A 90-year-old syphon will be replaced and 2.8km of channel will be remodelled as part of a $1million winter works project in Boort.
The two-pronged Goulburn-Murray Water project will see a portion of the Loddon Valley number one channel remodelled and rock-armoured, with the Calivil Creek syphon updated.
Project manager Jarrod O’Brien said the channel upgrade was due to be completed in early August and would extend the structure’s life span for another 80 to 100 years.
‘‘There will be 2000 tonnes of rock armour used to provide protection in the channel and reduce erosion and we have removed a considerable amount of silt from the bottom of the channel,’’ Mr O’Brien said.
‘‘Our teams have been pursuing this approach as a priority to take advantage of the significant cost savings this provided compared to not rock-armouring — we’re talking about hundreds of millions of dollars saved over more that 25 years.’’
Downstream of the channel, remodelling work has started on replacing the existing irrigation syphon, which will see two new 1800mm diameter pipes installed side by side.
Once completed the syphon will be capable of carrying up to 500Ml of irrigation flows each day through the Loddon Valley number one channel without impacting on the intersecting Calivil Creek.
The new structure will improve reliability and reduce maintenance costs.
‘‘As there were a number of leaks in the old syphon, it was due for replacement as part of G-MW’s asset management strategy,’’ Mr O’Brien said.
‘‘The new syphon has also been designed to not require any headwalls, significantly reducing the constriction time and overall cost.’’
Waste concrete from the old syphon has been transported to a local recycler where it will be crushed and reused for road base and farm laneways.