Work on two key siphons in the Campaspe region are now complete after successful restoration and replacement works during the 2018 winter irrigation shutdown period.
The important improvements were made between May 18 and August 6 at the two work sites 5km apart along one of Goulburn-Murray Water’s main carrier channels — Waranga Western Channel.
Lead project manager Linc Wellington said the $2.5million work on Bulls Siphon, which was designed and constructed in-house by G-MW, was delivered on time and about $200000 under budget.
The project involved removing the old deteriorated structure and replacing it with a new four-barrel 3m diameter reinforced concrete structure.
‘‘On August 6 we removed the coffer dams (the temporary dams) and water is now flowing as normal,’’ Mr Wellington said.
‘‘The added bonus of carrying out these works ourselves was that we had control of project timeframes and schedules.
‘‘Some minor out-of-channel works are still happening, so customers may see our staff in the area for a couple of weeks yet,’’ he said.
At Campaspe Siphon, the coffer dams were removed on August 4 and the three existing siphon barrels have been re-lined with fibre-reinforced concrete.
The barrels allow water from Waranga Western Channel to pass under the Campaspe River without interference.
‘‘The newly-relined siphon barrels are now in use. We’re happy to say this project was also completed on time and within our $3.7million budget,’’ Mr Wellington said.
‘‘This project was originally intended to be carried out over two winter periods but we were able to make some project innovations and find a way to complete the works this winter.
‘‘This has saved us a lot of time and costs for remobilisation.’’
He said the contractor, Downer Pipetech, had been carrying out final site clean-up works.
G-MW’s managing director Pat Lennon said the works would ensure the historic assets continued to provide service to Rochester and the Loddon Valley Irrigation District well into the future.