Phosphates in freshwater: standards for nature conservation (ENRR073)

English Nature produced proposals for a series of water quality criteria based upon a range of values of orthophosphate and ammonia concentrations and Biochemical Oxygen Demand, for the Special Ecosystem Use Class. It is envisaged that these criteria would be applied on a case-by-case basis to protect the specific nature of the river and its ecology, over and above the protection to be afforded by the Fisheries Ecosystem Use Class.

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ENRR073 - part 1, PDF, 1.3 MB 2011/11/25
ENRR073 - part 2, PDF, 1.8 MB 2011/11/25
ENRR073 - part 3, PDF, 2.8 MB 2011/11/25
ENRR073 - part 4, PDF, 2.5 MB 2011/11/25
ENRR073 - part 5, PDF, 2.2 MB 2011/11/25
ENRR073 - part 6, PDF, 1.9 MB 2011/11/25
ENRR073 - part 7, PDF, 1.2 MB 2011/11/25