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May 2019This report updates previously published statistics on water consented to be taken from surface and groundwater sources for consumptive uses (such as irrigation or drinking water). Read more -
April 2019This report summarises analysis methods and outcomes for modelling nitrate-nitrogen leaching from livestock in New Zealand, from 1990 to 2017. Read more -
May 2019This report recommends river habitat modification indicators that can be used for national environmental reporting under the Environmental Reporting Act. Read more -
May 2019This report recommends river biodiversity and ecosystem process impact indicators that can be used for national environmental reporting under the Environmental Reporting Act. Read more -
September 2019This report builds upon the findings of the Sediment attributes and urban development (report 1) literature review - see link in Related publications below. Read more -
April 2019This report summarises analysis methods and outcomes for modelling New Zealand’s river water quality. Read more -
April 2019This report summarises analysis methods and outcomes for modelling New Zealand’s lake water quality. Read more -
September 2019This data report provides an annual data picture of brassica grown in New Zealand. Read more -
May 2019This report develops a model predicting the reference state for stream macroinvertebrates across New Zealand. Read more -
May 2019This report analyses environmental conditions that cause the growth of periphyton in streams and rivers. Read more -
September 2019This report provides a cost-benefit assessment of potential interventions to meet proposed suspended sediment attribute bottom lines. Read more -
May 2019This report provides information to help interpret trends in water quality of New Zealand’s lakes and rivers. Read more -
May 2019This report outlines recommended changes to the ‘Interim New Zealand Guidelines for Cyanobacteria in Recreational Fresh Waters’. Read more -
September 2019This report describes modelling of several urban development scenarios and their variable effect on sediment yield during construction. 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 -
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 -
May 2019This report summarises a workshop held to gather feedback on the ‘Interim New Zealand Guidelines for Cyanobacteria in Recreational Fresh Waters’. 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 -
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 -
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 -
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 -
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 -
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 -
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 -
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 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 -
September 2019This report summarises existing literature reviews on the effectiveness of erosion and sediment control interventions for agriculture and reviews factors of variation in their effectiveness. Read more -
September 2019This report reviews New Zealand literature on the effects of environmental degradation of freshwater ecosystems on social, cultural, environmental, and economic outcomes in New Zealand. Read more -
September 2019This report provides a review of alternative, and potentially complementary, frameworks for the integrated assessment of the economic, environmental, and socio-cultural effects of environmental management. Read more -
September 2019This report analyses water quality data to assess the effect of urban development on in-stream indicators of suspended fine sediment, primarily turbidity and total suspsended sediment. Read more -
September 2019This report examines how potential rules in a national environmental standard would impact the agricultural sector in terms of farm economics, and nitrogen and phosphorus discharges to water. Read more -
May 2019This report examines whether measures of the macroinvertebrate community can provide information on the health of the trout populations that feed on them, based on existing data. Read more -
September 2019This draft NIWA report provides the first attempt to develop bottom-line thresholds for suspended and deposited sediment based on ecological responses for New Zealand rivers and streams. Read more -
May 2019This report reviews how mechanistic (process-based) models simulate periphyton biomass using algorithms describing known growth and loss processes based on nutrients, light, temperature, grazing, and physical factors. Read more -
May 2019This report characterises the pressure on surface water flows from actual water takes for the Horizons (Manawatu-Wanganui) and Greater Wellington regions in the lower half of the North Island. Read more -
September 2019This report from ESR describes the methodology and findings of an assessment of changes in levels of compliance with the Drinking-water Standards for New Zealand (DWSNZ) from 2005 to July 2017. Read more -
September 2019This report sets out the results of a modelling exercise that assessed the potential economic impacts of meeting a range of contaminant loads and attributes states for nitrogen, phosphorus, and sediment in the Ruamahanga catchment in Wairarapa. Read more -
September 2019This literature review assesses the primary sources of variability in sediment generation in an urban environment and the impact of urban development on sediment discharges in the short and long term. Read more