The chart illustrates the water levels in reservoirs of 6 Australian cities in the same month of two different years.
First of all, we can see that the chart shows the amounts in percentages, 100% is the maximum of the reservoir. For exemple, in the city number one, in 2009 the level of the reservoir was 45% of maximum, one year after, so in 2010, the amount dropped by 20 percent, reaching 25% of the maximum. In the second city, we can see a different …, in 2009 the total was 75%, in 2010 the level rised to 85%, the reservoir was almost full. Cities number three and five had a similar pattern, the third one started with 25% in 2009 and reached 35% in 2010, the fifth had 40% in october 2009, one year after increased to 60%.
While city number 4, in two years analyzed had the same percentage, 55% of the maximum, so no difference between the two years. Differntly, city number 6 in 2009 had a level of 75%, 12 months after the level incresed to 95%, so pratically the maximum.