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The National Policy Statement for Freshwater Management came into effect in 2020. Some of the resources below contributed to policy development, and others can be used to support implementation of the new regulations.

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Technical Report

Advice for application of the physiographic method to the West Coast Region

Land and Water Science Ltd. was contracted to provide services to West Coast Regional Council through an Envirolink Small Advice Grant. The aim of the…
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Technical Report

Evaluation of the physiographic method for the Tasman Region

The work undertaken in this project provides Tasman District Council with a foundation for which the physiographic approach can be applied within the region. The…
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Technical Report

Application of Physiographic Science to the Northland Region: Preliminary Hydrological and Redox Process-Attribute Layers

Water quality outcomes can vary spatially across the landscape, even when there are similar land use pressures. These differences are often the result of natural…
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Towards a Physiographic Map: Information for Regional Councils

Physiographic Environments of New Zealand research is developing a cost-effective technique to measure and map (as an integrated physiographic layer) how features of the natural…
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Technical Report

Essential freshwater: Impact of existing periphyton and proposed dissolved inorganic nitrogen bottom lines

This report for the Ministry for the Environment applies methods developed in the LUS research programme to help resource management professionals understand the implications of…
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A Heuristic Method for Determining Changes of Source Loads to Comply with Water Quality Limits in Catchments

A common land and water management task is to determine where and by how much source loadings need to change to meet water quality limits…
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Journal Article

Nitrogen loads to New Zealand aquatic receiving environments: Comparison with regulatory criteria

There is concern about the deteriorating nutrient status of aquatic receiving environments in New Zealand. We estimated the amount by which current nitrogen (N) concentrations…
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Assessing the Effectiveness of On-Farm Mitigation Actions

This research summary describes how effective on-farm mitigations have been so far, by comparing losses of nitrogen (N), phosphorus (P) and sediment in 1995 and…
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Journal Article

Implications of water quality policy on land use: A case study of the approach in NZ

Achieving good water quality through output controls is difficult. The New Zealand Government recently proposed enforceable bottom lines to protect ecosystem health of 1 mg…
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Interactive Tool

Map of Total Nitrogen Excess and Reduction Potential

An interactive map shows the total nitrogen (TN) in excess of current national rules and the potential for mitigation strategies to reduce TN losses from…
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What the data tells us about our water

By bringing together multiple data sources, we can now see which catchments are under the most pressure, and whether applying all known and emerging on-farm…
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Quantifying Excess Nitrogen Loads in Fresh Water

At least 43% of New Zealand’s agricultural land (31% of New Zealand’s total land area) is in catchments that are under pressure (‘pressure’ meaning the…
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