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Figure 10.9: Trends in dissolved oxygen and water temperature in rivers in the national monitoring network, 1989–2005

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Notes:

(1) Different scales are used for dissolved oxygen and water temperature.

(2) mg/L = milligrams per litre.

Source: Adapted from Ministry for the Environment, 2006d.

Text description of figure

 

Median dissolved oxygen
(mg/L)

Median water temperature
(mg/L)

1989

100.55

12.9

1990

100.75

12.3

1991

101

11.3

1992

101

11.35

1993

101.5

11.9

1994

100.8

11.7

1995

100.7

12.15

1996

100.75

11.9

1997

100.75

11.3

1998

100.75

12.55

1999

100.65

12.55

2000

100.3

11.95

2001

100.7

13.05

2002

100.9

12.1

2003

101.05

12.3

2004

100.6

12

2005

100.65

12.9