Flush Event 28th August 2003
28th August 12.5mm of rain fell on the roads and other impermeable surfaces
in the Bourne stream catchment.
The past 12 days had been dry, hence
rainfall on 28th August represented a 'first
Graphs below illustrate SUDS performance:
During a 'first flush' event, and
The effect of heavy rainfall on stream water quality
enlarged plan to locate the three SUDS
sampling points referred to
SUDS performance during a 'first flush event'
charts below illustrate how the two SUDS (Phase II the wetland, Phase I
the lagoon system) acted to treat these water, reducing bacterial
contamination, settling out the suspended solids that many pollutants will
attach themselves to, and - in the case of the lagoons, reducing the
Biological Oxygen Demand (BOD), all of which improve the quality of water