Council News #232 - 16 February 2019

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INSIDE: LEVEE UPGRADE CONTINUES, DATE NIGHT A SUCCESS + MORE

Council News CITY OF WAGGA WAGGA

FIRST PRINTED SATURDAY 16 FEBRUARY 2019

Issue No: 232

Weekly information from us to you

PRIORITY PROJECT: Council’s Manager Project Delivery Rupesh Shah looks over a sample from Lake Albert. There have been promising signs the ultrasound trial (inset) can reduce blue-green algae levels in the lake during the first eight weeks of the project.

Promising signs from ultrasound trial A combination of innovative technology, research and science is behind the positive test data released at the eight-week mark of a Wagga Wagga City Council pilot project instigated to control blue-green algae in Lake Albert. Manager Project Delivery Rupesh Shah said the test results received since 21 January 2019 showed the concentrations of

all but one strain of blue-green algae have reduced to zero, including one of the most toxic – Dolichospermum. “Results are as we predicted; dolichospermum and all other types of algae would be controlled, but levels of microcystis, which is known to be the most resilient, are diminishing but still present," Mr Shah said. “The challenge is to keep it under the safe threshold. “The results are exceptional and demonstrate the ultrasound is doing its job to bring blue-green algae levels under control; the bloom usually experienced in January is gone. “And the bloom usually expected in midFebruary has not occurred.

“It’s important to add that levels wvill rise and fall depending on storm water runoff into the lake and temperatures, but the ultrasound has certainly demonstrated it can control the levels.” Council’s 12-month ultrasound trial was switched on in mid-December and needed to be active for more than six weeks before any effect could be measured. Ultrasound are sound waves with frequencies higher than the upper audible limit of human hearing. At specific frequencies, these sound waves can be used to control algae growth by inducing sono-chemical reactions in water. The Envirosonic units are solar powered and are installed on five pontoons anchored to the bottom of the lake.

Alerts are sent by SMS to designated mobile phones which allows staff to monitor the function of each ultrasound unit. Ultrasound is one of several short-term treatment options available for managing algae. In addition to being efficient and costeffective, the technology was selected because it was assessed to be best suited to the conditions at Lake Albert. Blue-green algae is a natural part of the freshwater environment and water authorities across NSW are grappling with management techniques to control algal blooms. Readings for bacteria levels at Lake Albert are updated online: wagga.nsw.gov.au/waterquality

Weekly waste tip Please aim to keep a distance of at least 50cm between your bins when you present them on the kerbside for servicing. This space is needed to allow the reaching arm to grab hold of your bin to lift and then empty it into the truck.


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