Nelson City Council Water Supply Asset Management Plan 2012-2022 Nelson City Council Water Asset Management Plan 2012-2022 1142397 2 Nelson City Council WATER SUPPLY Asset Management Plan 2012-2022 Author: Phil Ruffell, Principal Adviser Utilities and Chloe Light, Engineering Adviser Review and Approval: Michael Schruer Executive Manager Strategy and Planning Adopted: Council Meeting 20 September 2012 Version Information Version 1 Draft Version Date August 2011 Version 2 Final Version Date August 2012 Cover Photos: 375mm diameter Butterfly Valve Stoke High Level Reservoir Nelson City Council Water Asset Management Plan 2012-2022 1142397 4 Nelson City Council TABLE OF CONTENTS EXECUTIVE SUMMARY .......................................................................................... 1 1. INTRODUCTION ................................................................................... 13 1.1 Background ....................................................................................................... 13 1.2 Goals and Objectives of Water Supply Asset Ownership .......................................... 14 1.3 BACKGROUND ................................................................................................... 15 1.4 Plan Framework ................................................................................................. 17 1.5 Asset Management Planning ................................................................................ 18 1.6 Sustainable Development .................................................................................... 19 2. LEVELS OF SERVICE ............................................................................ 22 2.1 Customer Research and Expectations ................................................................... 23 2.2 Water Quality .................................................................................................... 26 2.3 Reliability .......................................................................................................... 31 2.4 Pressure ........................................................................................................... 33 2.5 Flow Rate .......................................................................................................... 36 2.6 Emergency Response .......................................................................................... 38 2.7 Environmental ................................................................................................... 39 3. FUTURE DEMAND ................................................................................. 42 3.1 Existing Situation ............................................................................................... 42 3.2 Demand Forecast ............................................................................................... 43 3.3 Demand Management ......................................................................................... 50 3.4 Supply Capacity ................................................................................................. 53 3.5 Extensions to the Area Supplied ........................................................................... 54 3.6 Future Growth ................................................................................................... 55 3.7 Action Plan ........................................................................................................ 55 4. EMERGENCY AND RISK MANAGEMENT ................................................. 56 4.1 Background ....................................................................................................... 56 4.2 Implementation ................................................................................................. 56 4.3 Risk Identification, Risk Analysis and Risk Priority Rating ........................................ 59 4.4 Risk Summary ................................................................................................... 59 4.5 Recovery........................................................................................................... 63 4.6 Action Plan ........................................................................................................ 64 4.7 Review ............................................................................................................. 64 4.8 Health and safety ............................................................................................... 64 5. LIFE-CYCLE MANAGEMENT PLANS ....................................................... 65 5.1 Background Data ............................................................................................... 65 5.2 Asset Condition and Performance Assessments ...................................................... 70 6. FINANCIAL .......................................................................................... 84 6.1 Background ....................................................................................................... 84 6.2 Asset Valuation and Depreciation ......................................................................... 84 6.3 Operations and maintenance plan ........................................................................ 91 6.4 Renewal Strategy ............................................................................................... 94 6.5 Capital Programme ............................................................................................. 98 6.6 Asset Disposal Plan ........................................................................................... 102 6.7 Long Term plan................................................................................................. 102 6.8 Funding ........................................................................................................... 102 Water Asset Management Plan 2012-2022 1142397 i Nelson City Council 7. ASSET MANAGEMENT PRACTICES ...................................................... 104 7.1 Asset Management ............................................................................................ 104 7.2 Information Systems ......................................................................................... 104 7.3 Accounting/Financial Systems ............................................................................. 104 7.4 Geographical Information System ....................................................................... 105 7.5 Information Flow Requirements and Processes ...................................................... 106 7.6 Asset Management System ................................................................................ 107 7.7 Network Model .................................................................................................. 107 7.8 Condition Model ................................................................................................ 107 7.9 SCADA Telemetry .............................................................................................. 107 8. PLAN IMPROVEMENT AND MONITORING ........................................... 108 8.1 Previous Action Plans ......................................................................................... 108 8.2 Performance Monitoring and Management ............................................................ 109 8.3 Improvement Programme .................................................................................. 109 8.4 Monitoring And Review Procedures ...................................................................... 110 9. ACTION PLAN .................................................................................... 111 9.1 Explanation ...................................................................................................... 111 9.2 Annual Performance Monitoring .......................................................................... 112 Water Asset Management Plan 2012-2022 1142397 ii Nelson City Council LIST OF TABLES Table ES1 Sustainability Matrix ........................................................................................... 10 Table ES2 Years 1-3 of the 2012/22 Long Term Plan Financial Summary .................................. 11 Table 2.1 Asset Performance ............................................................................................. 22 Table 2.2 Links Between Levels of Service and Community Outcomes ..................................... 23 Table 2.3 Ministry of Health Grading Schedule ..................................................................... 28 Table 2.4 Demerit Points 2008 – 2011 grading .................................................................... 29 Table 2.5 Urgent Maximum Response Times ........................................................................ 39 Table 2.6 Non Urgent Maximum Response Times ................................................................. 39 Table 3.1 Population Projections ........................................................................................ 45 Table 3.2 Water Demand Projections (Peak Day 1 in 60 year Drought) ................................... 46 Table 3.3 Current Reservoirs ............................................................................................. 50 Table 3.4 Proposed Reservoirs ........................................................................................... 50 Table 4.1 Likelihood Ratings (Semi Qualitative Measure) ....................................................... 57 Table 4.2 Semi-Quantitative