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The Surface Waters (River Ecosystem) (Classification) Regulations 1994
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- UK Statutory Instruments
- 1994 No. 1057
- Regulation 2
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Classification of waters
2.—(1) A system employing the classifications RE1, RE2, RE3, RE4 and RE5 is prescribed as a system of classification applying to inland freshwaters which are relevant rivers or watercourses(1).
(2) The criteria for each of the classifications RE1 to RE5 are that the following requirements are satisfied by a series of samples of water taken and analysed in accordance with regulation 3, that is to say—
(a)the 10 percentile of the saturation of dissolved oxygen shall not be less than the value specified in respect of that classification in column (2);
(b)the 90 percentile of the biochemical oxygen demand shall not exceed the value specified in respect of that classification in column (3);
(c)the 90 percentile of the concentration of total ammonia shall not exceed the value specified in respect of that classification in column (4);
(d)the 95 percentile of the concentration of un-ionised ammonia shall not exceed the value, if any, specified in respect of that classification in column (5);
(e)the 5 percentile of the pH value shall not be less than the lower value, if any, specified in respect of that classification in column (6), and the 95 percentile of the pH value shall not exceed the higher value, if any, so specified;
(f)the 95 percentile of the concentration of dissolved copper shall not exceed the value, if any, which is specified in respect of that classification in column (8) by reference to the hardness of the water as described in column (7); and
(g)the 95 percentile of the concentration of total zinc shall not exceed the value, if any, which is specified in respect of that classification in column (9) by reference to the hardness of the water as described in column (7).
(1)
See the Water Resources Act 1991, section 104, for the definitions of “inland freshwaters” and “relevant river or watercourse”.
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