TABLE OF CONTENTS
EXECUTIVE SUMMARY 1
Operations and Maintenance. 16
1. INTRODUCTION. 19
1.1 Background. 19
1.2 Goals and Objectives of Water Supply Asset Ownership. 20
1.3 BACKGROUND. 21
1.4 Plan Framework. 23
1.5 Asset Management Planning. 24
1.6 Sustainable Development 25
2. LEVELS
OF SERVICE. 28
2.1 Customer Research and Expectations 30
2.2 Water Quality. 34
3.2 Reliability. 41
3.3 Pressure. 44
3.4 Flow Rate. 48
3.5 Emergency Response. 49
3.6 Environmental 51
4. FUTURE
DEMAND. 53
4.1 Existing Situation. 53
4.2 Demand Forecast 54
4.3 Demand Management 66
4.4 Supply Capacity. 68
4.5 Extensions to the Area Supplied. 70
4.6 Future Growth. 70
4.7 Action Plan. 71
5. EMERGENCY
AND RISK MANAGEMENT. 72
5.1 Background. 72
5.2 Implementation. 72
5.3 Risk Identification, Risk Analysis and Risk Priority
Rating. 76
5.4 Risk Summary. 76
5.5 Recovery. 82
5.6 Action Plan. 83
5.7 Review. 83
5.8 Health and safety. 83
6. LIFE-CYCLE
MANAGEMENT PLANS. 84
6.1 Background Data. 84
6.2 Asset Condition and Performance Assessments 90
7. FINANCIAL. 106
7.1 Background. 106
7.2 Asset Valuation and Depreciation. 106
7.3 Operations and maintenance plan. 117
7.4 Renewal Strategy. 121
7.5 Capital Programme. 125
7.6 Asset Disposal Plan. 130
7.7 Long Term plan. 130
7.8 Funding. 130
8. ASSET
MANAGEMENT PRACTICES. 132
8.1 Asset Management 132
8.2 Information Systems 132
8.3 Accounting/Financial Systems 132
8.4 Geographical Information System.. 133
8.5 Information Flow Requirements and Processes 134
8.6 Asset Management System.. 135
8.7 Network Model 135
8.8 Condition Model 135
8.9 SCADA Telemetry. 135
9. PLAN
IMPROVEMENT AND MONITORING. 136
9.1 Previous Action Plans 136
9.2 Performance Monitoring and Management 137
9.3 Improvement Programme. 137
9.4 Monitoring And Review Procedures 138
10. ACTION
PLAN. 139
10.1 Explanation. 139
10.2 Annual Performance Monitoring. 140
LIST OF TABLES
Table
ES3: Years 1-12 of the 2015/25 Long Term
Plan- Financial Summary. 16
Table ES4: Renewals 17
Table ES5: Capital
Expenditure. 18
Table
2.1 Asset
Performance. 28
Table
2.2 Links Between
Levels of Service and Community Outcomes 29
Table
2.3 Ministry of
Health Grading Schedule. 35
Table
2.4 Demerit Points
2008 2015 grading. 37
Table
2.5 Urgent Maximum
Response Times 50
Table
2.6 Non Urgent
Maximum Response Times 51
Table
3.1 Nelson City
Population Projections 2011 2045. From Statistics New Zealand 2015 (A1393084)
.55Error! Bookmark not defined.
Table 3.2 Nelson City Population Projections 2011 2045. From Statistics New Zealand 2015 (A13930
.56Error!
Bookmark not defined.
Table 3.3 Source of Raw Water 60
Table
3.4 Peak Daily Demand. 62
Table
3.5 Total Daily Demand. 63
Table
3.6 Water Demand
Projections (Peak Day 1 in 60 year Drought) 64
Table
3.7 Current
Reservoirs 65
Table
3.8 Proposed
Reservoirs 65
Table
4.1 Likelihood
Ratings (Semi Qualitative Measure) 74
Table
4.2 Semi-Quantitative
Measures of Consequence and Areas of Impact 75
Table
4.3 Risk Priority
Rating (Semi Quantitative) 75
Table
4.4 Risk Events
Ratings (Semi-Quantitative) 76
Table
4.5 Risk Treatment
Schedule and Plan - Water Supply. 80
Table
5.1 Best Estimate
of Condition of Asbestos Cement Watermains 92
Table
5.2 Best Estimate
of Condition of Cast Iron Watermains 93
Table
5.3 Maitai
Pipeline Maintenance Schedule (over next five years) 97
Table
5.4 Reservoir Risk
Categories 102
Table
6.1 Water Supply
Asset Valuation - June 2014. 107
Table
6.2 Nominal
Working Life of Water Assets (Years) 108
Table 6.3
Assumptions
.113
Table
6.3.1 Water Supply Operation and
Maintenance Projections 120
Table
6.4 Water Supply
Renewals Projections 124
Table
6.5 Water Supply
Capital Expenditure Projections 128
Table
8.1 Previous
Action Plans Report Needs to be updated. 136
Table
9.1 Action Plan
Needs updating. 139
Table
9.2 Annual
Performance Monitoring and Reporting. 141
Table
A: Gap Analysis -
Water 157
Table B: Prioritisation Analysis of areas within the Services
Overlay for scheduling of expenditure on addressing servicing constraints
through the
Asset Management Plans and Long Term Plan. 178
Table C: Services Overlay Infrastructure Upgrade Codes 180
Table
D: Water Supply Operation and Maintenance Projections 182
Table
E: Water Supply Renewals Projections 182
Table
F: Water Supply Capital Expenditure Projections 183
LIST OF FIGURES
Figure 2.1 Residents Satisfaction with Water Supply. 33
Figure 2.3 Water Pressure Zones 52
Figure 3.1 Nelson
City Population Projections
55Error! Bookmark not
defined.
Figure 3.2 Peak
Water Demand. 61
Figure 3.3 Infrastructure Leakage Index for Nelson. 67
Figure 3.4 World Bank Banding System for Infrastructure Leakage
Index. 68
Figure 5.1 Sustainability Impact at Various Lifecycle Stages 87
Figure 5.2 Water Pipelines: Age/Material Distribution. 95
Figure 5.3 Theoretical Life Expectancy/Material Distribution. 96
Figure A Maitai Reservoir Level 148
Figure B The Water Balance Data for 2012/13 Financial Year
(latest available) 163
Figure C Sources of Water Losses 163
Figure D The Four Components of Managing Apparent Losses 168
Figure E The Four Components of Managing Real Losses 169
Figure F Plan of Infrastructure Planning for Growth in Services
Overlay Areas 176
LIST OF APPENDICES
Appendix A: Glossary
Of Terms 142
Appendix B: Water
Supply Conservation Strategy. 147
Appendix C: Lifelines 150
Appendix D: Nelson
City Council Advanced Asset Management Gap Analysis - Water 157
Appendix E: Water
Losses Evaluation. 162
Appendix F: Active
Leakage Control Plan. 170
Appendix G: Pressure
Reduction Plan Needs To Be Upgraded. 171
Appendix H: Infrastructure
Planning Process For Growth Projects 176
Appendix I: 30 Year Infrastructure Strategy. 181
Appendix J: Nelson
Water Treatment Plant Asset Management Plan (A1111654) (A717945) 185
Appendix K: Solutions
To Fire Flow Level Of Service (A706990) 193
EXECUTIVE SUMMARY Water Supply Asset Management Plan
2015-25
INTRODUCTION
This
Asset Management Plan is produced for the public water supply assets owned and
managed by the Nelson City Council and provides a 12 year outlook commencing
July 2015. The Plan identifies issues
that underpin expenditure and documents the features, risks and levels of
service associated with the effective, sustainable management of the water
supply assets.
Central
Government has signalled a likely requirement for Councils to develop an
infrastructure strategy covering the foreseeable issues associated with key
infrastructure for a 30 year future timeframe.
In
order to contribute to this strategy financial tables for the 30 year period
have been prepared for this asset management plan.
Assets included in this Plan
Nelson
City Council abstracts water from the Roding, Maitai South Branch and Maitai
North Branch Rivers for supply to approximately 20,000 customers throughout the City. A small number of
private schemes supply residents in the rural areas. The water is coarse
screened at the intakes and conveyed by raw water trunk mains to the Water
Treatment Plant at Tantragee Saddle which was commissioned in August 2004. Supply to the lower levels of Stoke and
Tahunanui is available in an emergency from Tasman District Council.
The water supply asset extends from the source
water intakes in the water catchments, to the point of supply at individual
customers property boundaries. It
includes dams, intake structures and screens, tunnels, a Water Treatment Plant,
trunk mains, secondary mains, rider mains, services, valves, hydrants,
non-return valves, pressure reducing valves, pumps, reservoirs, and water
meters.
The
replacement value (2014)
of the water supply infrastructural assets is $246.6million.
Goal of the Water Supply activity
To provide a water supply to Nelson City that
is capable of abstracting, treating and distributing potable water in an
efficient, safe, reliable and sustainable way whilst ensuring that the
ecological, recreational and cultural interests of the community in the water
sources are recognised and enhanced.
Rationale
for Councils involvement
The
Nelson City Council is the predominant supplier of reticulated water in Nelson
City. The Councils role in this area has been established since the earliest
days of the citys history.
