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Watercare Services Limited WATERCARE SERVICES LIMITED PROPOSED WAIKATO RIVER TAKE Resource Consent Applications and Assessment of Environmental Effects 11 December 2020 TABLE OF CONTENTS Executive Summary _____________________________________________________________ 1. Introduction ___________________________________________________________ 1 1.1 Structure of this Report 3 2. Te Ture Whaimana o te Awa o Waikato _____________________________________ 5 3. The Watercare Proposal _________________________________________________ 7 3.1 Overview 7 3.2 The Location of the Waikato Water Treatment Plant and Existing Waikato River Takes 9 3.3 The Watercare Applications 12 4. Planning Framework ___________________________________________________ 21 4.1 Resource Consents Required 21 4.2 Relevant Statutory Documents 25 5. Supply / Demand Assessment ___________________________________________ 26 5.1 Water Supply Demand 26 5.2 Water Availability 29 5.3 The Supply / Demand Balance 35 6. Alternative Source Assessment __________________________________________ 38 6.1 Assessment Overview 38 6.2 Stage 2 Review 44 6.3 Stage 3 Review 45 6.4 Stage 4 Review 46 6.5 Stage 5 Review 47 6.6 Conclusion 62 7. Intake Location and Type _______________________________________________ 64 7.1 Intake Location 64 7.2 Intake Type 69 8. Existing Environment __________________________________________________ 70 8.1 General Setting 70 8.2 Cultural 70 8.3 The Waikato River 71 8.4 Existing Users 74 8.5 Existing Watercare Takes 75 8.6 Hydrology 76 8.7 Waikato River Ecology 78 9. Effects Assessment ___________________________________________________ 83 9.1 Introduction 83 9.2 Positive Effects 84 9.3 Cultural Effects 85 Waikato River Water Take and Discharge Proposal – Board of Inquiry 9.4 Construction Effects 86 9.5 Hydrological Effects 90 9.6 Ecological Effects 92 9.7 Effects on Other Water Takes from the Waikato River 103 9.8 Recreation and Navigation 105 10. Monitoring __________________________________________________________ 107 11. Consultation _________________________________________________________ 108 11.1 Introduction 108 11.2 Iwi and Mana Whenua Consultation 108 11.3 Other Stakeholders 111 12. Statutory Assessment _________________________________________________ 115 12.1 Information Requirements 115 12.2 Resource Consent Requirements and Activity Status 131 12.3 Section 104 Assessment 131 12.4 Section 105 Assessment 167 12.5 Section 107 Assessment 168 12.6 Part 2 of The Resource Management Act 1991 169 12.7 Overall Summary 171 13. Concluding Statement _________________________________________________ 172 LIST OF FIGURES Figure 1: Intake Layout 12 Figure 2: Waikato River Water Allocation. 13 Figure 3: Bulk Water Supply Network. 10 Figure 4: Waikato Water Treatment Plant Location Map. 11 Figure 5: Intake Layout 17 Figure 6: Indicative Enhancement Areas 18 Figure 7: Allocation Showing Watercare Application at 150,000 m3/day. 22 Figure 8: How Outage and Headroom are Included in the Supply-Demand Balance. 30 Figure 9: Distribution of Annual Average Headroom 2020 to 2055. 34 Figure 10: Distribution of Peak Headroom 2020 to 2055. 35 Figure 11: Baseline Annual Drought Supply / Demand Balance. 36 Figure 12: Baseline Peak Period Supply / Demand Balance. 37 Waikato River Water Take and Discharge Proposal – Board of Inquiry Figure 13: Overview of the Options Assessment Process. 38 Figure 14: Flowchart Overview of Options Screening Process. 42 Figure 15: 100 km radii around Schnapper Rock Road Reservoir and Redoubt Road Reservoir. 43 Figure 16: Stage 2 Screening – Outcomes by WSAA Option Type. 45 Figure 17: Conceptual Deep Sea Desalination Scheme Based at Rosedale WWTP. 49 Figure 18: Desalination Process Flow Diagram. 50 Figure 19: Schematic for Indirect Potable Reuse Rosedale AWTP to Campbell Road Reservoir (no surface abstraction). 53 Figure 20: Schematic for Rosedale Direct Potable Reuse. 53 Figure 21: Schematic for Māngere Direct Potable Reuse. 54 Figure 22: Long List Intake Options – Watercare Site. 65 Figure 23: Riverbank Pump Station Intake Option. 67 Figure 24: Waikato A WTP Pump Station Intake Option. 68 Figure 25: Waikato River Water Allocation. 104 LIST OF TABLES Table 1: Summary of Intake Construction Effects. 16 Table 2: Magnitude and Level of Hydrological Effects of the Proposed Water Take. 17 Table 3: Summary of Operational Effects on Waikato River Water Quality and Ecology. 18 Table 4: Summary of Resource Consents Required. 19 Table 5: Peak Day Deployable Outputs and Constraints. 31 Table 6: Annual Drought Deployable Outputs. 32 Table 7: Summary of Outage Results for the Peak and Annual Periods. 32 Table 8: Recommended Headroom Allowances (MLD). 35 Table 9: AWTP Plant Capacity. 54 Waikato River Water Take and Discharge Proposal – Board of Inquiry Table 10: Cost estimate for 75 MLD and 150 MLD Reuse Options. 55 Table 11: Operation Cost Estimate ($/annum) for 75 MLD and 150 MLD Reuse Options. 55 Table 12: Summary of Relevant 7-day Low Flow Statistics for the Waikato River. 77 Table 13: Summary of Intake Construction Effects. 89 Table 14: Magnitude and Level of Hydrological Effects of the Proposed Water Take. 91 Table 15: Summary of Operational Effects on Waikato River Water Quality and Ecology. 100 Table 16: Waikato Regional Plan General Information Requirements for all Applications. 121 Table 17: Waikato Regional Plan Information Requirements for Water Take Applications. 123 Table 18: Waikato Regional Plan Information Requirements for Discharges to Water. 125 Table 19: Waikato Regional Plan Information Requirements for Damming Water. 126 Table 20: Waikato Regional Plan Information Requirements for Applications to Use, Erect, Place, Extend, Alter or Reconstruct a Structure In, On, Under or Over the Bed of a River or Lake. 127 Table 21: Waikato Regional Plan Information Requirements for the Demolition or Removal of a Structure. 129 Table 22: Waikato Regional Plan Policy 11 Assessment Criteria for Surface Water Takes. 150 Table 23: Waikato Regional Plan Rule 3.3.21 Matters of Discretion. 155 LIST OF APPENDICES Appendix A: Water Management Plan Waikato River Water Take and Discharge Proposal – Board of Inquiry © Mitchell Daysh Limited (2020). This document and its contents are the property of Mitchell Daysh Limited. Any unauthorised employment or reproduction, in full or in part, is forbidden. Waikato River Water Take and Discharge Proposal – Board of Inquiry EXECUTIVE SUMMARY INTRODUCTION Watercare Services Limited (“Watercare”) is a lifeline utility providing water and wastewater services to a population of 1.7 million people in Auckland. Watercare is the council-controlled organisation of Auckland Council responsible for municipal water supply services within Auckland, and the provider of bulk water supply services to Pokeno and Tuakau in the Waikato District.1 Watercare supplies approximately 440,000 cubic metres of water per day (“m3/day”) on average across the year, derived from a range of sources and treated to the Ministry of Health Drinking Water Standards for New Zealand 2005 (“DWSNZ”) (revised 2018). Watercare’s three main water supply sources are:2 • Water storage lakes in the Hūnua and Waitākere ranges; • A groundwater aquifer in Onehunga; and • The Waikato River. The exact proportion supplied from each source varies daily, depending on a range of factors including the levels in the storage lakes, forecast rainfall, treatment plant capacity, and maintenance requirements. In December 2013, Watercare applied to the Waikato Regional Council (“WRC”) for resource consents to authorise the taking of an additional 200,000 m3/day (net) of water from the Waikato River, a new water intake structure and discharges from a new water treatment plant. Since that time, Watercare’s water take application (and the associated applications) have been on hold while the WRC processes and decides other applications to take water from the Waikato River Catchment that were lodged before Watercare’s application. During the period from late 2019 through to mid-2020, the Auckland region faced one of the most extreme drought events in modern times with rainfall for the period between January and May 2020 being approximately 30% of what would normally be expected for that period. At Watercare’s recommendation, in May 2020 Auckland Council imposed water use restrictions in Auckland for the first time since the early 1990s. Watercare also took additional steps to improve security of supply during the drought by exercising emergency powers 1 Under a bulk supply agreement with Waikato District Council. 2 Watercare also operates individual water supplies for several other communities, such as Muriwai, Algies Bay, Snells Beach, Bombay, Waiuku, Warkworth, Helensville and Wellsford, based on various water sources including groundwater and surface water. under Section 330 of the Resource Management Act 1991 (“RMA”),3 and by re-establishing supply from previously decommissioned sources.4 While the above steps have been taken to ensure Auckland’s short term water supply requirements are met, the focus has now turned to the future. Watercare’s focus remains planning for water demand over the long term by securing sustainably sourced water to achieve: • Certainty of supply in up to a 1:100-year drought with 15% residual dam storage; and • Certainty of supply to meet peak demand. On 30 June 2020, after considering advice provided by the Environmental Protection Authority, the Minister for the Environment issued a direction under Section 142(2) of the RMA to call in Watercare’s 2013 application and refer it to
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