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Appendix 1: Comparison of TLI values for the Rotorua district lakes

Lake

Observed TLI 2001
TLI units

Observed TLI 2002
TLI units

PAC value 2002
% per year

Long-term trend
In terms of TLI units

Okaro*

5.72 ± 0.10

NS

   

Rotorua

4.63 ± 0.07

4.66 ± 0.07

0.69

No change

Rotoehu

4.67 ± 0.05

4.67 ± 0.05

1.03

No change

Rotoiti

NS

3.87 ± 0.05

0.27

No change

Okareka

3.24 ± 0.09

3.23 ± 0.09

0.00

No change

Rotomahana*

3.77 ± 0.09

NS

   

Rerewhakaaitu

3.63 ± 0.11

3.60 ± 0.11

0.23

No change

Rotoma*

2.36 ± 0.12

NS

   

Okataina

NS

2.70 ± 0.06

1.51

No change

Tarawera

NS

2.69 ± 0.06

0.75

No change

Tikitapu

NS

2.84 ± 0.13

0.94

Probable degradation

Rotokakahi**

3.25 ± 0.05

     

* Not sampled in either the period 1 July 2000 to 30 June 2001 or the period 1 July 2001 to 30 June 2002.

** Historical data.