Analysis of water quality in New Zealand lakes and rivers / prepared for Ministry for the Environment by Scott Larned, Ton Snelder, Martin Unwin, Graham McBride, Piet Verburg, Hilary McMillan.

By: Larned, Scott [author.].
Contributor(s): Snelder, Ton [author.] | Unwin, Martin [author. ] | McBride, Graham [author.] | Verburg, Piet [author.] | McMillan, Hilary [author.] | New Zealand. Ministry for the Environment [Issuing body.] | National Institute of Water and Atmospheric Research (N.Z.).
Material type: materialTypeLabelBookSeries: NIWA client report: CHC2015-033Publisher: [Wellington, N.Z. : Ministry for the Environment, 2017]Description: 1 online resource.Subject(s): WATER QUALITY | NEW ZEALAND | LAKES | RIVERS | NUTRIENTS | FRESH WATER | GUIDELINES | TREND ANALYSIS | WATER QUALITY MANAGEMENTHoldings: ELECTRONIC Online resources: CHC2015-033 Ministry for the Environment website | Analysis of water quality in New Zealand lakes and rivers. NIWA document server
Contents:
Executive summary -- 1 Introduction -- 2 Data acquisition, organisation and processing -- 2.1 River data -- 2.2 Lake data -- 2.3 Data acquisition and organisation -- 2.4 Data processing and grooming -- 3 Analysis methods -- 3.1 Censored values -- 3.2 Grouping river and lake sites -- 3.3 Water quality state -- 3.4 Trend analyses -- 4 Results – river and lake state -- 4.1 River state – nutrients, ECOLI and CLAR -- 4.2 River state - MCI -- 4.3 Lake state -- 5 Trend results -- 5.1 River trends - nutrients, ECOLI and CLAR -- 5.2 River MCI trends -- 5.3 Lake water quality trends -- 6 Discussion -- 6.1 State and trends in water quality -- 6.2 New procedures for censored data and trend analyses -- 7 Acknowledgements -- 8 References -- Appendix A A new approach to water quality trend assessment -- 1. Summary -- 1.1. Implementation -- 2. Problems with the traditional trend testing approach -- 2.1 Unfortunate properties -- 2.2 Unfortunate inferences -- 3 A alternative approach -- 3.1 A refined set of questions -- 3.2 How may these questions be answered? -- 4 Potential issues with the proposed approach -- 5 Implementation -- 6 References -- Appendix B Nutrient concentration thresholds to achieve periphyton -- 1 Introduction -- 2 Methods -- 2.1 Periphyton data -- 2.2 Approximation of periphyton biomass as Chlorophyll a -- Explanatory variables -- 2.3 Derivation of concentrations thresholds -- 3 Discussion -- 4 References
Summary: This report analyses the state of freshwater quality for the past 25 years based on a national scale model. It provides information on: - the current state and trends of lakes and rivers in New Zealand relative to the National Policy Statement for Freshwater Management bottom lines and guideline values - pressures that may affect water quality over time - how these pressures relate to water quality.
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ELECTRONIC 1 Not for loan 391574

"February 2015".

Publication date: December 2017

Publication reference number: CR 297

NIWA CLIENT REPORT No: CHC2015-033. Report date: February 2015. NIWA Project: MFE15503.

Executive summary -- 1 Introduction -- 2 Data acquisition, organisation and processing -- 2.1 River data -- 2.2 Lake data -- 2.3 Data acquisition and organisation -- 2.4 Data processing and grooming -- 3 Analysis methods -- 3.1 Censored values -- 3.2 Grouping river and lake sites -- 3.3 Water quality state -- 3.4 Trend analyses -- 4 Results – river and lake state -- 4.1 River state – nutrients, ECOLI and CLAR -- 4.2 River state - MCI -- 4.3 Lake state -- 5 Trend results -- 5.1 River trends - nutrients, ECOLI and CLAR -- 5.2 River MCI trends -- 5.3 Lake water quality trends -- 6 Discussion -- 6.1 State and trends in water quality -- 6.2 New procedures for censored data and trend analyses -- 7 Acknowledgements -- 8 References -- Appendix A A new approach to water quality trend assessment -- 1. Summary -- 1.1. Implementation -- 2. Problems with the traditional trend testing approach -- 2.1 Unfortunate properties -- 2.2 Unfortunate inferences -- 3 A alternative approach -- 3.1 A refined set of questions -- 3.2 How may these questions be answered? -- 4 Potential issues with the proposed approach -- 5 Implementation -- 6 References -- Appendix B Nutrient concentration thresholds to achieve periphyton -- 1 Introduction -- 2 Methods -- 2.1 Periphyton data -- 2.2 Approximation of periphyton biomass as Chlorophyll a -- Explanatory variables -- 2.3 Derivation of concentrations thresholds -- 3 Discussion -- 4 References

This report analyses the state of freshwater quality for the past 25 years based on a national scale model.
It provides information on:
- the current state and trends of lakes and rivers in New Zealand relative to the National Policy Statement for Freshwater Management bottom lines and guideline values
- pressures that may affect water quality over time
- how these pressures relate to water quality.

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