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 classified river water which contains high-

quality

substances

in different

rivers

in the UK from 1990 to 2002. The unit is measured in percentage. From an

overall

perspective, the

rate

of beneficial chemical

quality

had an upward trend in all

rivers

, with the exception of

Wales

.

Additionally

,

Wales

and Northern

Ireland

contained a majority of advantageous

substances

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substance

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quality

rates over the period. As can be obviously seen from the chart, the positive

rate

of nutrition

quality

in

Wales

and Northern

Ireland

had the opposite trend during 1999. The

quality

substances

rate

in

Wales

and Northern

Ireland

was approximately 95% and 85%, individually,

then

, the situation shifted during the subsequent year. In the year 1999, the beneficial proportion of the chemical

quality

rivers

in Northern

Ireland

surpassed

this

figure in

Wales

and culminated at 95%,

while

this

rate

in

Wales

was about 80%.

In addition

, the data indicates that

,

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about 45% and 25% of advantageous

substances

are contained in the water of England

rivers

and Scotland

rivers

, respectively.

According to

England

rivers

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Rivers

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, the chemical

quality

rate

experienced a fluctuation with the ending point at nearly 46% by the end of the observed period. In reference to Scotland’s

rivers

, the

quality

proportion of beneficial

substances

had a significant increase to about 55% in 2003 before it witnessed a downward trend to exactly 40% over the surveyed year 2002.