The chart below shows the percentage of river water in UK rivers that is classified as having good chemical quality between 1990 and 2002.

The given line graph illustrates the proportion of good chemical

water

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in 4 parts of the UK (

Wales

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,

Scotland

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, Northern

Ireland

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and

England

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) from 1990 to 2002.

Overall

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, what stands out from the graph is that

rivers

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in

Wales

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and

Scotland

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demonstrated a higher percentage of good

quality

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water

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than

rivers

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in two other parts. The

figures

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for good

water

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in

Wales

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and

Scotland

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remained stable for most of the period,

while

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in Northern

Ireland

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and

England

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fluctuated. Looking at the details, in 1990,

rivers

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in

Wales

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had the best chemical

quality

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water

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at nearly 97% followed by

rivers

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in

Scotland

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starting at 95%,

however

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, the latter took the lead. In 1998, the

figures

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had an opposite trend with the former declining to nearly 94% in 2002,

while

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the latter rose to 97% in 2000 and remained stable until 2002.

In contrast

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, the starting

figures

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for the

quality

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of

water

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in

rivers

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in Northern

Ireland

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and

England

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were 92% and 83% respectively. From 1992 to 1994, the percentage of

rivers

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in Northern

Ireland

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significantly increased outnumbering the

quality

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of

rivers

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in

Scotland

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at around 96%,

however

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, it declined to the lowest point at 83%. The

figures

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for the

quality

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of

rivers

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in

England

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and Northern

Ireland

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rose to 90% and 97% respectively,

whereas

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the latter took the lead in 2002, becoming the best

quality

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of

water

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in

rivers

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.