Skip to main content.

Annual median dissolved oxygen levels in rivers, 2007

Annual median dissolved oxygen levels (% saturation) at the 77 national network sites, 2007

Site
Dissolved oxygen (% saturation)
WH1
96.2
WH2
100.9
WH3
94.7
WH4
91.9
AK1
88.7
AK2
77.4
HM1
98.2
HM2
92.0
HM3
106.4
HM4
98.9
HM5
91.6
HM6
103.8
RO1
106.2
RO2
79.3
RO3
103.6
RO4
102.9
RO5
106.9
RO6
102.8
TU1
107.9
TU2
100.7
WA1
101.4
WA2
100.7
WA3
105.1
WA4
99.6
WA5
101.1
WA6
102.2
WA7
99.2
WA8
101.6
WA9
106.0
GS1
104.7
GS2
103.6
GS3
102.0
GS4
100.7
HV1
97.3
HV2
121.2
HV3
107.7
HV4
98.0
HV5
109.5
HV6
100.4
WN1
100.0
WN2
101.0
WN3
97.7
WN4
100.4
WN5
100.9
NN1
102.5
NN2
100.2
NN3
100.4
NN4
106.0
NN5
99.7
GY1
99.6
GY2
102.2
GY3
102.4
GY4
99.2
CH1
102.4
CH2
102.4
CH3
100.4
CH4
101.2
TK1
100.2
TK2
99.4
TK3
97.0
TK4
99.6
TK5
103.4
TK6
102.9
AX1
111.0
AX2
102.4
AX3
102.7
AX4
102.0
DN1
98.2
DN2
97.6
DN3
100.5
DN4
100.8
DN5
96.1
DN6
98.0
DN7
98.2
DN8
102.1
DN9
104.5
DN10
101.7
5th percentile (all sites)
91.7
Median (all sites)
100.9
95th percentile (all sites)
107.8
Note: Hazen method used to calculate 5th and 95th percentiles.
Data source: compiled by the Ministry for the Environment using data collected by the National Institute of Water and Atmospheric Research (NIWA).

This data comes from the National River Water Quality Network which is operated by NIWA with funding from the Foundation for Research, Science and Technology.

You can access the national network data for 2007, as well as more site information, in this spreadsheet.

 

Return to the visual clarity in rivers page.

Last updated: March 2009