Waipaoa River Flood Control Scheme Review Review Technical Review - - PDF document

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Waipaoa River Flood Control Scheme Review Review Technical Review - - PDF document

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1 Waipaoa River Flood Control Scheme Review Review Technical Review Sept 2009 Steering Committee Oct 2009 Operations Committee Oct Council February 2010 Preliminary Feedback 2 Review Existing Scheme ~ 70 Year

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1

Waipaoa River Flood Control Scheme Review

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2

Review

  • Technical Review Sept 2009
  • Steering Committee Oct 2009
  • Operations Committee Oct
  • Council February 2010
  • Preliminary Feedback
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3

Review

  • Existing Scheme ~ 70 Year
  • Up to “Bola”
  • Review includes
  • Scheme 3A

– Floodways at Lovelock & Ormond loops

  • Extension to Te Karaka (15 year)
  • Relocation Mullooly Bend Stopbank
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4

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Options

  • 100 Yr – Construct in 6 years
  • 100 Yr – Construct in 10 years
  • 150 Yr – Construct in 6 years
  • 150 Yr – Construct in 10 years
  • 200 Yr – Construct in 10 years
  • What Can be done for $1m /yr
  • What for max $300 / Hectare?
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Costs of Options

Upgrade Option Cost Total Annual Required (20 Year Loan) 100 Year (3A) (6 years) $16.9m $1,868,000 100 Year (3A) (10 years) $16.9m $1,460,000 150 Year (3A) (6 years) $24.3m $2,655,000 200 Year (3A) (6 years) $29.2m $3,065,000 <100 Year (3A) Narrower berms $12.6m $1,000,000

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Economic Benefit Assessment

  • Construction & Maintenance Economic

Benefits/Losses Over Lifetime

  • Other District Economic Benefits/Losses Over

Lifetime

  • Benefits/Losses relative to the Economic Risks
  • Overall Net Economic Benefit to District
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Economic Benefit Assessment Benefit / Cost

  • 100 Year

5.3

  • 150 Year

6.0

  • 200 Year

6.9

– Does Not Address Affordability

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Existing Rating System

  • 60 Years Old

– Soil Conservation & Rivers Control Act 1941

  • Local Govt Rating Act 2002

– “Distribution of Benefits” – “Extent contribute to the need”

  • Changes in Land Use
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Proposed Rating System

  • Direct Benefit

– 6 Categories

  • Indirect Benefit

– 3 Categories

  • Contributors
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Proposed Rating – Direct Benefit

  • Review Existing Class/Land Use
  • Depth of Flooding
  • Duration of Flooding
  • Relative Economic Benefits
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Proposed Rating – Indirect Benefit

  • The large and more diverse economy that is

sustained

  • Protection to Roads and other Transport

Facilities

  • Protection of Essential Services
  • Protection and Enhancement of Services and

Facilities used by the Wider Community.

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Proposed Rating Review - Contributors

  • Land within the Upper Catchment
  • Sediment and increased water runoff from the

catchment

  • Natural process
  • Only where the land use has altered the natural

runoff

  • MAF Assistance?
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Proposed Rating Review

  • Direct Benefit

65%

  • Indirect Benefit

20%

  • Contributors

15%

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Rating Impacts of Options

Upgrade Option Cost Total Annual Direct 65% Indirect 20% Contributors 15% 100 Year (3A) (6 years) $16.9m $1,868,000 $1,214,200 $373,600 $280,200 100 Year (3A) (10 years) $16.9m $1,460,000 $949,000 $292,000 $219,000 150 Year (3A) (6 years) $24.3m $2,655,000 $1,725,750 $531,000 $398,250 200 Year (3A) (6 years) $29.2m $3,065,000 $1,992,250 $613,000 $459,750 <100 Year (3A) Narrow Berm $12.6m $1,000,000 $650,000 $200,000 $150,000

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Direct Beneficiaries Land Areas for Class (Existing)

  • 300 ha

A class

  • 2500 ha

B class

  • 500 ha of

C class

  • 8000 ha of

D class

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Protection Level (Years) Direct

(Class D)

Indirect Contributor Per $100k (CV) or Per Hectare Per Property Per Hectare <100 ($1m per yr) $39 $22 $13.90 $1.07 100 $66 $36.50 $23.50 $1.80 150 $94 $51.50 $33.13 $2.54 200 $120 $66 $42.61 $3.27

Example

(Incls Capital & Maintenance)

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Protection Level (Years) Direct

(Class B)

Indirect Contributor Per $100k (CV) or Per Hectare Per Property Per Hectare <100 ($1m per yr) $134 $73 $13.90 $1.07 100 $225 $124 $23.50 $1.80 150 $318 $175 $33.13 $2.54 200 $409 $225 $42.61 $3.27

Example

(Incls Capital & Maintenance)

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Protection Level (Years) Direct

(Class A)

Indirect Contributor Per $100k (CV) or Per Hectare Per Property Per Hectare <100 ($1m per yr) $204 $112 $13.90 $1.07 100 $345 $190 $23.50 $1.80 150 $486 $268 $33.13 $2.54 200 $626 $344 $42.61 $3.27

Example

(Incls Capital & Maintenance)

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WAIPAOA SCHEME PEAK RATES 10yr works - $12.6 million - less than 100 yr Scheme - $ 1 million Rate r

CHANGES TO LINTON COST ETC LESS CONTRIB UTOR LESS INDIRECT TOTAL REQUIRED 15% 20% 09/10 Per $100,000 CV Per hectare Capital Value Poverty Bay Flats - existing A W1 20,909,847 100.00% 318,231,243 1,000,000

  • 150,000
  • 200,000

650,000 204 $ 112 $ Poverty Bay Flats - existing B W2 152,966,102 65.38% 134 $ 73 $ Poverty Bay Flats - existing C W3 314,823,105 38.46% 79 $ 43 $ Poverty Bay Flats - existing D W4 180,805,755 19.23% 39 $ 22 $ Poverty Bay Flats - existing E W5 536,836,364 7.69% 16 $ 9 $ Poverty Bay Flats - existing F W6 10,000,000 1.54% 3 $ 2 $ Area (ha.) Contributor CH 109,000 109,000 100% 140,800 251,400 251,400 2.83 $ Per Hectare CM 70,000 70,000 45% 1.27 $ Per Hectare CL 1,500 1,500 20% 0.57 $ Per Hectare

  • No. of properties

Indirect - Gisborne City R & U NG 12,819 12,819 100% 14,387 335,200 335,200 36.91 $ Per Property Indirect - inner Zone - PB Flats NI 1,193 1,193 100% 36.91 $ Per Property DRA3 - cummuter distance NC 1,500 1,500 25% 9.23 $ Per Property Note the above categories still include elements of 150-yr 3A $24.3 TOTAL RATE RERQUIRE D UAC - Number or properties RE LA TIV E P RO P O RTIO NS EQUIVALENT CV AREA UAC RATING CATEGORY NAME CO DE RATING BASIS AREA

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LESS CONTRIB UTOR LESS INDIRECT TOTAL REQUIRED 15% 20% 09/10 Per $100,000 CV Per hectare Capital Value Poverty Bay Flats - existing A W1 20,909,847 100.00% 318,231,243 2,655,000

  • 398,250
  • 531,000

1,725,750 542 $ 298 $ Poverty Bay Flats - existing B W2 152,966,102 65.38% 355 $ 195 $ Poverty Bay Flats - existing C W3 314,823,105 38.46% 209 $ 115 $ Poverty Bay Flats - existing D W4 180,805,755 19.23% 104 $ 57 $ Poverty Bay Flats - existing E W5 536,836,364 7.69% 42 $ 23 $ Poverty Bay Flats - existing F W6 10,000,000 1.54% 8 $ 5 $ Area (ha.) Contributor CH 109,000 109,000 100% 140,800 251,400 251,400 2.83 $ Per Hectare CM 70,000 70,000 45% 1.27 $ Per Hectare CL 1,500 1,500 20% 0.57 $ Per Hectare

  • No. of properties

Indirect - Gisborne City R & U NG 12,819 12,819 100% 14,387 335,200 335,200 36.91 $ Per Property Indirect - inner Zone - PB Flats NI 1,193 1,193 100% 36.91 $ Per Property DRA3 - cummuter distance NC 1,500 1,500 25% 9.23 $ Per Property RELATIVE PROPORTIONS TOTAL RATE RERQUIRE D 150-yr 3A $24.3 EQUIVALENT CV AREA UAC

WAIPAOA SCHEME PEAK RATES - 150yr- 3A - 6yr works $24.3 million - $300 per hectare

Note the above categories still include elements of Gisborne City direct benefit RATING CATEGORY NAME AREA UAC - Number or properties CODE RATING BASIS

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Where to?

  • Preliminary Meetings
  • Feedback
  • Report to Council
  • Council Decide on Preferred Option (or Not) for

Consultation

  • Council Decide on Preferred Rating (or Not) for

Consultation

  • Ten Year Plan 2012