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River Environment Classification
The River Environment Classification (REC) is a database of catchment spatial attributes, summarised for every segment in New Zealand's network of rivers. -
Identification and e-guides
Downloadable and printable guides on identification of common freshwater invertebrates found in New Zealand waterways and lakes. -
Suspended-sediment yield estimator
This national GIS ‘layer’ enables reconnaissance-scale estimation of suspended-sediment yields from New Zealand’s rivers and streams. It has been developed by NIWA in collaboration with Landcare Research. -
Water take
Water take (also known as water abstraction) has a range of valuable public and private uses. -
Piharau
Piharau/kanakana are an important mahinga kai species and a prized delicacy for many Māori. -
Urbanisation activities
Urbanisation has changed the face of many waterways that flow through urban areas -
Sediment and agriculture
How may agricultural activities increase sediments in waterways? -
Chemical contamination
Chemical contaminants are chemicals toxic to plants and animals in waterways. -
Cropping activities
The land used to produce crops is usually flat to gently rolling so it can be tilled, sowed, and harvested. -
What do we measure?
Research ProjectA range of physical and chemical variables are measured in the NRWQN. -
Algal monitoring service
ServiceBlooms of hazardous cyanobacteria (blue-green algae) in rivers, lakes and reservoirs can cause problems for both animal and human health. -
Altered water flow (hydrology)
Each waterway has its own particular characteristics relating to water flow, velocity, and quantity.
