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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.

Availability:

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

 

 

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