RFI - Attachment F - Engineering Report

Evaluation of Gully Pit Inlet Litter Control Systems– Brisbane City Council and Gold Coast City Council

                Testing and evaluation for each of the litter control systems were slightly
                different.


                36mm diameter horizontal bar.
                Testing of the horizontal bar was conducted with the modified litter
                sample only. It was accepted that the inlet would collect most organic
                litter and have no effect on the capture performance of the bar inlet
                configuration.


                Meshed Pit insert.
                Testing was conducted to determine capture efficiency of the meshed
                insert under fully blocked conditions. The insert was fabricated from
                sheet metal hence simulating blocked conditions. Testing was conducted
                using the standard litter sample.


                Litter Crate Basket (900x500x150).
                Assessment of collection performance, type of litter collected and
                comments on re-suspension and effect on hydraulics (with basket fully
                laden) for the standard litter basket was carried out.


                Enviropod Basket.
                The Enviropod insert required modifications to withstand the force of the
                high approach flow. The plastic sides on the top of the basket were
                replaced with sheet metal and strengthened.
                NB: A new plastic was being tested during this trial. Subsequently a
                plastic with increased strength and durability designed to withstand flows
                greater than 320l/s is now used on all Enviropod units.




                Urban Water Resources Centre               6             University of South Australia