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Author Topic: Lake Mulwala to be lowered this winter  (Read 1223 times)

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Lake Mulwala to be lowered this winter
« on: February 15, 2015, 08:42:04 PM »
Lake Mulwala to be lowered this winter
12 February 2015 - MDBA

Communities around Yarrawonga Weir are advised that the MDBA will lower Lake Mulwala  between late autumn and mid-winter to undertake structural works and manage the aquatic weed Egeria densa.

Lake users, including boat operators, recreational users and pumpers, should consider adjusting their activities for changed water levels.

MDBA head of River Management David Dreverman said the lake drawn-down would start in late April and the lake would be refilled to its normal operating range by late July.

"We are very aware of the importance of Lake Mulwala to the local community, so we've been talking with people in the area to limit any disruption to local activities," Mr Dreverman said.

"Starting in late April, the water level will be gradually lowered by 1.2 metres, reaching about 123.5 metres Australian Height Datum (AHD) by mid-May.

"We'll adjust the rate at which the lake is lowered to make sure supply is maintained to the major irrigation offtakes."

Mr Dreverman said the second phase of the draw down, from mid-May, would see the water level lowered to about 121.7 metres AHD, three metres below the normal operating level. It would be held at that level until about mid-July.

"We expect to start refilling Lake Mulwala by mid-July, ready for the start of the irrigation season.

"This draw down will allow routine testing of the weir structure and work to control erosion on the lake foreshore.

"It's also an opportunity to prevent the invasive water weed Egeria densa from becoming a problem. Subjecting the exposed weed to frost is the best way to stop it spreading to the extent that caused problems in 2009."

The MDBA will issue further advice in the coming weeks. The works plan may be altered in response to a survey of Egeria in March, and changing weather and river conditions. Sorry, only registered users can see this content. Please Login or Register.

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