Lake Munmorah

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Results explained

Heavy rainfall in winter 2016 followed by a long, dry spell resulted in generally good water clarity and favourable conditions for the growth of both seagrass and phytoplankton. Phytoplankton growth rates are reflected in the higher than average chlorophyll-a levels in Lake Munmorah, which frequently exceeded the trigger level. Water clarity and seagrass depth range remained good as for the previous year, and thus there was no change in the overall ecological health grade.

Results explained

Long term average turbidity and chlorophyll-a concentrations were lower this year compared to last year, resulting in an improvement in the water quality grade. Seagrass depth range remained similar to last year. The improvements in water quality contributed to an improvement in the overall grade of Lake Munmorah.

Results explained

Decreases in seagrass depth range and consistently high turbidity and chlorophyll-a concentrations in Lake Munmorah resulted in a decrease in the overall grade for 2015. Since 2013, Lake Munmorah’s health has declined from Excellent to Fair.

Results explained

Notable increases in the average level of turbidity negatively affected the water quality grade in Lake Munmorah for 2014. Whilst seagrass depth range remained good and algal levels were stable the overall grade was reduced as a result of the increases in turbidity.

Results explained

The ecological health of Lake Munmorah improved from good in 2012 to excellent in 2013. This was as a result of improvements in algal (chlorophyll-a) and turbidity levels, and an increase in seagrass depth range.

Results explained

The ecological health in Lake Munmorah was good with improved results achieved since 2010. Water clarity was good with relatively low turbidity levels and moderate seagrass depth range. Unfortunately, high summer rainfalls contributed to elevations in algal (chloraphyll-a) levels.