Wagga councillors will be asked to endorse the installation of a temporary weir across the Tatton Drain during Monday night’s meeting.
The aim of the proposed new weir was to create a pond to redirect water into Lake Albert during storm events.
Wagga council asset remediation engineer Peter Ross has recommended to councillors that the “temporary solution” would “help overcome water level issues within Lake Albert”.
Lake Albert Improvement Committee has endorsed the course of action despite the risk of making the current blue-green algae issues worse.
The proposed cost of this work is $52,000 from the 2018/19 Urban Drainage and Routine Maintenance Stormwater allocation of $743,654.
According to a report to councillors, there was $115,450 expenditure and commitments against that budget as of September 6.
“This proposal is to construct a small levee within the existing Tatton Drain to redirect water, which currently bypasses Lake Albert, into Lake Albert,” Mr Ross reported to councillors.
“The levee will be constructed to a height approximately 2.5 metres above the invert of the Tatton drain.
“The weir will then allow water to pool to a height that will enable water to flow back into Lake Albert. To enable this temporary process to work, the two existing gates on the weir wall at Lakeside Drive will need to be removed.”
Mr Ross’s report stated that the weir was “to only stabilise the level of the lake to within approximately 100 millimetres of its current level”.
“An important aspect of this project, which has been included within the cost estimate, is the placement of a temporary pedestrian barrier around the ‘pond’ to provide safety and to restrict public access to the weir and ponded water,” he stated.
“At a recent meeting of the Lake Albert Improvement Committee, Council staff advised that redirecting stormwater flows into the lake could add more nutrient to the existing water supply and thus exasperate the blue-green algae problem within the lake.
“Community members acknowledged this issue, but considered the greater need was for water inflow to the lake.”
More permanent works at the drain would require an assessment by Council’s Native Title Manager and a more detailed environmental review to be carried out.
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