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Annual median visual clarity in rivers, 2007

Annual median visual clarity levels (metres) at the 77 national network sites, 2007

Site
Visual clarity (m)
WH1
1.79
WH2
0.99
WH3
0.50
WH4
0.63
AK1
0.70
AK2
0.67
HM1
1.66
HM2
0.49
HM3
1.14
HM4
0.75
HM5
0.76
HM6
2.07
RO1
4.76
RO2
1.00
RO3
2.25
RO4
2.03
RO5
1.90
RO6
8.37
TU1
1.51
TU2
3.15
WA1
1.02
WA2
4.93
WA3
1.47
WA4
1.01
WA5
2.40
WA6
1.20
WA7
1.32
WA8
1.72
WA9
1.21
GS1
0.28
GS2
1.98
GS3
2.40
GS4
1.21
HV1
6.40
HV2
2.88
HV3
2.68
HV4
8.55
HV5
2.10
HV6
3.50
WN1
2.99
WN2
4.34
WN3
1.68
WN4
1.04
WN5
4.35
NN1
5.44
NN2
12.93
NN3
5.78
NN4
3.23
NN5
5.65
GY1
1.25
GY2
1.93
GY3
4.53
GY4
2.01
CH1
2.38
CH2
2.49
CH3
1.55
CH4
0.36
TK1
4.07
TK2
3.55
TK3
2.91
TK4
4.49
TK5
5.24
TK6
2.01
AX1
5.21
AX2
1.91
AX3
0.54
AX4
2.15
DN1
0.97
DN2
2.60
DN3
1.08
DN4
1.54
DN5
1.00
DN6
2.28
DN7
4.25
DN8
1.64
DN9
1.99
DN10
6.20
5th percentile (all sites)
0.51
Median (all sites)
2.01
95th percentile (all sites)
6.33
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.

 

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Last updated: March 2009