The presented line graph delineates the variations in reservoir water levels, expressed as percentages of maximum capacity, across six Australian cities for the months of October in 2009 and 2010.
In summary, all cities exhibited an increase in water levels over the one-year period, with the exceptions of Darwin, which experienced a sharp decline, and Melbourne, which showed a modest rise. Notably, Canberra achieved complete capacity by October 2010.
In October 2009, Sydney’s water levels were recorded at approximately 55%, which saw a rise to about 70% in the following year. Melbourne started with slightly over 30% and incrementally increased to around 45%. Brisbane’s water level grew modestly from about 40% in 2009 to 50% in 2010. In contrast, Perth experienced a gradual ascent from roughly 23% to approximately 34%, indicating a slight improvement in its water levels. Canberra, starting at 50%, dramatically surged to reach 100%, marking it as the only city to attain full reservoir capacity by 2010.
Conversely, Darwin presented a significant decline in its water levels, plummeting from 20% in October 2009 to 80% in October 2010, thereby becoming the city with the lowest water levels by the end of this period. This stark reduction contrasts sharply with the increases observed in the other cities. Overall, the data illustrates a complex narrative of water level variances across these cities, highlighting the disparities in water management and climatic influences during this timeframe.