Freshwater Data

NZ regional council freshwater nutrient and biomass measurements 2012-2020.

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Used to derive nitrogen and phosphorus concentrations and exceedance criteria for managing periphyton in fresh water.

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Creative Commons 4.0 International by Ministry for the Environment and Statistics New Zealand

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Variables:

• Site (the number of the data point itself)
• RC (Regional Council that collected the measurement)
• RCSiteID (the identifier used by that specific council)
• SiteName (the Site where the measurement was collected)
• DateChla (date the chlorophyll-a measurement was collected)
• Year (Year of collection)
• Month (Month of collection)
• Chla ( mg chlorophyll-a per square meter)
• NOxppb (Nitrous oxide parts per billion)
• NH4ppb (Ammonia parts per billion)
• DRPppb (Dissolved Reactive Phosphorus parts per billion)
• TNppb (Total Nitrogen parts per billion)
• TPppb (Total Phosphorus parts per billion)
• DINppb (Dissolved Inorganic Nitrogen parts per billion)
• EC (Electrical Conductivity)
• pH (acidity/basicness of the water at the sample location)
• Temp (water temperature in degrees Celsius at time of measurement)
• Turbidity (turbidity of the water at time of measurement)
• Clarity_m (water clarity, in metres, at the time of measurement)

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N/A values in the data set refer to an absence of measurement for that specific variable.

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Report:

environment.govt.nz/publications/derivation-of-nut...

Snelder T, Kilroy C, Booker D (2021) Derivation of Nutrient Criteria for Periphyton Biomass Objectives. Using regional council monitoring data. LWP and NIWA Ltd, Christchurch, New Zealand

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For subject matter questions please contact freshwater@me.govt.nz.