Figure 4.2: Summary data for conductivity and pH from the NRWQN over a 17-year period (1989-2005)
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Note: Lines, from bottom to top, correspond to values of the 5th, 20th, 50th, 80th and 95th percentiles for each year (n of sites = 77).
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This figure shows pH and conductivity trends. Mean conductivity values are stable for all rivers over time. Rivers with naturally high pH (95th percentile) have shown a negative trend (ie, rivers have become slightly less alkaline). The reason for this trend is unclear at present.
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