New Zealand Gazette – 2014 – No. 71

Page 2011

✨ Freshwater Management Standards

NEW ZEALAND GAZETTE, No. 71

Value	Ecosystem health
Freshwater Body Type	Rivers
Attribute	Periphyton (Trophic state)
Attribute Unit	mg chl-a/m² (milligrams chlorophyll-a per square metre)

Attribute State	Numeric Attribute State (Default Class)	Numeric Attribute State (Productive Class¹)	Narrative Attribute State
	Exceeded no more than 8% of samples²	Exceeded no more than 17% of samples²
A	≤50	≤50	Rare blooms reflecting negligible nutrient enrichment and/or alteration of the natural flow regime or habitat.
B	>50 and ≤120	>50 and ≤120	Occasional blooms reflecting low nutrient enrichment and/or alteration of the natural flow regime or habitat.
C	>120 and ≤200	>120 and ≤200	Periodic short-duration nuisance blooms reflecting moderate nutrient enrichment and/or alteration of the natural flow regime or habitat.
National Bottom Line	200	200
D	>200	>200	Regular and/or extended-duration nuisance blooms reflecting high nutrient enrichment and/or significant alteration of the natural flow regime or habitat.

Classes are streams and rivers defined according to types in the River Environment Classification (REC). The Productive periphyton class is defined by the combination of REC "Dry" Climate categories (i.e. Warm-Dry (WD) and Cool-Dry (CD)) and REC Geology categories that have naturally high levels of nutrient enrichment due to their catchment geology (i.e. Soft-Sedimentary (SS), Volcanic Acidic (VA) and Volcanic Basic (VB)). Therefore the productive category is defined by the following REC defined types: WD/SS, WD/VB, WD/VA, CD/SS, CD/VB, CD/VA. The Default class includes all REC types not in the Productive class.
Based on a monthly monitoring regime. The minimum record length for grading a site based on periphyton (chl-a) is 3 years.

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Domain🏛️ Governance & Central Administration
KeywordsRivers, Ecosystem Health, Periphyton, Trophic State, Environmental Standards, Water Quality

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