Treatment MeasuresBio-Retention Systems : Treatment Performance
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The curves below show pollutant removal performance expected for bioretention systems for varying extended detention depths. These curves are based on the Melbourne hydrological region and it is expected that different hydrological regions will result in varying treatment performances. The size of the treatment measure can be simply adjusted to ensure suitable performance in other regions throughout greater Victoria. These adjustment factors are provided in Chapter 2 of the WSUD Engineering Procedures (PDF 691kb).
These curves are the basis to the STORM tool, a web based system for assessing the performance relative to best practice objectives for TN.
The curves were derived using the Model for Urban Stormwater Improvement Conceptualisation (MUSIC) (Cooperative Research centre for Catchment Hydrology 2003).
The curves were derived assuming the systems receive direct runoff (ie no pre-treatment) and have the following characteristics:
| Treatment Measure | Values used in Music 3.0 |
|---|---|
| Bio Retention treatment nodes were modelled for 100mm and 300mm extended detention depths using the following parameters: | |
| Bio Retention (100mm) | TSS: k=8000, c*=20 TP: k=6000, c*=0.13 TN: k=500, c*=1.4 Filter Depth = 0.6m Filter Area = Surface Area m3 Overflow weir width = 200m Effective Particle Diameter = 0.45mm Saturated Hydraulic Conductivity = 180mm/hr Extended detention depth = 100mm |
| Bio Retention (300mm) | TSS: k=8000, c*=20 TP: k=6000, c*=0.13 TN: k=500, c*=1.4 Filter Depth = 0.6m Filter Area = Surface Area m3 Overflow weir width = 200m Effective Particle Diameter = 0.45mm Saturated Hydraulic Conductivity = 180mm/hr Extended detention depth = 300mm |