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Factsheets
LakeSPI
Lake Submerged Plant Indicators (LakeSPI) is a method of characterising the ecological health of lakes based on the amount of native and invasive plants growing in them. Presented as a percentage, higher LakeSPI scores are associated with the better water quality.
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Air Quality Topic
Why is air quality important?
We all need clean air Good outdoor air quality is fundamental to our well-being. On average, a person inhales about 14,000 litres of air every day, and pollutants in this air can adversely affect people’s health. People with pre-existing respiratory and heart conditions, the young, and older peop...
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Phosphorus
What is Phosphorus? Phosphorus is an element with the symbol P that attaches to soil particles and is naturally present in water in low concentrations. Together with nitrogen, it is an essential nutrient for instream plant life and is commonly measured as either total phosphorus (TP) or dissolved re...
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Air Quality Topic
Particulate matter – a source of air pollution
Particulate matter (PM) are small airborne particles composed of solid and/or liquid matter. These airborne particles are less than 10 micrometres in diameter (about a fifth of the thickness of a human hair). These include fine particles (less than 2.5 micrometres) – known as PM2.5, and coarse parti...
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Water clarity
What is water clarity? Water clarity refers to the ability of light to travel through water and has two important aspects: light penetration and visual clarity.
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Air Quality Topic
Air pollutants - gases
Gases can adversely affect our air quality and people’s health.
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Swim Smart Checklist
Water quality and conditions can change quickly. Recreating in contaminated water is a risk to human and animal health. To help keep you, your family, and dogs well this summer follow the Swim Smart Checklist below.
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Benthic macroinvertebrates
What are benthic macroinvertebrates? Benthic macroinvertebrates are small animals without backbones that live on or just below the stream-bed. Most benthic macroinvertebrates are big enough to be seen with the naked eye, and range in length from 0.25 mm to 15 cm in the case of a fully grown freshwat...
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Groundwater
Nitrate-nitrogen in groundwater
What is nitrate-nitrogen? The term ‘nitrate-nitrogen’ refers to the nitrogen portion of the total nitrate in a sample. Nitrate is a common, naturally occurring chemical compound made of the elements nitrogen (N) and oxygen (O). It is an important source of the nitrogen that is essential for plants t...
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Nitrogen
What is Nitrogen? Nitrogen is a naturally occurring chemical element, with the symbol N. In its gas form (N2), nitrogen makes up about 80% of the Earth's atmosphere. In other forms it is one of the most important nutrients for plant growth. It is also found in amino acids that make up proteins, in n...
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Groundwater
Well construction
A well is a hole that is drilled or dug into the ground to get or measure groundwater. The LAWA website contains basic information about the construction of many of the wells that regional councils use to monitor groundwater. The terms used on LAWA are described here.
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Lakes in New Zealand
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...
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