Treatment MeasuresWetlands : Treatment Performance
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The curves below show pollutant removal performance expected for constructed wetland 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 |
|---|---|
| Wetland treatment nodes were modelled for 200mm and 400mm extended detention depths using the following parameters: | |
| Wetlands (200mm) | TSS: k=1500, c*=6 TP: k=1000, c*=0.06 TN: k=150, c*=1 Extended Detention = 200mm Inlet Pond Volume = 0.1 x Surface Area Permanent Pool Volume = 0.4 x Surface Area Overflow Weir Width = 200m Notional Detention Time = 72hrs |
| Wetlands (400mm) | TSS: k=1500, c*=6 TP: k=1000, c*=0.06 TN: k=150, c*=1 Extended Detention = 400mm Inlet Pond Volume = 0.1 x Surface Area Permanent Pool Volume = 0.4 x Surface Area Overflow Weir Width = 200m Notional Detention Time = 72hrs |