MDBA Executive Director, Dr Andrew Kremor said lowering the lake provided the best means of controlling the highly invasive water weed Egeria densa but it would also allow other maintenance work to be completed.
“Lowering the water level in the lake to control this invasive waterweed is a necessary operation that occurs every 3 to 5 years,” Dr Kremor said.
“Lake Mulwala is a popular water-skiing and boating spot, and the waterweed can make it difficult to launch boats, fish, swim or water ski without getting tangled in the weed.
“The last time the lake was lowered was in 2018 and since then the weed has become dense so it’s important that we act this winter to improve the condition of the lake to support the community, businesses and the health of the lake itself.
“In order to kill the waterweed, we need to expose it to the air and winter frosts which we will do by lowering the lake by 5 metres below operating level and holding that level for about a month.
“We expect to bring the lake back to its regular operating levels by early August.”
The MDBA has consulted with the local angling and water-ski clubs, irrigators, local councils, the Yorta Yorta Traditional Owners, tourism and hospitality operators, NSW and Victorian government agencies and others to confirm the best date.
“We know that Lake Mulwala, on Yorta Yorta Country, is an important asset for recreation, tourism and local businesses and we appreciate the involvement of the community as we prepare for these works. We have consulted widely to ensure the timing and extent of the lowering can have the best results with as little impact as possible.
GMW Water Storage Services General Manager Martina Cusack said lowering the water level would expose large areas of the lakebed, allowing for a range of works to be conducted.
“We plan to use this opportunity to carry out maintenance under and around the bridge including pylon inspection, as well as lake retaining wall works and erosion repairs,” she said.
“It also offers an excellent opportunity for residents around the lake to carry out inspections and maintenance on their own infrastructure, such as jetties, boat ramps, retaining walls and pipe intakes.”
In the last 15 years Lake Mulwala has been lowered five times in 2008, 2009, 2011, 2015 and again in 2018.
Each time the lake is lowered it creates a major economic injection into the local economy from visitors wanting to see the eery lake empty while at the same time it provides an opportunity for major works on retaining walls and jetties.
