The line chart illustrates the proportion of water in UK rivers as having excellent chemical quality from 1990 to 2002.
Overall, the water in Wales and Northern Ireland mainly sustained the highest water quality throughout the period, whereas there was a notable fluctuation in England and Scotland, with Scotland occupying the most dramatic rise and fall.
Looking at the line graph, Wales initially stood at 96% of good quality rivers, which was the dominant figure in the first period. After that, it nearly remained unchanged until 1998 before considerably declining to 80% in 2002. Additionally, the most second quality was Northern Ireland, which started at 82%, then slightly rising to nearly 90% before dramatically increasing to about 100% after experiencing a marginal decline by 2% over the period.
Looking at the line chart in more detail, the water quality in rivers of England occupied about 45% at first.There was a significant growth to nearly 70% afterwards until 1996 before significantly reducing by 40% in 1998, then recovering to around 50% in the final period. In addition, Scotland’s rivers experienced a slight increase to 30% in 1992, then remaining in an original position until 1996. Consequently, the rate of water quality considerably rose by 30% in 2000 before dipping to 40% in 2002.