Resources
We’ve put together a summary of useful research, reports, presentations and agreements related to farming in the Lake Rotorua catchment:
The Collective AGM has held on Tuesday 2nd May 2017. Read and download the AGM Reports and minutes below:
Here you’ll find links to a selection of farm nutrient research, presentations and reports. The Collective doesn’t endorse these reports but we think they give some useful technical background to the current nutrient policy and the potential solutions.
Find out about nitrogen and phosphorus losses from Rotorua farms, ways of reducing those losses and the impact on profit.
Here you’ll find links to selection of lake research and reports. The Collective doesn’t endorse these reports but we think they give some useful technical background to the current nutrient policy and the potential solutions.
How is TLI calculated? The TLI number is calculated using four separate water quality measurements:
- total nitrogen
- total phosphorous
- water clarity
- chlorophyll
Total nitrogen and total phosphorous are nutrients that plants thrive on. Large amounts of these nutrients in the lakes encourage the growth of algae which can lead to poor water quality. Water clarity is a measurement of how clear the water in the lake is. In general, the clearer the water, the better the water quality. Chlorophyll-a is the green colour in plants. Knowing how much chlorophyll there is in a lake gives us a good idea of how much algae the lake has. The more algae present, the poorer the water quality. The Trophic Level Index combines these four measurements into one number.
| Lake | Water Quality Target | 2015/ 2016 Result | 2014/ 2015 Result | 2013/ 2014 Result | 2012/ 2013 Result | Stability |
|---|---|---|---|---|---|---|
| Rotoma | 2.3 | 2.4 | 2.5 | 2.38 | 2.36 | To be investigated |
| Tikitapu (Blue Lake) | 2.7 | 2.9 | 2.9 | 2.82 | 2.75 | Stable |
| Okataina | 2.6 | 2.8 | 2.9 | 2.69 | 2.77 | Stable |
| Tarawera | 2.6 | 3.0 | 3.1 | 3.0 | 2.94 | Declining |
| Okareka | 3.0 | 3.2 | 3.3 | 3.30 | 3.15 | Stable |
| Rerewhakaaitu | 3.6 | 3.4 | 3.3 | 3.43 | 3.5 | Stable |
| Rotoiti | 3.5 | 3.8 | 3.8 | 3.40 | 3.44 | To be investigated |
| Rotokakahi | 3.1 | 3.7 | 4.0 | 3.63 | 3.69 | To be investigated |
| Rotomahana | 3.9 | 4.0 | 4.0 | 3.8 | 3.93 | Stable |
| Rotorua | 4.2 | 4.4 | 4.4 | 4.2 | 4.24 | Stable |
| Rotoehu | 3.9 | 4.6 | 4.5 | 3.95 | 3.95 | Declining |
| Okaro | 5.0 | 4.6 | 4.5 | 4.49 | 5.42 | Improving |
| Waiora Agreement (2011) | Formalising the Collective’s working relationship with the Lakes Water Quality Society. |
| Oturoa Agreement (2013) | Facilitated by local MP Todd McLay. Led to resolving a crucial Environment Court appeal on the Proposed Regional Policy Statement. |