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New Zealand Lakes Lakes are localised bodies of water that are surrounded by land. They may be fed by, or feed into rivers or may be maintained by rainfall and groundwater inputs. Lakes exist in all shapes and sizes and may be natural (for example formed by glaciation or landslides) or man-made (for...

Why monitor groundwater? Groundwater changes over time. Groundwater levels rise and fall as the seasons change, and in response to heavy rainfall and groundwater use. Groundwater quality can also respond to changes in the seasons and to rainfall events, as well as to changes in land use. By monitori...

The NRWQN (National River Water Quality Network) consists of 77 sites on 35 rivers that are fairly evenly distributed over the two main islands of New Zealand. Monitoring commenced in January 1989. Water samples are collected monthly and analysed for a range of physical and chemical parameters (i.e....

The State and Trend values are two key measures to analyse the performance of environmental indicators over a particular area or site. State shows the current condition of the indicator being measured (e.g. E. coli  for water quality) and the trend shows how the indicator is tracking over time. View...