Freshwater Update 78, September 2018

Freshwater Update 78 brings you the latest information from our Freshwater & Estuaries Centre, with articles that cross a broad spectrum of freshwater research, from archives to aquifers, periphyton guidance, geo-engineering and swimmability.

‘Swimmability’ of New Zealand rivers

Swimming is a popular activity in Aotearoa-New Zealand. Two attributes of waters that strongly affect aesthetic quality and safety for swimming are visual clarity and faecal contamination. It turns out that these two attributes are fairly well-correlated (inversely) in New Zealand rivers, such that (easily seen) visual clarity provides a rough-but-useful guide to (unseen) microbial quality.