The presented bar chart illustrates the variations in water levels across six Australian cities during October 2009 and 2010.
Overall, the majority of the surveyed cities witnessed an upward trend in the water levels in the reservoirs in October 2010 compared to the preceding year. The only two exceptions were Darwin, where the water level decreased, and Brisbane which recorded no change. In addition, Canberra was the city with the highest percentage of water stored in its reservoirs in both years.
In October 2009, Sydney and Canberra had the most abundant water reserves, with approximately 75% water capacity each. Brisbane, Darwin, and Perth followed, registering figures ranging from 40% to approximately 55%. In contrast, Melbourne recorded the lowest water percentage in its reservoirs, hovering around 25%.
One year later, Perth witnessed the largest increase in water levels, hitting a high of just above 70%. Having a similar trend, the figure for Canberra reached a peak of nearly 100%, making it the city with the highest level of water. Although Sydney and Melbourne also experienced upward trends, their growth was less pronounced, with respective figures in 2010 of 80% and 40%. Conversely, Darwin encountered a notable decline in its reservoir water, decreasing to just under 30% of its capacity in October 2010. Finally, the figure for Brisbane remained unchanged compared to the previous year.