database. The
rainfall and evaporation data template for this site has been based on data from
Nambour from 1/1/1989- 31/12/1998 with six (6) minute rainfall duration.
The “MUSIC Modeling Guidelines” (Water By Design, 2010) was used as the basis for
constructing the MUSIC model. The default parameters of the MUSIC model were
used in representing the treatment nodes (where applicable).
Table 3 and Table 4 outline the adopted source node parameters that were used in
the MUSIC model.




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