12 June 2018
Freshwater Update 77 brings you the latest information from our Freshwater & Estuaries Centre, with articles that cross a broad spectrum of freshwater research from weed eradication and species traits, to clear springwater, wastewater, and irrigation.
In this issue
Success – weed eradication from a Northland lake
Early detection leads to successful lake-wide eradication of a freshwater pest plant, highlighting the value of long-term research with Northland Regional Council.
A clearer look at Te Waikoropupū Springs
Te Waikoropupū Springs near Takaka are the largest freshwater springs in New Zealand, the largest cold-water springs in the Southern Hemisphere, and are nationally and internationally valued for their remarkable colour and clarity.
Good practice guide for waste stabilization ponds: design and operation
Water New Zealand has recently published an update and expansion of the old Ministry of Works Guidelines for Oxidation Ponds 1974.
Freshwater macroinvertebrate trait database updated
There is growing interest in the use of freshwater macroinvertebrate species traits as an assessment tool for monitoring human impacts on stream ecosystems, but what exactly is a species trait?-
Water storage solutions for irrigation schemes
Demand for water has intensified over the past two decades at a phenomenal rate in New Zealand. Most easy-to-abstract direct run-of-stream resources (i.e. flows without existing upstream modification) are already highly allocated in many regions. 
Use of stable isotopes in rainfall and rivers to explain pathways and speed of water movement through catchments
Stable hydrogen and oxygen isotopes in rainfall and rivers can provide a powerful tool to explain the pathways and speed of water movement through catchments.
Irrigation Insight
The Irrigation Insight programme is focussed on developing knowledge, tools and the confidence of dairy farmers in better managing irrigation, precisely applying the water needed—where, when and how much.