Mackenzie District Council Stormwater Activity Management Plan 2018 – 2028 Mackenzie DC Activity Management Plan TABLE OF CONTENTS 1.0 OVERVIEW 6 2.0 EXECUTIVE SUMMARY 7 2.1 What are we doing 7 2.2 Why are we doing it? 7 2.3 Where are we headed? 7 2.4 How will we get there? 8 2.5 How well are we doing and how well do we measure progress? 9 2.6 What resources do we have and what resources do we need? 10 2.7 Who pays for it? 10 3.0 INTRODUCTION 11 3.1 Purpose 11 3.1.1 Purpose of this Activity Management Plan 11 3.1.2 Purpose of Asset Management 11 3.2 Goals and Objectives of asset ownership 11 3.2.1 Purpose of Ownership 11 3.2.2 Review of Activities and Funding 11 3.2.3 Legal Authority for Council Action 12 3.3 Links to Council Vision, Mission, Goals and Objectives 12 3.3.1 Vision 12 3.4 Asset Management Drivers 12 3.4.1 Customer Service 13 3.4.2 Financial Responsibility 13 3.4.3 Environmental Responsibility 13 3.4.4 Safety 13 3.4.5 Economic Efficiency 13 3.4.6 Achieve Strategic Goals 14 3.5 Plan Framework 14 3.6 Appropriate Level of Asset Management 15 4.0 DESCRIPTION OF SERVICE 16 4.1 Overview of the Activity 16 4.2 Description of Assets 16 4.3 Key Issues 16 4.4 Stormwater Reticulation 17 4.5 Manholes 19 4.6 Pump Stations 19 4.7 Stormwater Treatment/Retention Areas 19 4.7.1 Discharge/Disposal 19 4.8 Buildings 20 4.9 Critical Assets 20 5.0 ASSET MANAGEMENT PROCESSES & PRACTICES 21 5.1 Introduction 21 5.2 Systems 22 5.2.1 AssetFinda 23 5.2.2 SCADA 24 5.3 Data Management 24 5.4 Data Confidence 24 5.4.1 CCTV Inspections 25 5.5 Information Technology 26 5.6 AMP Preparation 26 5.7 Quality Assurance 27 5.7.1 Audits 27 5.7.2 Knowledge of assets 28 5.7.3 Accounting/Economics 28 5.7.4 Risk Management 28 5.7.5 Operations 28 Page 2 of 111 Stormwater 2018 Mackenzie DC Activity Management Plan 5.7.6 Maintenance 28 5.7.7 Optimised Lifecycle Strategy 28 5.7.8 Design & Project Management 28 5.7.9 Suitably Qualified and Trained Staff 28 5.8 Sustainable Practices 29 5.8.1 Overview 29 5.8.2 Sustainability and Lifecycle 29 5.8.3 Significant Negative Effects 30 5.9 Environmental Management 30 5.9.1 Schedule of Resource Consents 30 5.9.2 Consent Monitoring and Reporting 31 5.9.3 Canterbury Land and Water Regional Plan 31 6.0 LEVELS OF SERVICE 32 6.1 Defining the Levels of Service 32 6.2 Activity Goals and Objectives 32 6.2.1 Organisation Mission, Goals and Objectives 32 6.2.2 Stormwater Activity Goal and Principal Objectives 33 6.3 Current Levels of Service 33 6.3.1 Changes to Levels of Service 33 6.3.2 Levels of Service 34 6.3.3 Secondary Levels of Service 34 6.4 Levels of Service Development 35 6.4.1 Levels of Service Definition 36 6.5 Performance Measures 36 6.6 Affordability and Willingness to Pay 37 6.7 Reporting 37 6.8 Consultation & Communication 38 6.8.1 Consultation 38 6.8.2 Communication 39 6.8.3 Key Stakeholders 39 6.9 Legislative Requirements 39 6.9.1 National Strategies & Plans 40 6.9.2 Key Legislation 44 6.9.3 Standards, Codes of Practice & Guidelines 46 6.9.4 Regional Strategies & Plans 46 6.9.5 Council Strategies, Plans, Bylaws and Policies 46 6.9.6 Bylaws 49 6.9.7 Policies 50 6.9.8 Procedures 50 7.0 FUTURE DEMAND 51 7.1 Overview 51 7.2 Demand Drivers 51 7.3 DEMAND FORECASTS 51 7.3.1 Growth Trends – 51 7.3.2 Economic Changes - 52 7.3.3 Climate Change 52 7.3.4 Improvements to Levels of Service 53 7.4 Demand Impacts on Assets 54 7.5 Demand Management Plan 54 7.5.1 Asset Based Demand Management 54 7.5.2 A New Way of Handling Stormwater 56 7.6 Future Capital Programme 56 8.0 RISK MANAGEMENT 58 8.1 Overview 58 8.2 Risk Events 58 8.3 Current Approach 58 8.3.1 Risks Assessed and Mitigated 59 8.3.2 Integration of risk management approach 59 2018 Stormwater Page 3 of 111 Mackenzie DC Activity Management Plan 8.3.3 Health and Safety 59 8.3.4 Business Continuity Plan 60 8.3.5 Civil Defence & Lifelines 60 8.3.6 Emergency Management 60 8.3.7 Earthquake Damage Assessment 60 8.3.8 Alpine Fault 8 61 8.4 Resilience 61 8.5 Insurance 62 8.6 Assumptions and Uncertainties 62 9.0 LIFECYCLE MANAGEMENT 72 9.1 Overview 72 9.2 Management 72 9.3 Operations and Maintenance 73 9.3.1 Service Delivery 74 9.3.2 Management & Maintenance History 75 9.3.3 Maintenance and Operational Strategies 75 9.3.4 Current Condition 77 9.3.5 Current Performance 77 9.3.6 Operation and Maintenance Costs 77 9.3.7 Manuals and procedures 77 9.4 Renewal/Replacement 77 9.4.1 Renewal Strategy 78 9.4.2 Projected Renewals 78 9.4.3 Deferred Renewals 79 9.4.4 Planned Renewals 79 9.5 Asset Development 81 9.6 Asset Disposal 81 10.0 FINANCIAL 82 10.1 Funding Details 82 10.1.1 Financial Strategy 82 10.1.2 Rating & Borrowing 82 10.1.3 Price Level Changes & Forecast Financial Statements 82 10.1.4 Vested Assets 83 10.1.5 Funding Strategy 83 10.2 Asset Valuation 84 10.2.1 Depreciation 84 10.2.2 Valuation methodology 85 10.2.3 Asset Lives and Assumptions 85 10.2.4 Resource Consents 85 10.3 Financial Summary 86 11.0 IMPROVEMENT PLANNING 88 11.1 Improvement Plan Achievements 88 11.2 Improvement Plan Focus 89 11.3 Current Improvement Plan 89 11.4 Project Identification and Assignment 91 11.5 Reporting on Projects 91 11.6 AM Preparation, Monitoring & Review 91 APPENDIX A INDIVIDUAL systems DESCRIPTION 92 A1 Fairlie Stormwater System 92 A2 Lake Tekapo Stormwater System 99 A3 Twizel Stormwater System 106 Page 4 of 111 Stormwater 2018 Mackenzie DC Activity Management Plan TABLE OF TABLES Table 5-1: Data Confidence................................................................................................................... 24 Table 6-1: Community Outcomes & Levels of Service linkage ............................................................ 34 Table 7-1: Stormwater Capital Projects ................................................................................................ 57 Table 8-1: Significant Forecasting Assumptions .................................................................................. 63 Table 9-1: Lifecycle Management Categories ....................................................................................... 72 Table 9-2: Management Activities ........................................................................................................ 73 Table 9-3: Current Contract .................................................................................................................. 74 Table 9-4: Historical data...................................................................................................................... 75 Table 9-5: Asset Strategies ................................................................................................................... 75 Table 9-6: Non-Asset Strategies ........................................................................................................... 76 Table 9-7: Planned Renewals .............................................................................................................. 80 Table 10-1: Asset Valuation .................................................................................................................. 84 Table 10-2: Future Financial Requirements ......................................................................................... 86 Table 11-1: 2015 Improvement Plan Achievements ............................................................................ 88 Table 11-2: Current Improvement Plan ................................................................................................. 90 TABLE OF FIGURES Figure 3-1: AMP Framework ................................................................................................................ 14 Figure 4-1: District wide stormwater main material distribution ............................................................ 18 Figure 4-2: District wide water main size distribution ........................................................................... 18 Figure 4-3: District wide Public Wastewater System Population distribution ....................................... 19 Figure 5-1: Council’s Organisational Structure..................................................................................... 21 Figure 5-2: Essential Services Group Structure ................................................................................... 21 Figure 5-3: Council Systems ................................................................................................................ 23 Figure 5-4: The CCTV Process ............................................................................................................ 26 Figure 6-1: Stormwater Service - Satisfaction Rates ............................................................................ 38 Figure 6-2: Corporate links to AMPs .................................................................................................... 49 Figure 9-1: Balancing Proactive and Reactive Maintenance ............................................................... 74 Figure 9-2: Historical O&M Costs ......................................................................................................... 77 Figure 9-3: District Wide Projected Renewals ...................................................................................... 79 Figure 10-1: Proposed Future Capital Works ....................................................................................... 86 2018 Stormwater Page 5 of 111 Mackenzie DC Activity Management Plan 1.0 OVERVIEW The stormwater activity is a core Council activity that contributes towards the provision of good quality infrastructure and