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kent street weir upgrade

Department of Water

Perth, WA

2016 – 2017


project overview

The Kent Street Weir required upgrading to extend its life and improve operational activities, public access and water level management to limit tidal intrusions.

Ertech undertook the design and construction of the weir upgrade including demolition of the existing weir structure and the design, manufacture, supply and construction of concrete piers, weir gates and a new walkway.

scope of works

The scope of works included:

  • Establish site working areas;
  • Temporarily relocate accessible parking bays and provide temporary canoe drop off area;
  • Reroute public access paths and relocate drinking fountain;
  • Locate and protect existing services;
  • Temporary sheet piled cofferdam, temporary floating booms;
  • Temporary water level management within the cofferdam;
  • Temporary works to allow low flows to bypass the weir;
  • Dedicated clear zone to allow weir bypass at high flows;
  • Provision of temporary public access across the river;
  • Demolition of the existing walkway, concrete piers and stop boards;
  • Supply, installation, connection and testing of cathodic protection system to existing sheet piles;
  • Reinforced concrete piers including connections into existing concrete sill beam and walkway bridge;
  • Provision of permanent power supply and back-up supplies;
  • Fabricate, install, test and commission hydraulic lay flat weir gates;
  • Supply stop boards;
  • Supply, install, test and commission hydraulic lay flat weir gate control system;
  • Supply and installation of all conduits, ducts, support systems, cable pits, cable ladders, cable trays and accessories;
  • Installation of 2 no. 75mm diameter spare conduits;
  • Fabricate, install, test and commission walkway;
  • Supply and install permanent floating safety booms;
  • Bank stabilisation and revegetation on completion;
  • Site restoration and removal and disposal of surplus material off site.

Ertech are a professional, reliable, responsive contractor and very efficient at responding to items raised and worked with all stakeholders to achieve the best for project outcome.” – Department of Water.

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