Melbourne Water sheds light on the relationship between the AFL Grand Final and water consumption

The 2023 AFL Grand Final, one of the most highly anticipated sporting events in Australia, has always been a significant occasion for Melburnians. Beyond the excitement on the field, Melbourne Water has discovered a fascinating connection between this sporting event and the city’s water usage patterns, known as the ‘flush factor’.

This unique metric measures the percentage increase in water usage resulting from mass toilet flushing throughout the event.

According to Melbourne Water’s Water Operations Centre Lead, Dave White, over the past decade, Melbourne Water has been uncovering significant changes in water usage during the AFL Grand Final weekend.

The ‘flush factor’ measurement also serves as an indicator of the excitement and engagement of the crowd during the game.

“It appears on the day of the AFL Grand Final, Melbourne witnesses a noticeable shift in water consumption patterns. As the city's residents and visitors gather to watch the game, water usage experiences a significant drop during the match,” Mr White said.

This decline can be attributed to the fact that people are generally preoccupied with the game, resulting in reduced water-related activities such as showering, washing dishes, and using appliances that require water. Spikes in water usage occur at the end of each quarter of the game and after the final siren from simultaneous use of toilets, creating unusual data patterns that have caught the attention of water management experts.

One intriguing finding is that the level of excitement and tension during the match has a direct correlation with the ‘flush factor’. The data collected by Melbourne Water indicates a clear behavioural pattern among AFL fans. That is, the closer the score at the end of the game, the higher the flush factor.

Here are the Top 5 AFL Grand Finals with the Highest Flush Factor (percentage increase in water usage):

1. Western Bulldogs vs Sydney Swans in 2016 - Flush Factor: 101.0%

This memorable clash between Western Bulldogs and the Sydney Swans in 2016 witnessed an astounding Flush Factor of 101.0%. Fans across the nation were clearly on the edge of their seats, leading to an unprecedented surge in water usage during this epic showdown.

2. Collingwood vs St Kilda in 2010 - Flush Factor: 50.8%

The AFL Grand Final in 2010 between Collingwood and St Kilda resulted in a nail-biting draw, captivating fans with its intensity. This thrilling encounter generated a Flush Factor of 50.8%, highlighting the passion and excitement that resonated throughout the match.

3. Sydney Swans vs Hawthorn in 2012 - Flush Factor: 38.8%

The clash between the Sydney Swans and Hawthorn in 2012 left fans in awe with its display of skill and determination. This high-stakes match resulted in a Flush Factor of 38.8%, indicating the immense support and engagement from supporters.

4. West Coast Eagles vs Collingwood in 2018 - Flush Factor: 36.0%

In 2018, West Coast Eagles and Collingwood battled it out in a thrilling contest that captivated football enthusiasts. This fiercely contested Grand Final registered a Flush Factor of 36.0%, showcasing the dedication and enthusiasm of fans.

5. Geelong vs St Kilda in 2009 - Flush Factor: 35.0%

The 2009 Grand Final between Geelong and St Kilda proved to be a gripping encounter that had fans on the edge of their seats. With a Flush Factor of 35.0%, it was evident that supporters were fully invested in the outcome of this enthralling match.

“Melbourne Water’s ‘Flush Factor’ has shed light on the remarkable relationship between the AFL Grand Finals and water consumption,” added Mr. White.  

Melbourne Water's discovery of the ‘flush factor’ adds a new dimension to the AFL Grand Final. While all eyes will be on Collingwood and Brisbane Lions as they battle it out on the field, it is also crucial to recognise the impact of collective behaviour on water usage.

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