Intensive farming practices can discharge significant amounts of contaminants, notably nitrogen, phosphorus, sediment and pathogens into our waterways.
Wetlands are like giant kidneys protecting the health of waterways - they help dilute and filter material that could otherwise harm our lakes, rivers and other waterways. Natural wetlands have been appropriately termed as the 'kidneys of the landscape', because of their ability to store, assimilate and transform contaminants lost from the land before they reach waterways.
Wetland is a generic term for the wet margins of lakes, ponds, rivers, streams, estuaries, lagoons, bogs and swamps.
Wetlands once covered large areas of the country. Now they are some of our rarest and most at-risk ecosystems. They contain a diverse range of plants and animals and are home to many rare and threatened species that are remnants of the original biodiversity of the area.
It is estimated that about 90 per cent of New Zealand's wetlands have been drained. This is one of the largest wetland losses anywhere in the world. Wetlands now occupy only about two per cent of the country's total land area.