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The Opuha Dam

The Opuha Dam. What Next ?. Opuha Dam Project. Where did Opuha Dam originate from ? Opuha site selected ECNZ withdrew in favour of Alpine Energy Agreement to construct entered into in 1995 Construction started late 1995 Dam breach occurred February 1997 Dam commissioned November 1998

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The Opuha Dam

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  1. The Opuha Dam What Next ?

  2. Opuha Dam Project • Where did Opuha Dam originate from ? • Opuha site selected • ECNZ withdrew in favour of Alpine Energy • Agreement to construct entered into in 1995 • Construction started late 1995 • Dam breach occurred February 1997 • Dam commissioned November 1998 • April 2007 Opuha Water Partnership

  3. The Opuha Dam: “Strong relationships between Local Iwi, Fish & Game, D.O.C., District Councils, ECAN and Irrigators”

  4. Opuha Dam • Priority of Water Releases 370 – 391.2m • 1st Environmental Flow • 2nd Domestic Use and Stock water • 3rd Irrigation • 4th Electricity Generation • Above 391.2m Generation Discretion • Generator • Capacity 7 mega watts driven by 15 cumec • Maximum Generation Month 360k • Minimum Generation 0 • In an average year the generator will operate for 55% of the time • Dam is operated by Contact Energy at Clyde – manned 24/7

  5. Opuha Dam • 50m High 330 metres long • Maximum operating level 392.2m above sea level • Command area, 16000ha with 92% reliability • Storage is 91 million cubic metres • Lake at 392.2m is 710 Hectares • Minimum Operating Level 370m • It is expected that one year in 20 the lake will lower to 370m • 50% of Water in storage is for Irrigation and 50% is for Irrigation

  6. Managing OpuhaDaily Management Inspection Observation • Dam Safety – 24 hours • Flow Releases – 24 hours • Environmental Monitoring – 24 hours • Irrigation Output – Water orders daily • Lake Levels – Low and High as required

  7. Costs to Opuha AnnuallyCompliance • Administration $120k • Monitoring Charges $56k • Telemetry Charges $42k • Site Inspection $45k • Safety Management $100k • River Management $160k

  8. Audited Self Management • Opportunity to Integrate Management with Individual Compliance • What are the Hurdles • Trust – Community, individuals, NGO’s, Ecan • Knowledge – Not all have the ability to standalone and manage • OWP has an infrastructure to manage so can do more • OWP is interested in taking cost out and improving performance • Ecan are interested in allowing autonomy • What are the instruments required to give OWP authority to manage

  9. What Does Integrated Consent Management look like? • New arrangements need support • Communities need to be happy and involved • Communities need to trust and influence • Regional Authority needs to trust • Institutional arrangements • Based around consent conditions that point to a civil contract eg OWP affiliation • How do you involve the community in the contract • What rules do you have? • What behavioural tools do you get to use?

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