New Zealand Journal of Marine and Freshwater Research abstracts

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New Zealand's National River Water Quality Network 1. Design and physico-chemical characterisation

DAVID G. SMITH

NIWA-Ecosystems
National Institute of Water and Atmospheric
Research Ltd
P. O. Box 11-115
Hamilton, New Zealand

RUURD MAASDAM

Water Authority Friesland
P. O. Box 36
8900 AA Leeuwarden
The Netherlands

Abstract  The first 2 years of monthly-sampled physico-chemical data from 77 river and stream sites in New Zealand's National River Water Quality Network are summarised. The data for the major ions, pH, dissolved oxygen, conductivity, clarity, temperature, and NO3-N from the majority of sites are normally distributed. The data for flow, BOD5, turbidity, absorption coefficients, and total and dissolved nutrients (except for NO3-N) from most sites are positively skewed. Combined data for all sites are compared with water quality standards and criteria, and "average" world freshwater concentrations. The vast majority of samples are well within accepted standards and criteria for a variety of river water uses and the waters can be classed as being of relatively low ionic strength.

Keywords  water quality; statistics; exploratory data analysis; standards; criteria; network; periphyton

PDF file of entire paper: medium quality (1126K); (scanned from paper original: notes about this process)

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