Options for transitioning to minimum flows and Category A - - PowerPoint PPT Presentation

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Options for transitioning to minimum flows and Category A - - PowerPoint PPT Presentation

Mar 11, 2023 249 likes •358 views

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

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SLIDE 1

Options for transitioning to minimum flows and Category A restrictions

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SLIDE 2

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?

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SLIDE 3

Staged approach to raising minimum flow – Waipoua River

240 250 260 270 280 290 300 310 320 330 340 5 10 15 20

Minimum flow (L/s) Years from now

Options for transitioning minimum flow in Waipoua River

Constant change Large change early Large change late

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SLIDE 4

Impacts of staged approach – Waipoua River

10 20 30 40 50 60 5 10 15 20

Days of cease take Years from now

Summer reliability (mean) - Waipoua River

Constant change Large change early Large change late 10 20 30 40 50 60 5 10 15 20

Days of cease take Years from now

Summer reliability (80th percentile) - Waipoua River

Constant change Large change early Large change late

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SLIDE 5

Staged approach to raising minimum flow – Upper Ruamāhanga River

2200 2400 2600 2800 3000 3200 3400 5 10 15 20

Minimum flow (L/s) Years from now

Options for transitioning minimum flow in the Upper Ruamahanga

Constant change Large change early Large change late

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SLIDE 6

Impacts of staged approach – Upper Ruamāhanga River

10 20 30 40 50 60 5 10 15 20

Days of cease take Years from now

Summer reliability (mean) - Upper Ruamahanga

Constant change Large change early Large change late 10 20 30 40 50 60 5 10 15 20

Days of cease take Years from now

Summer reliability (80th percentile) - Upper Ruamahanga

Constant change Large change early Large change late

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SLIDE 7

Improve efficiency

  • PNRP requires 80% efficiency for

irrigation

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SLIDE 8

Improve reliability

  • Attenuation
  • River management
  • Storage
  • Risk - over promise what we might

gain

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SLIDE 9

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?