Treatment MeasuresRain Gardens : Treatment Performance
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As raingardens are similar in design to bioretnetion basins the bioretention system performance curves can be used for assessing the pollutant removal efficiency of a raingarden. Detail design criteria for bioretnetion basins can be found in Chapter 6 "Bioretention Basins" in the WSUD Engineering Procedures available for purchase from CSIRO publishing. The 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: