Water quality: related PDFs

Nutrient concentration criteria for periphyton biomass objectives

February 2023
LWP collaborated with scientists at NIWA to derive nutrient criteria to achieve periphyton biomass objectives for rivers in New Zealand.

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Research article on continuous measures of confidence in trend direction

February 2023
This article proposes abandoning null hypothesis significance tests in favour of continuous measures of confidence in direction of environmental trends

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Research article on land use suitability

February 2023
This study shows land-use suitability of land parcels is dependent on land and water management choices made elsewhere in the...

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Water quality trend analysis functions for R

November 2021
The LWP-Trends library to undertake water quality trend analysis in the R statistical computing environment (updated 17 November 2021).

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Trend assessment guidance including worked examples

May 2021
Guidance for the analysis of temporal trends in environmental data including and R code and data for worked examples.

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Manawatū-Whanganui Region Catchment Nitrogen Models

March 2021
LWP Ltd and Streamlined Environmental Ltd collaborated to set up and calibrate catchment nitrogen models to assist with Regional Plan Change...

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State and Trends of River Water Quality in the Manawatū-Whanganui Region

January 2020
This study analysed the available river water quality data in the Manawatū-Whanganui Region. The report describes the state of water quality...

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Solutions assessment for Regional Water Plan Change

January 2020
Environment Canterbury worked with the Waimakariri  zone committee over a number of years to develop a plan to manage water quality...

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Nitrogen allocation in the Hurunui catchment (Canterbury region) and its relevance for dryland farming

December 2018
This memo sets out the current state of nitrogen allocation in the Hurunui catchment in the Canterbury region.

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State and trends of river water quality in the Manawatū-Whanganui Region

December 2018
Analysis of river water quality state and trends for the Manawatū-Whanganui Region for the period up to 2017.

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