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A review of short-term management options for Lakes Rotorua and Rotoiti

Acknowledgements

About the author

Executive summary

Summary of recommendations

1 Purpose and methodology

2 Welcome to Rotorua

3 Leadership and responsibility for lakes management - Environment Bay of Plenty and Rotorua District Council

4 Whole systems understanding and adaptive management

5 A short history of monitoring and investigations and the implications for management

6 Recommendations for short-term management measures and better systems understanding

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

Appendix 2: Yearly average TLI values for the Rotorua district lakes in comparison to the tli values set in the regional water and land plan

Appendix 3: Lakes Rotorua and Rotoiti - system dynamics and adaptive management

Appendix 4: Lake Rotorua nutrient inputs and water quality - loads and targets 1965-2002

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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.

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