This technical guidance will help councils with the process set out in the Periphyton Attribute Note in the National Policy Statement for Freshwater Management 2014 (as amended 2017). This Note requires regional councils to set appropriate instream concentrations and exceedance criteria for nitrogen and phosphorus to achieve periphyton objectives, while ensuring the outcomes sought for sensitive downstream environments are also achieved. The Note provides a step-by-step process for councils to follow. The technical guidance explains each of the steps in the process and includes worked examples and case studies.
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The guide will be finalised in February 2019.