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Measuring Water Quality

Andriy Medvediuk - 123RF

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How will we know if the actions people all over Aotearoa are taking to improve the health of our freshwater are working? Our research is striving to fill data gaps and build knowledge about how to measure and model water quality.

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Journal Article

Estimation of Catchment Nutrient Loads in New Zealand Using Monthly Water Quality Monitoring Data

Causes of variation between nutrient loads estimated using alternative calculation methods and their repeatability were investigated using 20 years of daily flow and monthly concentration…
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Journal Article

Estimation of nutrient loads from monthly water quality data

Causes of variation between loads estimated using alternative calculation methods and their repeatability were investigated using 20 years of daily flow and monthly concentration samples…
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Technical Report

Predicting Land-Based Nitrogen Loads and Attenuation in the Rangitikei River Catchment – the model development

We investigated and developed a simple model to account for the influence of different soil types and underlying geology on the transformation of nitrogen (N)…
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Journal Article

Denitrification potential in the subsurface environment in the Manawatu River catchment

Understanding the effects of hydrogeological factors on loss, transport and fate of farm nutrients is essential for predicting their impacts on ecosystem health of receiving…
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Presentation

Benign denitrification in the subsurface environment

Our Land and Water Symposium, April 2017
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Journal Article

Predicting improved optical water quality in rivers resulting from soil conservation actions on land

Soil conservation not only conserves soil but it improves the water clarity of water in rivers. This improvement may be estimated by the methods shown…
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Technical Report

Interoperable Models for Land and Water Framework selection and preliminary design

This report presents a proposal for the development of an interoperable modelling system suitable for integrated spatial assessment the economic, production and environmental implications of…
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Journal Article

Optimizing land use for the delivery of catchment ecosystem services

Despite widespread implementation of best management practices, sustainable farming is neither practical nor possible in certain locations, where protecting water quality and promoting agricultural production…
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Journal Article

Assessing the Yield and Load of Contaminants with Stream Order: Would Policy Requiring Livestock to Be Fenced Out of High-Order Streams Decrease Catchment Contaminant Loads?

This paper won the JEQ Best Paper Award 2019. Concentration and flow data for 1998 to 2009 were used to calculate catchment load and yields…
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Presentation

The missing link to better target on-farm practices to address water quality?

Public lecture, Lincoln University, September 2017
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Journal Article

Anthropogenic increases of catchment nitrogen and phosphorus loads in New Zealand

Spatial regression models were used to predict yields of nitrogen (N) and phosphorus (P) discharged from catchments throughout New Zealand. The models were derived using…
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Journal Article

Transport and potential attenuation of nitrogen in shallow groundwaters in the lower Rangitikei catchment

Intensive agricultural activities are generally associated with nitrogen leaching from agricultural soils with potential to contaminate groundwater and surface waters. We studied nitrogen losses and…
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