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Duvauchelle Wastewater Project Overview of Scheme Options
Presentation to the Ngāi T ahu Parties Thursday 20th S eptember 2018
Duvauchelle Wastewater Project Overview of Scheme Options - - PowerPoint PPT Presentation
Duvauchelle Wastewater Project Overview of Scheme Options - - PowerPoint PPT Presentation
Duvauchelle Wastewater Project Overview of Scheme Options Presentation to the Ng i T ahu Parties Thursday 20 th S eptember 2018 Consent History Plant commissioned in 1985 Current short term consent granted 31 J anuary 2011
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Consent History
- Plant commissioned in 1985
- Current “short term” consent granted 31 J
anuary 2011
- Expires 28 J
anuary 2023
- Working Party set up in 2011
- M et 14 times – now coming towards a solution
- Consent conditions - milestones
- Working Party to report on Options by 31 October 2016 (done)
- Working Party to report on “referred” option by 31 October 2018 (done)
- Report on proposed implementation program, consenting, construction and
- peration by 31 October 2020
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Options Considered
- Continued Harbour Discharge
- Discharge to Land (reuse)
- 5 possible land application sites considered
- Criteria - land slope < 15 degrees
- Proximity to plant.
- Site 1 and 3 best options
- Storage of winter volume required
Land discharge is technically feasible
therefore harbour discharge will be very difficult to consent
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13/ 12/ 2016 2
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13/ 12/ 2016 4
Control (no irrigation)
440 mm/yr 825 mm/yr 1650 mm/yr
2 4 6 8 10 12 14 D control D 440 D 825 D 1650 A control A 825 Dry matter production (t/ ha/ yr equiv.)
Wastewater accelerates pasture growth
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Native Tree Growth Trial using Duvauchelle Treated Wastewater Lincoln University October 2014 T
- February 2018
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Golf Club and Show Grounds Irrigable Areas
Drainage Class Operating Regime Drainage Area (ha)
Good All year Good 5.0 Moderate S ummer + shoulder only Moderate 2.5 Poor S ummer only Poor 3.4 T
- tal assumed irrigable area
10.9
- Any land > 15 degrees is excluded
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Duvauchelle Wastewater S cheme Options
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Rough Order Capital Cost Estimate
Option Rough Order Capital Cost
Options 1 - 3 $4.0M - $5.0M Option 4 $3.3 - $4.2M
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Option 2 photomontage
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Option 4 Photomontage – Covered Vs Uncovered Pond
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Next Steps
- Community Information meeting(s)
- Further develop preferred option(s) and costs
- Review implications of Akaroa bore injection work for Duvauchelle scheme
- Report to Council for a decision on preferred option
- Prepare and lodge consent application
- Report on proposed implementation timeframe