Reasonable mixing - A discussion of reasonable mixing in water quality management
August 1994
This paper intended to stimulate discussion amongst planners, engineers, scientists, managers and environmentalists and to improve understanding of the role of mixing zones in water quality management.
It identifies provisions relating to water classifications; describes mixing zones and non-compliance zones using practical examples; and proposes situations in relation to the size of, location of, and conditions within non-compliance zones under which reasonable mixing may be said to have occurred.
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Contents:
Introduction, objectives
Water management under the RM Act
Minimum standards
Regional plans and classification
Characteristics of mixing zones
The non-compliance zone
The size of the non-compliance zone
Predicting the size of the non-compliance zone
Assessing the effects of the non-compliance zone
Controls on water quality within the non-compliance zone
Does water quality within the non-compliance zone cause an adverse effect outside the zone?
Are there adverse effects within the no-compliance zone that frustrate the objectives of the underlying classification?
Non-compliance zones and classification
Conclusions
