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Summary
The Upper Parramatta River Catchment
Trust commissioned Dr Robert Gittins to analyse ten years of water
quality data (from 1990 - 2000) at sites in the Upper Parramatta
River catchment by multivariate statistical analysis. The multivariate
analysis (MVA) is a statistical technique that combines a number
of scientific measurements into a single picture (graph). Each number
on the accompanying MVA graph is the plotted position of water quality
data for a particular consecutive month, after data for months with
appreciable rain has been excluded. Each arrow relates to a particular
water quality variables tested for, and its direction shows the
direction in which the value of that variable increases. Note how
the plotted points follow a regular pattern.
This report, prepared by Robyn Tuft & Associates,
presents a brief appreciation of the multivariate graphs in terms
of major conclusions and relevance to water quality trends, issues
of concern and catchment management implications.
Toongabbie
Creek at Redbank Road bridge, Westmead
Lake
Parramatta near the dam wall, North Parramatta
The
Parramatta River at Marsden Weir
Darling
Mills Creek at Parramatta Gaol
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