Options for transitioning to minimum flows and Category A restrictions
Principles from the last workshop • No immediate changes • Staged approach to raising minimum flows • Incentivise efficiency • Improve reliability • Review effectiveness after 10 years – Category A restrictions?
Staged approach to raising minimum flow – Waipoua River Options for transitioning minimum flow in Waipoua River 340 330 320 Minimum flow (L/s) 310 300 290 280 270 260 250 240 0 5 10 15 20 Years from now Constant change Large change early Large change late
Impacts of staged approach – Waipoua River Summer reliability (80th percentile) - Summer reliability (mean) - Waipoua Waipoua River River 60 60 50 50 Days of cease take Days of cease take 40 40 30 30 20 20 10 10 0 5 10 15 20 0 5 10 15 20 Years from now Years from now Constant change Large change early Large change late Constant change Large change early Large change late
Staged approach to raising minimum flow – Upper Ruamāhanga River Options for transitioning minimum flow in the Upper Ruamahanga 3400 3200 Minimum flow (L/s) 3000 2800 2600 2400 2200 0 5 10 15 20 Years from now Constant change Large change early Large change late
Impacts of staged approach – Upper Ruamāhanga River Summer reliability (80 th percentile) - Upper Summer reliability (mean) - Upper Ruamahanga Ruamahanga 60 60 50 50 Days of cease take Days of cease take 40 40 30 30 20 20 10 10 0 0 0 5 10 15 20 0 5 10 15 20 Years from now Years from now Constant change Large change early Large change late Constant change Large change early Large change late
Improve efficiency • PNRP requires 80% efficiency for irrigation
Improve reliability • Attenuation • River management • Storage • Risk - over promise what we might gain
Review effectiveness after 10 years • Set policy direction now: directly connected groundwater takes move to cease take at minimum flows • Review effectiveness of actions over 10 years • Ask, do you now restrict Category A?
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