Penrith Weir HEADING 560x2

Penrith Lakes Weir 3 

Principal: PLDC

Contractor : Ward Civil 

Engineer: J Steel Australasia / Pile Design Solutions

Date: Apr 2014 - Dec 2014

Scope/Product: Structural & Foundation Design  

Vinyl & Steel Sheet Piles         



Penrith Lakes Development Corporation (PLDC), part of the local Penrith community since 1980, required a stepped weir to control the entry of flood waters from the Nepean River to the Penrith Lakes Scheme. The weir forms part of the larger Penrith Lakes Scheme which also provides flood mitigation benefits for surrounding and downstream areas. The weir is located adjacent to the Nepean River at the base of the Blue Mountains, NSW.

Key Requirements and Scope:

J Steel was engaged to design and supply the main construction materials for the weir walls. PLDC required a cost effective, sustainable and long life alternative to the conventional weir design and construction proposed by other consultants. The J Steel design included the structural and geotechnical design of the steps, aprons and anchored abutments using a range of traditional and innovative construction materials.

"J Steel’s engineers provided us with an innovative and cost effective solution to the original concept for Weir 3. The use of flat panel vinyl sheet piling provided an aesthetically pleasing alternative to conventional construction materials. The vinyl sheet pilling was completed within our construction program and well within budget.". Robert Golaszewski, Project Manager

Solutions and Benefits:

  • PLDC preferred the aesthetics of the flat panel vinyl sheet pile over the original gabion basket reference design.
  • The vinyl sheet pile solution allowed the project to be completed significantly below budget and ahead of schedule.
  • J Steel worked proactively with Ward Civil, Civil Sydney and PLDC in the difficult onsite geotechnical conditions to manage and solve any issues.
  • Up to 60m of vinyl sheet pile wall for the weir steps was installed per day. Ward Civil and Civil Sydney are to be congratulated for the efficiency achieved.
  • The sheet piles were manufactured from recycled materials providing increased sustainability benefits.
  • The weir design utilising the vinyl sheet piles provided better hydrological performance than the reference design.
  • Vinyl sheet piles are UV stabilised and supplied with 50 year product warranty to meet the 50 year design life.

J Steel wish to thank PLDC for the opportunity to work on this exciting project.

 The 420m long Weir 3 structure. 

 Weir under construction.

 Uncoated steel sheet piles were utilized in the abutment walls.

 The Penrith Lakes Weir 3 project was completed ahead of schedule and well within its original budget.

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