20 November 2009
INVESTIGATIONS START AT YARRA RIVER WEIR
- New weir considered for Yarra
- Improved migration for fish
- Community input welcome
Investigative work is starting at the historic Dights Falls Weir in Abbotsford this week to determine the best options for replacing the old weir.
General Manager of Waterways, Chris Chesterfield, said the Dights Falls Weir was originally constructed in the 1840s to provide water to a nearby mill, but now it plays an important role in controlling water levels in the Yarra River.
“Dights Falls is a significant Melbourne landmark but the stability of the structure itself has to be our first priority,” Mr Chesterfield said.
“Earlier studies found the weir has reached the end of its natural life and needs to be replaced, and that the current fish-way needs to be improved to assist fish migration.
“We want to protect the heritage values of the site, by ensuring the new weir is of similar shape, form and height to the existing structure.
“The geotechnical investigations will include drilling seven bore holes and the excavation of two test pits. Upstream drilling of the weir will be conducted from a barge and works downstream will be accessed via a temporary ramp.
“The comprehensive survey of the Dights Falls area will help us to develop design options for a new weir and fish-way,” Mr Chesterfield said.
Melbourne Water will work closely with key groups including Heritage Victoria, the local council, river users and fishing groups in planning the new weir.
The current weir is a barrier to fish migration, and while a fish-way installed at Dights Falls about 15 years ago has helped some fish to move upstream, studies have shown it could work better.
About 70% of the native fish species found in Melbourne’s rivers and creeks are known to have life stages that require migration either upstream or downstream and fish-ways are vital in supporting endangered species like the Australian Grayling.
The investigative project is being undertaken by the Waterways Alliance – a partnership between Melbourne Water, Ecodynamics, Fulton Hogan and SMEC.
The geotechnical investigations are expected to be completed by early 2010.
Media Contact: Andrew McGinnes – 03 9235 7277; 0403 930 846