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To restore streams degraded by
urbanisation, bioretention basins (‘raingardens’)
are implemented worldwide to reduce stormwater volumes, peaks flows and pollutant loads entering streams. While they are effective
at this, their ability to mimic natural flow regimes has received limited field investigation. We monitored the hydrology and water quality
of a bioretention basin during a three-year period. We found that the basin
reduced the delivery of polluted water to the stream (55–65% of catchment runoff
released as treated outflow), with peak flows and event concentrations of TSS, TP and TN substantially
lowered too. A smaller proportion of catchment runoff
infiltrated into the surrounding soil, but the flow regime delivered by the basin to the local stream was not
similar to nearby forested streams. Such systems can mitigate the impacts of
urban runoff on
streams and shift the urban water balance towards natural conditions, but
complete flow
regime restoration requires catchment-scale action.