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RFI - Attachment F - Engineering Report
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Evaluation of Gully Pit Inlet Litter Control Systems– Brisbane City Council and Gold Coast City Council
Hydraulic Capture Performance
On-grade
When compared to the standard lip in line gully pit, the capture capacity
of the Enviropod basket was:
• The same for 1% and 4% longitudinal tests
• At 12% grade:
• 12L/sec less between 200 and 320 L/sec approach flow for the
fine mesh basket, and
• the same at 200L/sec for the coarse mesh basket, and 6L/sec
less at an approach flow of 320L/sec.
It was observed at the 12% grade that a plastic drinking bottle and plastic
bag were trapped in the overflow outlet, reducing the capture capacity of
the pit insert (see Figure 8).
Plastic bottle caught in outlet
Figure 8: Litter trapped in overflow outlet.
Urban Water Resources Centre 17 University of South Australia
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