Dredging Solutions for Sediment Removal in Peter Hopper Lake, Mill Park

Dredging Solutions for Sediment Removal in Peter Hopper Lake, Mill Park

Peter Hopper Lake in Redleap Reserve has been marked for upgrades for some time, to improve the engineering design and functionality and to elevate the amenity that the lake provides residents.

The first stage of this project involved removing the sediment that has settled in the lake over time.  As the lake is in parallel to the local stormwater network, the sediment source is largely run-off from roads and residential properties, typical for such water bodies.

City of Whittlesea engaged Enviropacific to use dredging methods to remove the sediment instead of full dewatering of the lake and removal with excavators. 


The successful dredging method has the following benefits:

  • Amenity of the lake largely remains during the removal works.
  • Potential for odour is greatly reduced as sediment disturbance occurs underwater.
  • Impact on the fauna and environment is drastically lower than a full dewatering process would impose.
  • Noise pollution is quite low compared to excavator and heavy machinery operations.

Geotextile dewatering bags are commonly used to dewater sediment dredge spoil.  Due to space and time restrictions, this solution could not be used for the entire dredge volume of approximately 3000 m^3.  To get the project underway, dewatering bags were used for the first 1500m^3, while Enviropacific’s Mobile Non-Destructive Drilling (NDD) Mud processing plant was repurposed for sediment dewatering duties. 

The NDD system uses shaker screens for coarse material separation (rocks, sticks and coarse sand) and the dewatering is achieved by a containerised centrifuge unit.  The result is clarified water that is returned to the lake and a dewatered sediment cake.  This sediment cake is transported to the disposal facilities via tandem trucks or sealed skip bins.


Tani Knight, Project Manager – Water VIC/SA/TAS, explains, “This project is the culmination of 3 years of development by the VIC Water team in the sediment removal and processing space and we look forward to expanding our offer as more potential clients become aware of our capabilities.”

Summary

  • Mobile Non-Destructive Drilling (NDD) Mud processing plant was repurposed for sediment dewatering duties. 
  • NDD system used shaker screens for coarse material separation and the dewatering was achieved by a containerised centrifuge unit. 
cLIENT
City of Whittlesea
tIMEFRAME
Not Available
lOCATION
Mill Park, Victoria
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