Publication Search
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October 2014This report provides recommendations for new sites to improve representativeness in the New Zealand river environmental monitoring network. Read more -
May 2019This report outlines recommended changes to the ‘Interim New Zealand Guidelines for Cyanobacteria in Recreational Fresh Waters’. Read more -
May 2020This is the first of two Infometrics reports providing Māori economic impact analysis for the Essential Freshwater proposals. Read more -
May 2020This is the second of two Infometrics reports providing Māori economic impact analysis for the Essential Freshwater proposals. Read more -
March 2009This report summarises changes in fish communities in New Zealand rivers, including changes in relation to different land uses. Read more -
September 2019This report describes modelling of several urban development scenarios and their variable effect on sediment yield during construction. Read more -
December 2017This report analyses the state of freshwater quality for the past 25 years based on a national scale model. Read more -
July 2009This report summarises changes in nuisance periphyton (algal) growth at National River Water Quality Network sites between 1990 and 2006. Read more -
July 2019This report provides guidelines for the delineation of drinking water source protection zones including specifications for a ‘default’ national approach. Read more -
April 2019This report summarises analysis methods and outcomes for state and trends across New Zealand’s lake water quality monitoring network. Read more -
April 2019This report summarises analysis methods and outcomes for state and trends across New Zealand’s river water quality monitoring network. Read more -
April 2019This report summaries the published literature on land-use impacts on New Zealand's freshwater and coastal environments. Read more -
June 2016This report presents the findings of a review of national and international literature on benthic cyanobacteria and their associated toxins. Read more -
May 2010The purpose of this report is to assist, from a science perspective, with developing knowledge about setting limits in water management. Read more -
July 2006This report investigates approaches for the allocation and subsequent reallocation of water in New Zealand, including situations of over-allocation. Read more -
May 2019This report provides information on the susceptibility to eutrophication of coastal water bodies to nutrient loads from fresh water. Read more -
May 2019This report analyses seasonal patterns in river and lake water quality across New Zealand, using data from 2013–2017. Read more -
November 2006This report provides a snapshot of lake water quality and lake water quality monitoring in New Zealand between and 1995 and 2005. Read more -
May 2019This report summarises a workshop held to gather feedback on the ‘Interim New Zealand Guidelines for Cyanobacteria in Recreational Fresh Waters’. Read more -
July 2014This report describes an economic model of the economic consequences of meeting water quality objectives in the Upper Waikato sub-catchment. Read more -
November 2013This technical report summarises the outcomes of the ‘Periphyton Science Panel’ deliberations to define a periphyton attribute for ecosystem health in rivers. Read more -
May 2020This memo sets out a technical review by NIWA of two reports relating to environmental impact assessment of Essential Freshwater policies. Read more -
May 2020This NIWA report summarises existing literature on the consequences of delaying reductions to nutrient inputs on rivers, estuaries and lakes. Read more -
May 2019This report presents and tests a macroinvertebrate metric for New Zealand streams and rivers that is sensitive to changes in flow. Read more -
August 2010The report updates an analysis of trends in water quality between 1989 and 2003 which was summarised in Environment New Zealand 2007. Read more -
May 2020This report uses a kaupapa Māori framework to assess the impacts of the 2019 freshwater proposals on Māori values relating to freshwater Read more -
May 2020This report identifies the expected benefits of the Essential Freshwater Package and examines whether they can be measured in monetary terms. Read more -
September 2019This report describes hydrological modelling that estimates the suspended sediment load reductions required to meet proposed suspended sediment attribute bottom lines. Read more -
September 2019This report describes the final stage of a multi-year research programme to develop thresholds for in-stream suspended and deposited sediment. Read more -
April 2017This report looks at the state and trends of water quality in urban streams, with a focus on Auckland, Wellington and Christchurch. Read more -
May 2019This report outlines the different potential approaches for characterising the pressure created by dams on the flow regime of rivers and streams. Read more -
November 2004This report provides a regional perspective on the costs and benefits of various allocation scenarios for use of water from the Waitaki Catchment. Read more -
September 2019This report describes remote sensing imagery analysis that identifies areas of winter forage cropping and evaluates devegetation that results from winter grazing. Read more -
November 2013This technical report provides evidence and advice used in setting the E. Coli attribute bands for secondary contact recreation in rivers and lakes. Read more -
September 2019This report sets out an economic analysis of modelled assessments of four potential options for managing the effects of farming on freshwater. Read more -
November 2013This technical report summarises the outcomes of the ‘Cyanobacteria Science Panel’ deliberations to define a secondary contact recreation cyanobacteria attributes for rivers and lakes. Read more -
Further analyses of fine sediment attributes to support development of the NPS freshwater managementMay 2020These six technical reports detail analysis used to finalise the suspended and deposited sediment attributes for the National Policy Statement for Freshwater Management. Read more -
May 2020This Castalia report estimates the administrative costs imposed under the Action for healthy waterways package for New Zealand’s 16 regional councils. Read more -
May 2020This report assesses the costs of the Essential Freshwater Package relative to the existing National Policy Statement for Freshwater Management. Read more -
May 2020This report presents research conducted by Lincoln University on the willingness to pay for the various attributes associated with New Zealand’s green premium. Read more -
July 2019This report describes the methodology and findings of an assessment of the potential impacts of national implementation of drinking water source protection zones. Read more -
March 2008This report provides scientific guidelines for the selection of methods to determine ecological flows and water levels for rivers, lakes, wetlands, and groundwater resources. Read more -
May 2019This report refines and updates 2011 modelling on suspended sediment loads across New Zealand with new and longer calibration datasets and updated predictors. Read more -
April 2020This report by Cawthron collates and analyses regional council river and stream monitoring data, including measures of fine deposited sediment and habitat quality. Read more -
May 2020This report summarises work to evaluate load reductions required to meet the new National Policy Statement for Freshwater Management's nutrient-related bottom lines. Read more -
October 2019This NIWA consultant report provides analysis of state and trends in a number of water quality variables in urban rivers and streams in New Zealand. Read more -
May 2001This project report aimed to clarify problems in existing water allocation practice, provide suggestions at the strategic level for improvement, and identify roles and responsibilities. Read more -
December 2020This report surveyed international frameworks, identified important lessons for outcome-based environmental management, and helps clarify what setting environmental limits and targets will require. Read more -
May 2020This AgResearch report presents insights on the potential nature of social impacts emerging from freshwater policy changes based on past social impact assessments (SIAs). Read more -
May 2019This report presents and tests a range of macroinvertebrate metrics for New Zealand streams and rivers that are sensitive to changes in sediment and periphyton. Read more