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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
Figure 2: Water ‘jetting’ due to build up of pollution.
Hydraulic performance.
On-grade tests:
The reinforcing bar did not effect the hydraulic capture performance of
the inlet for on-grade tests.
Sag tests:
Under sag conditions, the bar alone significantly reduced capture
capacity (see Figure 3). The flow pond depth at invert was up to 50mm
greater for the case with the horizontal bar. Testing was also conducted
to assess the effect on pond depths at invert with litter retained by the
horizontal bar. As expected, the litter reduced the capacity of the inlet to
capture flow, with pond depth increase up to 120mm greater for the same
approach flow. Litter retained by the horizontal bar further reduced the
hydraulic capacity of the gully pit.
Urban Water Resources Centre 9 University of South Australia
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