The work scope included the Stockpile and Loadout Area then balance of Site earthworks. Following this exercise JDSi were again engaged to undertake detailed bulk earthworks design including hydrology and hydraulic analysis of external water courses with associated flood prevention.

Key Considerations

  • Earthworks design cognisant of existing roads and rail loop.
  • Design of flood protection measures and diversion of Western and Christmas Creeks.
  • Continual liaison with other disciplines and Operations to refine design.

Project Challenges

Earthworks Design

Design was based on a Client provided plant layout and included earthworks modelling for Stockpile Areas, future conveyor alignments, Radial Stacker, Administration Building, Heavy Vehicle Maintenance, Power Station & Switchyard, internal roads & drainage, RECO production tunnel and RECO emergency tunnel.

Roads and earthworks were designed to match the existing access road and rail loop levels. Earthworks grades ensured stormwater was directed to drains which discharged at existing culverts under the road and rail.

JDSi maintained ongoing communications with other disciplines to inform our design and ensure decisions did not result in design issues for others.

Drainage and Hydrology

The proposed plant site is located between Western Creek and Christmas Creek, both of which have significant catchments.

These creeks were hydraulically modelled which indicated that the plant area would be flooded in even moderate rainfall events. Due to several constraints it was not practical to try and raise the site levels so other solutions were required.

To protect the site, diversion flood bunds were designed around the perimeter and a portion of Western Creek realigned. The bunds and realignment were then incorporated into the model to ensure that the site would be adequately protected and there were no downstream impacts.

Project Description

  • Client:
    Worley Parsons
  • Start Date:
    2008
  • Completion Date:
    2008
  • Key People
Mike Beaverstock
Mick Beaverstock
Project Director