HC Deb 11 July 1990 vol 176 c254W
Mr. Michael

To ask the Secretary of State for Wales what are the causes of the increase between 1987 and 1988 in the percentage of rivers in Wales that fall into class 3 and 4 of the National Water Council grading system as shown in table 2.09 of the "Environmental Digest for Wales".

Mr. Grist

Between 1987 and 1988, 364 stretches of rivers in Wales, totalling 1,602.6 km, changed classification. Details are held by the Welsh region of the National Rivers Authority. The increases of stretches falling within classes 3 and 4, at 0.8 per cent. (37 km) and 0.2 per cent. (7 km) respectively are such that the authority does not consider them to be indicative of any significant overall trend.

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