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

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 • Up to “Bola” • Review includes • Scheme 3A – Floodways at Lovelock & Ormond loops • Extension to Te Karaka (15 year) • Relocation Mullooly Bend Stopbank 3

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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? 5

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

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 7

Economic Benefit Assessment Benefit / Cost • 100 Year 5.3 • 150 Year 6.0 • 200 Year 6.9 – Does Not Address Affordability 8

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 9

Proposed Rating System • Direct Benefit – 6 Categories • Indirect Benefit – 3 Categories • Contributors 10

Proposed Rating – Direct Benefit • Review Existing Class/Land Use • Depth of Flooding • Duration of Flooding • Relative Economic Benefits 11

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. 12

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? 13

Proposed Rating Review • Direct Benefit 65% • Indirect Benefit 20% • Contributors 15% 14

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

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 16

Example (Incls Capital & Maintenance) Protection Direct Indirect Contributor Level (Class D) (Years) Per $100k (CV) or Per Hectare Per Per Hectare Property <100 $39 $22 $13.90 $1.07 ($1m per yr) 100 $66 $36.50 $23.50 $1.80 150 $94 $51.50 $33.13 $2.54 200 $120 $66 $42.61 $3.27 17

Example (Incls Capital & Maintenance) Protection Direct Indirect Contributor Level (Class B) (Years) Per $100k (CV) or Per Hectare Per Per Hectare Property <100 $134 $73 $13.90 $1.07 ($1m per yr) 100 $225 $124 $23.50 $1.80 150 $318 $175 $33.13 $2.54 200 $409 $225 $42.61 $3.27 18

Example (Incls Capital & Maintenance) Protection Direct Indirect Contributor Level (Class A) (Years) Per $100k (CV) or Per Hectare Per Per Hectare Property <100 $204 $112 $13.90 $1.07 ($1m per yr) 100 $345 $190 $23.50 $1.80 150 $486 $268 $33.13 $2.54 200 $626 $344 $42.61 $3.27 19

WAIPAOA SCHEME PEAK RATES 10yr works - $12.6 million - less than 100 yr Scheme - $ 1 million Rate r CHANGES TO LINTON COST ETC LESS P RO P O RTIO NS RE LA TIV E TOTAL CONTRIB LESS TOTAL 150-yr 3A $24.3 UAC - CO DE UTOR INDIRECT REQUIRED RATE EQUIVALENT RATING CATEGORY NAME RATING BASIS AREA Number or RERQUIRE CV Per properties D AREA $100,000 Per hectare 15% 20% UAC 09/10 CV 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 Note the above categories still include elements of 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 N I 1,193 1,193 100% $ 36.91 Per Property DRA3 - cummuter distance NC 1,500 1,500 25% $ 9.23 Per Property 20

WAIPAOA SCHEME PEAK RATES - 150yr- 3A - 6yr works $24.3 million - $300 per hectare LESS PROPORTIONS 150-yr 3A $24.3 CONTRIB LESS TOTAL RELATIVE TOTAL UAC - UTOR INDIRECT REQUIRED CODE RATE RATING CATEGORY NAME RATING BASIS AREA Number or EQUIVALENT RERQUIRE Per properties CV D $100,000 Per hectare AREA CV 15% 20% UAC 09/10 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 Note the above categories still include elements of Gisborne City direct benefit Area (ha.) Contributor CH 109,000 109,000 100% 140,800 251,400 251,400 Per Hectare $ 2.83 CM 70,000 70,000 45% $ 1.27 Per Hectare CL 1,500 1,500 20% Per Hectare $ 0.57 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 N I 1,193 1,193 100% $ 36.91 Per Property DRA3 - cummuter distance NC 1,500 1,500 25% $ 9.23 Per Property 21

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 22