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Appendix C - Stormwater Management Plan
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Log in to see the plans as drawn31 October 2018
At this stage the pollutants modelled in MUSIC are Total Suspended Solids (TSS), Total Phosphorous
(TP) and Total Nitrogen (TN).
5.3.3.2 Rainfall
The rainfall data used in the model was based on the Bureau of Meteorology data from rainfall station
40059 Cooroy Composite. The model was run for a 10-year period from 1 January 1973 to 31
December 1983. The modelling time step was 6 minutes.
5.3.3.3 Rainfall Runoff Properties
In accordance with the recommendations of Water By Design’s MUSIC Modelling Guidelines for South
East Queensland rainfall runoff properties for commercial areas have been used.
These are listed in Table 2 below.
.
Parameter Value
Rainfall Threshold (mm) 1
Soil Storage Capacity (mm) 18
Initial Storage (% of capacity) 10
Field Capacity (mm) 80
Infiltration Capacity Co-efficient a 243
Infiltration Capacity Co-efficient b 0.6
Initial Depth (mm) 50
Daily Recharge Rate (%) 0
Daily Base Flow Rate (%) 31
Deep Seepage (%) 0
Table 2 – MUSIC Rainfall Runoff Parameters (Commercial)
5.3.3.4 Pollutant Export Parameters
Specific Pollutant Export Parameters must be applied to each node type as cited in the Water By Design
MUSIC Modelling Guidelines. The values shown in Table 3 are for split catchment commercial areas.
Runoff pollutant concentrations are generated stochastically from the defined mean and standard
deviation.
Excellence with Economy in Engineering 11
l:\7000-7999\7700-7799\7700\reports\31-10-18 stormwater management plan_issue b.docx
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