Fishing for answers

Champion Lakes has previously been closed due to bacteria. Picture: Marcelo Palacios d400866
Champion Lakes has previously been closed due to bacteria. Picture: Marcelo Palacios d400866

VenuesWest chairman Graham Partridge said similar lines were installed above public swimming pools and near the wharfs in Fremantle.

The reduction in bird activity is part of a push to clean up and reduce sediment build-up in the treatment ponds.

A report by GHD commissioned by VenuesWest last year recommended the grid.

It also advised of the possible existence of a sludge layer that could be causing the spikes in levels of bacteria in the water body that have plagued the regatta centre.

Further investigation confirmed the presence of a sludge layer in the swale next to the water body.

Mr Partridge said pipeline was being designed to flush these treatment ponds.

‘The pipeline would enable VenuesWest to divert up to 10 per cent of the lake ‘top-up’ water sourced from the Yarragadee Aquifer into the treatment ponds,’ he said.

‘During a flushing event, the treatment ponds would be filled to winter time levels, allowing microbial contaminants that would otherwise reach highly concentrated levels to be flushed from the lake more regularly.

‘This flushing does not improve the quality of inflows into the Champion Lakes water body but it should help to reduce the impact of the ‘first flush’ rainfall events at the beginning of winter.’

The VenuesWest board also approved an allocation of $100,000 in the 2013/14 Capital Improvements Budget towards improving the efficiency of the residential stormwater treatment ponds in May last year.