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2018-2048 Infrastructure Strategy - Environment Southland
2018-2048 Infrastructure Strategy - Environment Southland →
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1 Infrastructure Strategy 2018-2048 Protecting our Communities VOLUME 2 Environment Southland 2018–2028 Long-term Plan June 2018 Publication No 2018-07 ISBN No 978-9-909043-29-2
2 This document has been prepared in accordance with s101B of the Local Government Act 2002 following guidance from publications “Dollars and Sense” – New Zealand Society of Local Government Managers and “Matters arising from the 2015-25 local authority long-term plans” – Controller and Auditor General. Approval Date and Date of Next Scheduled Review Approved By MORF Reference Related Standards Approved – 20 February 2018 Adopted – 28 March 2018 Reviewed – Director of Operations Council A339983 -
3 Contents 1. Introduction . . 4 2. Purpose/Vision . . 5 3. Southland Context . . 6 4. Significant infrastructure issues, management options and implications . . 7 4.1 Climate and Geographic issues . . 7 4.1.1 Climate . . 7 4.1.2 Catchments . . 8 4.1.3 Hazardscape . . 11 4.1.4 Climate change and its impacts . . 11 4.1.5 Options to manage climate and geographic issues . . 13 4.1.6 Adapting to Climate Change . . 14 4.2 Demographic issues . . 16 4.2.1 Current demographics . . 16 4.2.2 Predicted demographic trends . . 17 4.2.3 Options to manage demographic issues . . 19 4.3 Economic issues . . 19 4.3.1 Current economic situation . . 19 4.3.2 Projected economic trends . . 20 4.3.3 Options to manage economic issues . . 20 4.4 Stopbank upgrade issues . . 20 4.4.1 Invercargill City stopbank upgrades . . 20 4.4.2 Options to manage Invercargill City stopbank upgrades . . 22 4.5 Lake Hawkins Pumping Station replacement . . 23 5. Assumptions and capital expenditure drivers . . 24 5.1 Performance over the next 10 years . . 24 5.2 When should infrastructure be maintained, repaired, renewed . . 24 5.3 Other Assumptions . . 25 6. Most likely scenario . . 26 7. Financial forecasts of annual operating and capital expenditure . . 28 8. Appendices . . 31 Appendix 8.1 - Inventory of Environment Southland owned and managed assets . . 32 Appendix 8.2 – Catchments showing floodable areas and infrastructure locations . . 39 Appendix 8.3 – Potential Liquefaction Risk Areas . . 43 Appendix 8.4 – Insurance and Reserve Policies . . 44
4 1. Introduction Southland has enviable economic growth, strong social cohesion and excellent community services and facilities. Southland is a geographically diverse region, encompassing 12.5% of New Zealand’s landmass. With just over 2% of the population it has historically produced in excess of 15% of New Zealand’s tradable exports. The economic growth that has been achieved, especially in recent years, has bolstered the community and contributed to higher than average household incomes and employment. There remains in Southland considerable uncertainty about the future, including the sustainability of the few key industries supporting the regional economy and a population that is both ageing and projected to decrease.
Mega trends such as urbanisation, demographic shifts and the impacts of climate change that have a global impact are particularly challenging for Southland and will have to be continually dealt with at national, regional and local levels beyond the 30year scope of this Strategy. The Southland Regional Development Strategy has highlighted that the projected depopulation of the area is the most concerning issue facing Southlanders. Depopulation also impacts Southland’s ability to construct, maintain and improve vital regional infrastructure in the face of increasing pressure from forces such as climate change. This strategy will explore how the region plans to manage its infrastructure responsibilities in a way that adapts to future challenges. Affordability and an ability to pay are questions that will have to be addressed by local government now and into the future as the rating based funding source for capital projects will likely prove unsustainable for Southland’s ratepayers against a backdrop of an ageing population. The connection between this Infrastructure Strategy and the Council’s Financial Strategy will become more critical if funding source options reduce or become less able to provide the level of funding required to maintain protection and reduce the flood risks to people, property and livelihoods. The inflation indices used previously were based on the Consumer Price Index but that has become irrelevant to the local government sector which provides specialised services. The latest inflation indices are produced by BERL specifically for New Zealand’s local government sector, through the Local Government Cost Index (LGCI).
Rob Phillips Chief Executive
5 2. Purpose/Vision This Strategy has been prepared to give an account of, and forecast spending for, infrastructure in the Southland region within the direct control of Environment Southland. The vision for Environment Southland is simple - “a thriving Southland”. This strategy contributes directly to achieving this organisational vision by supporting sustainable communities. This strategy also sets a complementary and specific vision for the long-term management of regional infrastructure that is integrated with the broader organisational principles of risk management, efficiency and innovation. One of Environment Southland’s community outcomes is a commitment that our actions will lead to “more empowered and resilient communities” and this strategy is a key element in providing for community resilience through effective management of a regional flood protection system.
Southland features a diverse range of interconnected ecosystems, from the alpine regions and forests of Fiordland to the eastern Southland plains. The unique geography and climate that makes Southland so appealing for a range of residents and visitors also makes it susceptible to significant flooding events. Over time, urban areas have been built alongside the rivers, agriculture has developed on flood plains, wetlands have been drained and native vegetation on the hills has been reduced, collectively adding to the flood risk.
The primary infrastructure maintained by Environment Southland is the network of flood protection infrastructure comprising stopbanks, dams, bridges, culverts and tidegate structures that have been designed to reduce the impact of significant flooding events along the tributaries of the Aparima, Oreti, Makarewa, Waihopai, Mataura Rivers and Otepuni Stream, as well as other smaller waterways. The flood protection infrastructure maintained by Environment Southland works in combination with other similar assets (stormwater etc) managed by the three local territorial councils in Southland. Changes to one part of the flood protection network may alter the efficacy of other components and this strategy anticipates a collaborative approach to managing the wider network.
The flood protection and control schemes maintained by Environment Southland protect property, lives and livelihoods. These protection schemes enhance the experience of living and working in Southland by providing a level of security in the face of potentially devastating flooding effects. In urban areas they protect homes, businesses and infrastructure while the rural schemes protect the land and property outside the stopbanks. Environment Southland’s flood protection infrastructure has also been retrofitted to allow for public access that enhances the network of walkways/cycleways within the Southland region.
This strategy forms a comprehensive overview of the current state of and future outlook for infrastructure assets managed by Environment Southland and is a pathway for guaranteeing the accepted levels of service included in the Long-term Plan. This strategy aligns with the community outcomes articulated on the theme of community resilience throughout the Long-term Plan to ensure the standard of protection received from flood protection schemes.
6 3. Southland Context Southland is the second largest region in New Zealand. It covers an area of 34,000 km2 (12.5% of New Zealand’s land mass). The coastal boundary extends some 3,100 kilometres from Awarua Point (Fiordland) on the west coast, to Waiparau Head (Catlins) on the fringe of the east coast, and includes Stewart Island/Rakiura. In all, 53% of Southland’s land area is managed as public conservation land, predominantly as National Parks. Farms occupy 86.7% of the region’s developed lands, covering approximately 10,400 km2 . Approximately 10% of developed lands are forestry (commercial, indigenous and farm) representing 1,180 km2 and the remaining 3.3% (393 km2 ) comprises of urban centres, transport networks and industry. This section outlines Southland’s geography and climate, current hazardscape, and future assumptions relating to changes in natural and built systems that may, or are likely to, impact the way in which flood protection infrastructure is managed and will provide context for the infrastructural issues and decisions outlined in subsequent sections. Southland Lifelines Project The Southland Lifelines Group is a collective non-executive organisation where lifeline utilities within the Southland region contribute to joint initiatives in an effort to reduce the vulnerability to natural hazards, establish their interdependencies and identify their critical infrastructure locations. Lifeline utilities are entities that provide infrastructure services to the community such as transport, water, wastewater, energy and communications. Schedule One of the Civil Defence Emergency Management Act 2002 defines lifeline utilities.
The Southland Lifelines Group has retained continuity throughout the country by adopting the objective of the New Zealand Lifelines Committee of: “Enhancing the connectivity of lifeline utility organisations across agency and sector boundaries in order to improve infrastructure resilience.” In 2012, The Southland Lifelines Group undertook a vulnerability study and produced a critical infrastructure report for Southland. Hazards information from that report has been referenced where consideration was given to flood control infrastructure and community resilience.
7 4. Significant infrastructure issues, management options and implications 4.1 Climate and Geographic issues The physical nature of the Southland region, its terrain (natural and modified), climate and hazardscape are key contributing factors to the major flooding events that threaten the region. Understanding these features provides the basis for determining current and future capacity of the infrastructure to meet expected levels of service. It can also guide a pragmatic strategy for investment in flood protection infrastructure to occur as needed.
4.1.1 Climate Southland’s weather is generally determined by prevailing conditions that cover large portions of the southern hemisphere. Three weather patterns are predominant at the regional level: 1. persistent westerly flow periodically interrupted by fast moving, weak fronts; 2. northerly flow caused by major troughs, with southerly airstreams behind; and 3. easterly airstreams caused by a reversal in pressure distribution. The persistent wet westerlies drop most of their moisture (5,000–10,000 mm/yr) on the western side of the partial barrier formed by the Fiordland mountain ranges, making Fiordland one of New Zealand’s coolest and wettest areas. Rainfall on the eastern side of the ranges is much lower, although still reasonably common, with Southland’s lowlands and hills receiving an average annual rainfall of between 800 and 1,200 millimetres.
The absence of nearby large land masses ensures that the air that reaches New Zealand is humid with a moderate temperature (average annual temperatures range from 10 degrees Celsius in the south to 16 degrees in the north of the country). Air temperatures have a small annual range in Southland, with July being the coldest month and January the warmest. Temperature variation tends to be less in coastal areas due to the moderating effect of the sea.
8 Southland median rainfall and temperature – NIWA 2012. 4.1.2 Catchments Four major river catchments extend over Southland - Waiau, Aparima, Oreti and Mataura (see map on the following page). Combined, these catchments cover 54% (18,305 square kilometres) of the region while the balance of the area falls within the Fiordland and Rakiura National Parks. Catchment Area Headwaters Major tributaries Mataura 5,360 km 2 Eyre Mountain range, west of Kingston Eyre, Nokomai, Waikaia, Waikaka, Mimihau and Wyndham Rivers.
Oreti 3,510 km 2 East of Mavora Lakes Windley River, Acton, Cromel, Irthing, Dipton and Winton Streams. Downstream in the tidal reach, the Makarewa and Waikiwi Rivers flow into the Oreti River. Aparima 1,375 km 2 Takitimu Mountains west of Mossburn Waterloo and Hamilton Burns, Pleasant Creek, Opio and Otautau Streams. Waiau 8,173 km 2 Wick and Livingstone Mountains Above the Weir: Mavora Lakes and Mararoa River, Eglinton, Upukerora and Whitestone Rivers and Lakes Te Anau and Manapouri. Below the Weir: Borland Burn, Lake Monowai and Monowai River, Dean, Lill and Alton Burns, and the Wairaki, and Orauea Rivers.
Reducing the flood risk along the major tributaries within these catchments is the primary function of Environment Southland’s flood protection infrastructure. The flood protection scheme, including 458 km of stopbanks, protects major population centres, smaller townships and large swathes of rural production land. The Oreti River, which flows into the New River Estuary and poses a flood risk to the region’s major population centre, Invercargill, as well as the smaller townships of Winton, Wallacetown, Dipton and Lumsden. As such, it contains the majority of the region’s flood
9 protection stopbanks - 181 km of stopbanks line the Oreti River and 18 km line the Makarewa. Thirty-six kilometres of stopbanks and three detention dams are also present throughout the smaller rivers and streams, including the Waihopai River, that flow directly through Invercargill’s built up area. Other stopbanks operated by Invercargill City Council complement the Environment Southland infrastructure. The flood protection infrastructure in the Mataura catchment composes of 113 km of stopbanks along the Mataura River protecting the regional centre of Gore as well as the smaller towns of Mataura and Wyndham. The flood protection scheme also includes stopbanks along the Waikaia River, primarily to protect the Waikaia township and its surrounds.
88 km of stopbanks line the Aparima River protecting Riverton on the coast and Otautau inland. The 22 km of Waiau catchment stopbanks manage flood flow stemming from the Whitestone River, and the upper reaches of the Upukerora River, which flows into Lake Te Anau. Other works owned by Southland District Council protect the Tuatapere township located on the lower reaches of the Waiau River. An inventory of the flood protection assets owned and managed by Environment Southland is included in Appendix 8.1. Maps showing the location of the stopbanks, including those owned and managed by Invercargill City Council, are in Appendix 8.2.
10 Southland’s Main River Catchments
11 4.1.3 Hazardscape All declared civil defence emergencies in Southland have been related to rainfall, predominantly flooding and storm damage. Each of the floods in the region have been followed by river control works in one form or another, usually channelisation and stopbanking, followed by upgrades in response to successive floods. While flood risk is increasingly managed, the four major rivers of Southland, the Waiau, Mataura, Oreti and the Aparima, along with their tributaries, still present a significant hazard to several townships and the rural areas they service. Tuatapere on the Waiau, Otautau and Thornbury on the Aparima; Lumsden, Centre Bush and Winton on the Oreti; Gore, Riversdale, Mataura and Wyndham on the Mataura all have flood history and remain vulnerable to flooding to some degree.
Parts of Invercargill remain at risk of flooding from various or combined riverine sources, despite a major upgrade of flood protection works and the adoption of non-structural flood alleviation measures following the big floods of 1984. There are major components to the Invercargill flood protection scheme that include protection works and detention dams on the Kingswell, Otepuni, and Waihopai Streams. While on the basis of history, floods may appear to be the most significant hazard for the region, it is likely that earthquakes, particularly an earthquake on the Alpine Fault presents the most risk. There is a 50 percent chance of a magnitude 8.1 plus earthquake occurring on the Alpine Fault in the next 50 years. This will be a significant South Island wide event that will be particularly noticeable in Fiordland and northern Southland. It is not unrealistic to expect that it will occur in the lifetime of at least 50% of the Southland population. 4.1.4 Climate change and its impacts The National Institute of Water and Atmospheric Research (NIWA) has looked at likely climate scenarios based on a number of greenhouse gas emission scenarios from the Intergovernmental Panel on Climate Change (IPCC). Using the mid-range of these scenarios, NIWA predicts a temperature increase of about 1 degree Celsius temperature increase by 2040 and a 2 degree Celsius by 2090.
A warmer atmosphere can hold about 8% more moisture for every 1 degree Celsius increase in temperature. Rainfall is projected to rise and heavy rainfall events are likely to become heavier and more frequent. Strong winds are also predicted to increase. Should these predictions play out, Southland would be exposed to an increased likelihood of natural hazards such as flooding and drought. The projected impacts of climate change mean an increased variability in emergencies over a shorter time – droughts to storms. This may increase the overall risk to the community and may test the ability of people to be well-prepared, and increase risks to economic productivity.
 a large number of Southland’s population live on flood plains and despite the extensive flood mitigation work, flooding remains a significant risk;  rising sea levels provide a challenge for coastal communities. As this issue will affect several communities across local authority boundaries, the Southland Mayoral Forum will take responsibility to investigate the issues and response, and discuss with the community;
12  there are significant areas of existing development, including large portions of the stopbank network, located on potentially liquefiable soils and liquefaction has the potential to affect these developments;  a high possibility that seismic activity generated by the Alpine Fault would have a significant impact in Southland. Climate trait (Increase/Decrease) Predicted change Infrastructure implications Infrastructure risk assessment Temperature Temperatures between 0.6˚C to 0.9˚C warmer by 2040 as compared to 1995. Temperatures between 0.6˚C to 2.8˚C warmer by 2090 as compared to 1995. Up to 16 extra days per year where maximum temperatures exceed 25˚C. Fewer frosts per year.
Temperature rises alone are unlikely to increase stress on infrastructure assets or their capacity to protect communities. For every 1°C gained the atmosphere is capable of holding about 8% more water adding to the rainfall risk. Risk Level: Moderate Change likelihood: Highly likely Consequences: Insignificant Rainfall Increase in frequency and duration of rainfall, particularly in winter and spring. Increase in frequency of extreme rainy days. Increases in rainfall will increase the probability of flood events occurring. The standard of protection for existing flood protection infrastructure will lower as flood events occur with higher frequency/intensity.
Risk Level: Very high Change likelihood: Likely Consequences: Significant Snowfall Significant decreases in seasonal snow. Decrease in snow days by up to 30 days. Decrease in the duration of snow cover. Rise in snowline and snowfall replaced with rainfall. Less winter snowfall and an earlier spring melt may cause marked changes in the annual cycle of river flow in the region. For rivers where the winter precipitation currently falls mainly as snow and is stored until the snowmelt season, there is the possibility for larger winter floods placing increased pressure on flood protection infrastructure. Risk Level: High Change likelihood: Highly likely Consequences: Moderate Wind The frequency of extremely windy days in Southland by 2090 is likely to increase by between 2 and 7 per cent. Increase in the frequency of westerly winds over the South Island, particularly in winter and spring. Increases in windy days alone are unlikely to increase stress on infrastructure assets or their capacity to protect communities.
Risk Level: Low Change likelihood: Likely Consequences: Insignificant Storms Future changes in the frequency of storms are likely to be small compared to natural inter-annual variability. Some increase in storm intensity, local wind extremes and thunderstorms is likely to occur. Increased storm frequency/intensity could place additional stress on flood protection infrastructure, particularly through flash flooding events. Risk Level: Moderate Change likelihood: Likely Consequences: Minor Sea level rise New Zealand tide records show an average rise in relative mean sea level of 1.7 mm per year over the 20th century. The Ministry for the Environment suggest a 1m rise in NZ sea levels by 2100.
Increase in the rate of rise. Sea level rise may also increase the severity of a king tide, storm surge, or tsunami event. Persistent sea level rise at increasing yearly rates will particularly impact low-lying and coastal communities increasing the frequency of damaging floods and property damage in already at risk areas. The standard of protection for existing flood protection infrastructure will lower, particularly in coastal and low lying areas. Risk Level: Very high Change likelihood: Highly likely Consequences: Significant
13 Climate trait (Increase/Decrease) Predicted change Infrastructure implications Infrastructure risk assessment Drought Increases in extreme weather events will include an increase in dry spells and drought. During the 2017/18 summer sustained low rainfall had wide-reaching impacts on the region, disrupting agriculture and restricting water use. Drought was declared on 30 January 2018. Drought can disrupt gravity systems by slowing flow and leading to blocked pipes. Particularly lengthy droughts can also affect wastewater treatment processes, creating functional and safety concerns.
Risk Level: Low Change likelihood: Likely Consequences: Insignificant What does this mean for Southland’s flood protection assets? The major impacts can be broadly summarised:  decrease in the effectiveness of existing infrastructure due to higher flood return periods;  increased pressure on existing infrastructure as the frequency/intensity of flooding events increases;  increases to insurance premiums that protect against possible asset damage or loss. The need to increase the standard of flood protection of existing infrastructure and the need to add new flood protection infrastructure must be considered as part of Environment Southland’s long-term outlook. There will be an expectation that Environment Southland continues to meet community expectations by providing agreed levels of service. The capacity of Environment Southland to respond to the changing hazardscape relies on its ability to pay for changes to the network. How the ability to pay might be realised will depend, in part, on the demographic composition of the region.
As sea levels rise, as a consequence of climate change, the frequency and severity of storm and flood events is likely to increase. This will increase the exposure to Environment Southland owned river management assets. In the long-term, the increase in risk, combined with the increase in losses, both locally and globally, could increase the cost of risk transfer. If the assets are strengthened or adapted to the new environment then this will mitigate these potential cost increases. It will be up to Council’s insurance intermediary to optimise risk transfer arrangements and this necessitates a good understanding of the assets, risk management processes and risk appetite/tolerance within Environment Southland. The cost benefit between self-retention, risk transfer and physical mitigation will need to be reviewed on a regular basis to ensure that the optimal programme is in place. 4.1.5 Options to manage climate and geographic issues Management options Implications of action Likelihood of undertaking action Ongoing modelling of impacts in relation to infrastructure capacity to cope with those impacts.
Accurate and up-to-date modelling (including flood modelling and return periods) allows for accurate information on the standard of protection being provided and will inform the need to upgrade or provide new infrastructure. Certain – ongoing (preferred option) Continued monitoring and maintenance of facilities. Asset monitoring is covered by the asset management strategy for each catchment. Accurate asset profiles allow for the prioritisation of maintenance and repairs on the network. Certain – ongoing (preferred option) Local, regional and national emergency readiness and response initiatives. The Ministry of Civil Defence and Emergency Management and Emergency Management Southland co-ordinate initiatives. Their systems are designed to build resilience, minimise impacts and recover quickly in the event of an emergency event. Certain – ongoing (preferred option)
14 Management options Implications of action Likelihood of undertaking action Performance and risk assessment review of urban stopbank systems. Results of performance and risk assessment reviews for the stopbank networks protecting Wyndham, Otautau and Winton will inform the need to undertake additional work beyond the life of this strategy. Certain Upgrading or providing new infrastructure as required. Infrastructure upgrades and new investments are likely to incur significant cost. The cost would likely be borne by those benefiting from the provision or upgrade of the infrastructure. Failure to upgrade or invest in infrastructure when necessary could have serious impacts on lives and livelihoods. Likely – as needed (preferred option – refer to most likely scenario) Increase the height of existing vulnerable stopbanks with earthworks, concrete blocks, timber walls or other barriers Likely – Waihopai and Kingswell stopbanks Fairway improvements including removal of vegetation, smoothing of fairways, use of concrete liners to increase capacity efficiency. Certain – ongoing (preferred option) For urban areas – retrofit of existing stopbanks with sheet piling to increase the resilience of the network and direct water flow. Including potential liquefaction protection.
Unlikely – cost prohibitive Excavate or dredge the channel bed. Unlikely – mainly due to cost and environment issues. 4.1.6 Adapting to Climate Change In December 2017, the Ministry for the Environment released its long awaited phase 1 adaption to climate change stocktake report1 . The Executive Summary indicates: “Global climate has already changed as a result of greenhouse gas emissions from human activities and it will continue to do so. While we are uncertain about the exact speed and scale of change, we know that planning for the future means planning for a different climate. In New Zealand we will experience increased frequency and intensity of extreme events such as higher temperatures flooding, droughts and wildfires, increased sea-level rise, and warmer and more acidic oceans. This will threaten our coastal communities, cities, infrastructure, human health, biodiversity, oceans and resource-based economy (Intergovernmental Panel on Climate Change (IPCC), 2014). These changes may also bring opportunities and we need to plan how we can best position ourselves to take advantage of these.
In November 2016 the Minister for Climate Change Issues established the Climate Change Adaptation Technical Working Group and asked us to advise the Government on New Zealand’s choices for how to build resilience to the effects of climate change. This stocktake report summarises the expected impacts of climate change on New Zealand over the medium and long term, takes stock of existing work on adaptation, and identifies gaps in knowledge and work programmes. This report is a stepping-stone and has informed our second report on New Zealand’s options for building resilience to the effects of climate change. (pg. 6) Climate-related changes New Zealand can expect Natural variations have always played a part in New Zealand’s climate, and will continue to do so. Climate change is expected to shift the 1 “Adapting to Climate Change in New Zealand”, MFE, December 2017
15 range and the pattern of this variability. This will be driven by the greenhouse effect changing the temperature range, the greater water-holding capacity of the atmosphere resulting in more intense rainfall, and by an accelerating rate of sea-level rise from the polar ice sheets. Sea-level rise is one of the major and most certain consequences of climate change. Over the last 100 years, the sea level around New Zealand has risen at an average rate of 1.8 mm per year. Since satellite measurements began in 1993, the average global sea level has risen by about 3.3 mm per year. The IPCC Fifth Assessment Report projects that global sea level will rise by 0.2–0.4 m by 2060 and 0.3–1.0m by 2100, depending on the emissions scenario. However, the collapse of parts of the Antarctic ice sheets could substantially increase this range. The acceleration of sea-level rise will have implications on the ability of natural and human systems to adapt. The following table outlines the changes we can expect to see to our climate and oceans over the medium and long term.” (pg. 7) The report then discusses the potential impacts on the various sectors of New Zealand society, and then discusses how New Zealand may be able to adapt to the variability of climate change impacts.
For the purposes of this Infrastructure Strategy, the local government (pg. 53) and infrastructure (pg. 63) sectors, in particular, are the most relevant. The challenges are significant. The report observes: “Many councils realise the importance of acting on adaptation and would like to do more but identified barriers including limited community buy-in; resourcing constraints (funding, capacity and capability); and lack of leadership and support from central government. There are a few councils that are starting to innovate with community processes and tools for managing climate risks.” (pg.53) An overview of both the local government and infrastructure sectors’ current position on adaptation to climate change are summarised in the following table (pg.96): Local Government Infrastructure Characteristic Attribute Sector Ratings Informed Understanding what is happening Maintain More work required Understand what it means for them More work required Significant work required Organised Know what is expected of them More work required Significant work required Have common goals Significant work required Significant work required Have a planned approach Significant work required Significant work required Have the tools they need Significant work required Significant work required Dynamic Action Are taking action Significant work required Significant work required Are being flexible Significant work required Significant work required Are adapting Significant work required Significant work required The sector rating assessments used in the above table are defined as: Rating Assessment Maintain There is evidence that all descriptors of the attribute are in place More work required There is evidence that most descriptors are in place Significant more required There is evidence that some descriptors are in place Not present There is no evidence that any descriptor of the attribute is in place The phase 2 report is expected to be released in May 2018.
16 4.2 Demographic issues An understanding of Southland’s current population breakdown and expected demographic trends can guide strategic thinking on how and when it may be appropriate to spend on the flood protection network. Analysis of these trends will enable Environment Southland to prepare a long-term infrastructure Strategy that anticipates changes to accepted levels of service and balances the ability to pay for existing and new assets against the need to provide them. 4.2.1 Current demographics Southland accounts for a relatively low proportion of the national population, at just over 2% of the total. The low percentage of the national population weighed against the relative size of the region indicates a relatively sparse population density of approximately 2.9 persons per square kilometre compared to a national distribution of approximately 18 persons per square km.
New Zealand and Southland population density – Wikimedia Commons using Stats NZ data. The majority, approximately 52%, of Southland’s population resides in the Invercargill City Council boundary. This represents the highest concentration of individuals, households and businesses in the region and as such holds a higher density of flood mitigation infrastructure. Gore District Council has approximately 12% of the regional population, with the rest of the population, around 35%, dispersed throughout the small towns and rural areas of Southland District Council.
The median age in the region is currently around 40 years old, two years older than the national median. This is indicative of an ageing population caused in part by a flow of younger people away from the region for a variety of reasons including seeking employment and education. The regional fertility rate has historically been consistent with the national average of around 2 births per woman.
17 The current demographic trends that are likely to impact on infrastructure needs and service delivery, most notably depopulation and ageing, are projected to continue. 4.2.2 Predicted demographic trends Using the medium series of Statistics NZ’s sub-national projected population figures as the most likely regional outcome, Southland’s population is expected to remain relatively stagnant at around 100,000 residents for the next 20 years. Longer term it is anticipated that there will be a slight but persistent decline in the regional population. This outlook does not necessarily anticipate the considerable work being done within the region to attract and retain population in order to combat this trend, but it does represent the most likely statistical scenario without intervention.
18 Census data corroborates the notion that many rural areas, including Southland, anticipate population declines. The general trend though is not a dramatic decline, but ageing populations and depopulation of smaller rural townships. The primary risk this poses to Southland, as with other predominantly rural regional councils, is not the capacity to add new infrastructure in response to rapid urban population growth, but the ability to maintain and improve existing facilities to the agreed standard. With population decline it is often the aging population that remains. This can also place additional pressure on resources and constrain the ratepayer base with flow-on impacts on the regional ability to pay for infrastructure upgrades, improvements and maintenance programmes.
The depopulation of Southland coupled with local concern about the region’s social and economic viability and vulnerability resulted in the Mayoral Forum commissioning a Steering Group to prepare the Southland Regional Development Strategy 2015. This strategy describes a long-term unified approach building on local energy and leadership to deliver growth and change. On the assumption that a general global trend of urbanisation will also impact Southland, the population is expected increasingly to be disproportionately located in Invercargill. This trend
19 would place additional stress on existing flood protection infrastructure, which would be expected to protect an increased number of residents and businesses within the Invercargill footprint. Declining population, which has occurred historically in Southland, can lead to economic downturn and negatively impact on the community lifestyle and infrastructure. 4.2.3 Options to manage demographic issues Management options Implications of action Likelihood of undertaking action Southland Regional Development Strategy The population growth aims contained in the Southland Regional Development Strategy, Action Plan and the proposed Southland Regional Development Agency could combat the projected population decline and revitalise the demographic base.
Certain – ongoing Predictive modelling of ratepayers and ability to pay. Environment Southland considers the Statistics NZ projections to be accurate for the purposes of this strategy and does not consider further modelling necessary. Unlikely Reduce the level of service or standard of protection. Environment Southland does not consider it desirable to reduce service or the standard of protection. Reductions in service are likely to impact on lives, livelihoods and property values. The relative stability of regional demographic trends in both population numbers and built area distribution indicates neither a reduction nor increase will be necessary. Unlikely 4.3 Economic issues Southland’s economy is dominated by agriculture and associated support industries. The makeup of the economy is part of to the region’s profile of resilience to external forces. A strong economy can drive investment in improved flood protection infrastructure.
4.3.1 Current economic situation Southland’s economy is heavily reliant on agriculture. The agriculture sector in Southland is the third biggest in New Zealand (as measured by regional GDP), after Canterbury and Waikato. For the year ended March 2012, agriculture directly contributed $1.1 billion to Southland’s GDP. In Southland, agriculture’s share of regional GDP was 21.9%, which was double that of most other regions, including Canterbury (7.5%) and Waikato (10.9%). Agriculture and forestry occurs mainly in the Southland District and, to a lesser extent, in the Gore District. However, Southland’s largest urban areas, Invercargill City and Gore, are also dependent on the fortunes of these two primary sectors.
The value of goods and services produced in Southland, or total regional Gross Domestic Product (GDP), was just over $5 billion. Although regional GDP has fluctuated since this time, this figure generally indicates the size of the economy. Southland’s economy has two main features that single it out from most other regional economies around New Zealand. First, it is a considerable distance from New Zealand’s three main urban centres - Auckland, Wellington and Christchurch. Second, it is almost completely reliant on the use of natural resources. These two features both constrain the diversity and resilience of Southland’s economy and provide opportunities.
20 4.3.2 Projected economic trends The nature of the economy is not expected to change, at least over the short to medium-term (Market Economics, 2013). Southland’s high proportion of GDP/capita from agriculture means that its economy is far more reliant on the agricultural sector than the New Zealand economy is as a whole, and it is becoming more so over time. The Southland economy’s reliance on agriculture means it is relatively exposed to external forces, in particular changes in the currency exchange rate and commodity prices. In addition to exposure to external forces, the agricultural sector is reliant on natural resource use on both the input and output sides of the production systems.
Linked to the expected demographic trends, Southland’s 65+ age group is growing faster than the national trend and the median age is older than the national average, which will eventually have economic consequences. Shrinking markets and a diminished workforce could squeeze profitability. 4.3.3 Options to manage economic issues Management options Implications of action Likelihood of undertaking action Southland Regional Development Strategy The population growth aims contained in the Southland Regional Development Strategy, Action Plan and the proposed Southland Regional Development Agency could combat the projected population decline and revitalise the demographic base.
Certain – ongoing Promote best practice and resilient business through policy and planning/consents Planning decisions that incorporate knowledge of flood risk and hazards will lead to more resilient communities and better development decisions. Certain – ongoing Reduce the level of service or standard of protection. Environment Southland does not consider it desirable to reduce service or the standard of protection. Reductions in service are likely to impact on lives, livelihoods and property values. The relative stability of regional economic trends indicates neither a reduction nor increase will be necessary unless there is a major shift in the economic performance of the region. Unlikely 4.4 Stopbank upgrade issues One of the key infrastructure issues facing Environment Southland will be upgrading stopbank and flood protection infrastructure at specific locations. The Invercargill City Council is currently undertaking a strategic assessment of the Stead Street stopbanks within its control, with a view to upgrading the standard of protection. This will have flow-on impacts for the connecting network of stopbanks managed by Environment Southland. There is also work underway investigating work to improve the standard of protection of the network protecting the town of Gore. 4.4.1 Invercargill City stopbank upgrades Invercargill City Council has allocated $1.3 million in funding for the purposes of upgrading the Stead Street stopbank north of the New River Estuary in Invercargill. Unlike the majority of the region’s flood protection infrastructure, the Stead Street and Cobbe Road stopbanks are owned and managed by Invercargill City Council. The Stead Street stopbanks function to prevent inundation of the surrounding areas by coastal waters. The Ministry for the
21 Environment warns that increases in the mean sea level and frequency of storms, including cyclones, will increase high tide levels and the risks posed by storm surges. This means that the current Stead Street stopbanks are vulnerable to increasingly frequent overtopping events. The stopbanks protect the regionally significant asset of the Invercargill airport, as well as local property and businesses. The coastal and river flood defences in the area are an interconnected system, with overtopping of one defence frequently leading to knock-on effects as flood waters overtop other defences.
The Stead Street stopbank was overtopped most recently on 11 March 2016, which led Invercargill City Council to set aside funding to increase the standard of protection, pending the results of a strategic assessment for investment. Should Invercargill City Council decide on the basis of its assessment that an investment to improve the Stead Street stopbanks is required, Environment Southland will need to evaluate the capacity of the rest of the network to continue to provide the agreed standard of protection. In this regard Environment Southland and Invercargill City Council will be working closely to examine the need for and align any potential upgrades, including working collaboratively through the consenting and construction processes. An indicative timeline of works is provided in the diagram below. The project is complicated by the reliance on the outcome of Invercargill City Council’s strategic assessment, with no firm project start time.
Beyond the life of this strategy Environment Southland will also need to consider the capacity of the Kingswell and Otepuni stopbanks as part of wider review of the network within Invercargill City.
22 4.4.2 Options to manage Invercargill City stopbank upgrades Management options Implications of action Likelihood of undertaking action Work in conjunction with Invercargill City Council to establish project viability and scope. The decision to invest in stopbank upgrades in response to Stead Street upgrades will benefit from a collaborative approach. This approach will effectively manage impacts, minimise disruption and continue to provide a high standard of protection across the whole network. Certain – ongoing. Do nothing Maintaining an asset with regular overtopping increases costs. Regular water flowing over can cause scouring/erosion and reduces capacity of the asset. Risks of failing to properly upgrade the interconnected network compromise integrity of the system. The community would carry the increased level of risk.
Unlikely Invest in upgrading stopbanks along the Waihopai in response to Stead Street upgrades Staged approach Likely – as per diagram above Do it all at once Unlikely – due to cost 4.4.3 Gore stopbank upgrades The current Gore and Mataura urban flood protection scheme is designed to contain a flood event the size of the October 1978 event. This was considered to be a one in a hundred year event. However, a recent statistical review now indicates that a flood the size of the 1978 event would occur more frequently than every 100 years. Environment Southland is currently investigating options to improve the efficiency of the system. This work is largely focussed on increasing the speed at which water passes through the system to maximise discharge capacity.
4.4.4 Options to manage Gore stopbank upgrades Management options Implications of action Likelihood of undertaking action Do nothing The community would carry the increased level of risk. Unlikely Floodway clearance to improve channel efficiency Increasing the speed that flood waters pass through the system will lead to a higher discharge capacity. Ongoing vegetation management may increase the efficiency of the system. Particular activities such as clearing debris from the channel have higher costs and carry other risks to the community and environment.
Likely Stopbank upgrades Increasing the capacity of the network through stopbank upgrades will mean a significantly reduced risk to the urban and commercial areas of Gore township. Certain – particularly at the southern end of town
23 4.5 Lake Hawkins Pumping Station replacement The Lake Hawkins drainage facility is located on Stead Street West, Invercargill. The pump facility drains a catchment area of 1,556 ha, within the area from Curran Road, Bay Road, Stead Street and the Waihopai River (see Figure). An additional area south of Stead Street (rifle range) of 47.7 ha is also included in the catchment. The drainage area is known as Lake Hawkins and was reclaimed from the Upper Waihopai estuary in the early 20th century. The reclaimed land was originally drained by floodgates that allowed passage of water to drain the reclaimed area during low tides. Silting up of the outlets reduced the effectiveness of this system and led to the installation of the current Lake Hawkins pump facility in 1964. Currently, the drainage area consists of farm land and includes the strategic regional asset of Invercargill Airport. The airport is protected by a drainage bund around the property and discharges stormwater via a small pump station to the Lake Hawkins drainage channels. Replacement/Upgrade Proposal A consultant has been engaged (July 2017) to provide design options for the replacement or upgrade of the Lake Hawkins pump house. A number of significant risks to the set up and continued operational functionality of the pumping station mean that its replacement or upgrade is required. While the Lake Hawkins pump station is not technically part of Environment Southland’s flood protection scheme, the significance of the investment and the consequences of failing to ensure its continued operation qualify it for consideration in this strategy. At this stage, the council is committed to develop a comprehensive business case during the 2018/19 year to fully assess the upgrade options, timing, and funding arrangements. To be prudent, we have included an indicative amount of $2m in the 2021/22 budget (Year 4 of the LTP).
24 5. Assumptions and capital expenditure drivers 5.1 Performance over the next 10 years Under the Council’s Levels of Service commitments to the community in the 2018-2028 Long-term Plan, flood protection and control works are the only matter covered under this strategy. The performance target for this activity for the 2018-2028 period is as follows: 100% of schemes maintained through scheduled annual programmes to ensure that they provide protection to the agreed standard and the scheme assets are maintained as established in the adopted asset management plans.
The key decisions Environment Southland has to make in terms of the flood protection and control schemes it manages are about how much capital expenditure should be budgeted for renewals and upgrades. There are several projects under consideration covered in the most likely scenario section below. 5.2 When should infrastructure be maintained, repaired, renewed The expected lives of assets are set out in detail in the statement of accounting policies in the Long-term Plan. The infrastructural assets Environment Southland owns in relation to its flood protection and control schemes include the following asset types:  stopbanks and earthworks;  detention dams;  bridges;  large culverts; and  tide gate structures. It should be noted that each asset type includes all items that are required for the flood protection and control schemes to function. Stopbanks and earthworks are maintained in an “as new” condition and as such they do not incur a loss of service potential over time. Accordingly, stopbanks and earthworks assets are not depreciated for long-term planning purposes. Environment Southland commenced a full review of its flood protection assets in 2009 and this will continue through to 2018. The review is assessing the design standard and performance of the flood protection and control schemes. The physical inspections undertaken to date have confirmed that the condition of the schemes is consistent with the accounting lives being used in long-term planning.
Appendix 8.2 shows the extent of the flood protection systems and the areas of inundation potential. Appendix 8.3 shows the areas of potential liquefaction risk in relation to the constructed flood control works.
25 5.3 Other Assumptions Assumption/confidence Consequence Inflation adjustments have been made on the basis of BERL inflation indices. Changes to inflation will adjust the financial assumptions and may impact project cost benefit analysis and viability. Demographic issues been inferred on the basis of Statistics NZ estimates and projections. The relatively low levels of expected population change in Southland simplify longer term planning. Large changes in population, either decline or growth, will likely have impacts on required infrastructure improvements and the ability to pay for those improvements.
Policy and planning will limit growth in flood prone areas. Proactive planning and hazard mitigation will lessen the risk associated with flooding events incurred by activities or improvements located in flood prone areas. Data is correct and up-to-date. Data used in this strategy has been sourced from a variety of sources and is assumed to be correct. No expected legislation likely to impact infrastructure requirements. Long-term infrastructure planning has occurred on the assumption that no changes to legislation will force construction, upgrades, projects or expenditure beyond what is currently required.
Insurance. Environment Southland will continue to use Aon as its insurance broker. The reserves and insurance policies are included at Appendix 8.4. The majority of insurers, including the Insurance Council of New Zealand, and insurance intermediaries are signed up to the Paris Pledge for Action, the new universal climate agreement that was developed at the COP21 in Paris in 2015. The consensus from the industry is that climate change is a serious and emerging threat and that it is going to have a global impact on the industry. However, there is no consensus or agreement on whether the insurance industry will thrive or falter as the environment changes and the likelihood/consequence of natural disasters increase. There is also no universally agreed approach in response either regionally or internationally.
26 6. Most likely scenario Environment Southland’s general approach to infrastructure spending is currently conservative, largely due to predicted declines in population and ageing referred to in the demographic and economic issues sections of this strategy. This is despite the likely impacts of climate change making flood events more regular and more severe. Environment Southland will maintain the capacity to debt fund infrastructure improvements and repairs as required but is only planning to undertake a few major infrastructure investments in the period to 2048. It should be noted that any debt funding will be used as a last resort for exceptional circumstances where the Council feel this is necessary. The most likely investment decisions within the life of this plan have been considered in detail throughout this strategy and are summarised in the following section. Significant decisions about capital expenditure The projected costs relating to capital expenditure contained in the following table are estimates only. True costs will be determined as part of comprehensive scoping and feasibility studies and tested with the community through long-term or annual plans prior to any project commencing. Project Decision likelihood Start/completion date Estimated projected cost Proposed funding model Upgrade of the pump station at Lake Hawkins 2 Certain Development of the business case is to commence in 2018/19. This will consider the options, timing and funding requirements for the project.
Approximately $2m if the upgrade /replacement project proceeds. To be prudent, we have included an indicative amount of $2m in the 2021/22 budget (Year 4 of the LTP). Options will be considered as part of the business case review and will be presented to the community for feedback.. Potential Invercargill City stopbank upgrades Waihopai Possible Work to begin pending outcome of Invercargill City Council Stead Street stopbank strategic assessment. Possibly 10+ years. $3m-3.5m* (estimated $500 per lineal metre) Future Rating District budget Otepuni Possible Work to begin pending outcome of Invercargill City Council Stead Street stopbank strategic assessment. Possibly 10+ years.
$400,000-500,000* (estimated at $500 per lineal metre) Future Rating District budget Kingswell (true left bank only) Possible Work to begin pending outcome of Invercargill City Council Stead Street stopbank strategic assessment. Possibly 10+ years. $300,000-400,000* (estimated at $500 per lineal metre) Future Rating District budget Gore stopbank upgrades Certain 2018/19 $60,000 Mataura Rating District budget Progressive culvert upgrades or repairs. Likely Upgrades occur on an ad-hoc basis as and when required, either as a result of regular inspections or specific events.
Unknown *These figures are indicative only as at 2018 and will be subject to confirmation and inflation adjustment in future Long-term Plans or Annual Plans. Beyond the life of this plan it is expected that work may need to be undertaken on three urban stopbank networks protecting the urban or semi-urban areas of Wyndham, Otautau and Winton. Additional ongoing replacement and repair of infrastructure (generally culverts) will also continue to 2 While the Lake Hawkins pump station is not technically part of Environment Southland’s flood protection scheme, the significance of the investment and the consequences of failing to ensure its continued operation qualify it for consideration.
27 occur as those structures approach the end of their expected useable life. Assessing how and when this work will occur will form part of ongoing and future long-term planning processes. Project (beyond 2048) Decision likelihood If required as a result of performance and risk assessments of urban networks - upgrades of stopbanks and flood protection schemes . Wyndham Likely Otautau Likely Winton Likely
28 7. Financial forecasts of annual operating and capital expenditure Infrastructure Strategy Financial Forecasts of Annual Operating and Capital Expenditure 2018-2048 Combined Summary Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 671 609 619 632 646 660 675 690 705 721 3,839 4,260 4,726 5,246 Cost of Works 2,996 3,066 3,132 3,201 3,270 3,342 3,417 3,491 3,569 3,650 19,642 22,169 25,022 28,241 Transfer to Reserves 51 51 53 144 145 146 148 149 151 152 328 370 418 471 Depreciation 41 41 41 41 41 41 41 41 41 41 220 249 281 318 Overheads 395 364 369 378 386 394 403 412 421 431 2,313 2,611 2,946 3,325 4,155 4,131 4,213 4,395 4,487 4,583 4,683 4,783 4,887 4,995 26,342 29,659 33,393 37,601 Notes Assumptions Interest on Rating District funds is at 2.75% and will apply from the 2018/2019 year. Level of work required is reasonably constant over time.
Any major damage events will be covered by insurance and rating district funds. Costs are based on the 2018/2019 budget, and are funded in accordance with the Revenue and Financing Policy. Policy adopted of increasing and/or maintaining individual rating district's reservces and working capital balances determined by Council's "Reserves Expenditure Policy". 1. Costs included here are the costs of the River Management function relating to this rating district. They include the costs of managing the scheme. Only a portion of River Management costs (estimated at 15% of the River Management function) directly relate to maintenance of the flood protection assets (stopbanks etc). The rest is for costs associated with the scheme such as channel maintenance. Costs of the land drainage function are not included, nor are the costs of gravel monitoring. 2. Years 11-30 have had inflation applied by individual years, with the figures shown being the sum of the 5 year group.
Inflation rates are as per the 20 year average of Sept 2017 BERL "Planning and regulation" and "Water and environmental" (Table 3.2) adjustment percentages as applied in the Long-term Plan apart from Personnel and Direct costs which apply the BERL "All salary and wage rates-local government sector" adjustor (Table 5.2).
29 Infrastructure Strategy Financial Forecasts of Annual Operating and Capital Expenditure 2018-2048 (See Notes and Assumptions on Combined Summary sheet) Aparima Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 64 68 69 71 72 74 76 77 79 81 439 502 573 655 Cost of Works 263 269 275 281 287 293 300 306 313 320 1,720 2,053 2,450 2,924 Transfer to Reserves 4 4 4 4 4 4 4 4 4 4 25 25 25 25 Depreciation 0 0 0 0 0 0 0 0 0 0 15 15 15 15 Overheads 44 43 44 45 46 47 48 49 50 51 245 292 349 416 375 384 392 401 409 418 428 437 447 457 2,444 2,887 3,412 4,035 ICC Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 165 159 162 166 169 173 177 181 185 189 1,068 1,220 1,394 1,592 Cost of Works 302 308 315 322 329 336 344 351 359 367 1,998 2,385 2,846 3,397 Transfer to Reserves 60 61 63 64 66 67 69 71 72 74 400 400 400 400 Depreciation 20 20 20 20 20 20 20 20 20 20 100 100 100 100 Overheads 114 102 103 105 108 110 112 115 117 120 384 458 547 653 660 650 663 677 691 706 722 737 753 770 3,950 4,563 5,287 6,142 Makarewa Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 29 31 31 32 33 33 34 35 36 36 276 316 361 412 Cost of Works 182 187 191 195 199 203 208 213 217 222 1,314 1,568 1,871 2,233 Transfer to Reserves 0 0 0 0 0 0 0 0 0 0 20 20 20 20 Depreciation 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Overheads 22 20 21 21 21 22 22 23 23 24 95 113 135 161 233 237 242 248 253 259 264 270 276 282 1,705 2,017 2,387 2,826
30 Infrastructure Strategy Financial Forecasts of Annual Operating and Capital Expenditure 2018-2048 (See Notes and Assumptions on Combined Summary sheet) Mataura Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 297 229 231 236 241 247 252 258 264 270 1,751 2,000 2,285 2,611 Cost of Works 984 1,007 1,028 1,051 1,073 1,097 1,122 1,146 1,172 1,198 6,240 7,447 8,888 10,607 Transfer to Reserves 0 0 0 90 90 90 90 90 90 90 0 0 0 0 Depreciation 9 9 9 9 9 9 9 9 9 9 45 45 45 45 Overheads 156 143 146 149 152 156 159 163 166 170 635 757 904 1,079 1,446 1,388 1,414 1,535 1,566 1,598 1,632 1,666 1,700 1,737 8,671 10,249 12,122 14,342 Oreti Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 86 92 93 95 97 99 102 104 106 109 737 842 962 1,099 Cost of Works 855 875 894 913 933 953 975 996 1,018 1,042 6,051 7,221 8,618 10,285 Transfer to/(from) Reserves -32 -33 -33 -34 -35 -35 -36 -37 -38 -39 -205 -205 -205 -205 Depreciation 11 11 11 11 11 11 11 11 11 11 55 55 55 55 Overheads 53 50 51 52 53 54 55 57 58 59 239 286 341 407 974 995 1,016 1,038 1,060 1,083 1,107 1,131 1,156 1,182 6,877 8,199 9,771 11,641 Te Anau Basin Rating District Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year 7 Year 8 Year 9 Year 10 Years 11-15 Years 16-20 Years 21-25 Years 26-30 2018/2019 2019/2020 2020/2021 2021/2022 2022/2023 2023/2024 2024/2025 2025/2026 2026/2027 2027/2028 2028/2033 2033/2038 2038/2043 2043/2048 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 $000 Operating and Capital Expenditure Personnel and Direct Costs 30 31 32 33 33 34 35 36 36 37 266 303 347 396 Cost of Works 410 420 429 439 448 458 468 479 489 501 2,906 3,468 4,139 4,939 Transfer to Reserves 19 19 19 19 20 20 21 21 22 22 125 125 125 125 Depreciation 1 1 1 1 1 1 1 1 1 1 5 5 5 5 Overheads 6 5 5 5 5 5 6 6 6 6 17 20 24 28 466 476 486 497 508 519 531 542 554 567 3,319 3,921 4,640 5,493
31 8. Appendices Appendix 8.1 – Inventory of assets – from 2017 asset management plans. Appendix 8.2 – Catchments showing floodable areas and infrastructure locations Appendix 8.3 – Potential Liquefaction Risk Areas Appendix 8.4 – Insurance and Reserve Policies
32 Appendix 8.1 - Inventory of Environment Southland owned and managed assets Inventory of Assets – Aparima Rating District Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Gummies Bush - Dunrobin Fairfax – Otautau 30,720 Left 1988 Visual annual Gummies Bush - Dunrobin Wreys Bush - Opio 4,650 Right 1990 Visual annual Gummies Bush - Dunrobin Fairfax – Otautau 7,202 Right 1988 Visual annual Gummies Bush - Dunrobin Gummies Bush - Thornbury 8,181 Left 1980 Visual annual Thornbury Town Thornbury Town 615 Left 1985 Visual annual Gummies Bush - Dunrobin Wreys Bush - Opio 6,562 Left 1990 Visual annual Gummies Bush - Dunrobin Drummond - Groyne 92 Left 1978 Visual annual Gummies Bush - Dunrobin Opio Kempthorne & Oths 1,470 Right 1976 Visual annual Gummies Bush - Dunrobin Opio Kempthorne & Oths 1,045 Left 1976 Visual annual Gummies Bush -Dunrobin Otautau - Wreys Bush 12,734 Left 1989 Visual annual Gummies Bush - Dunrobin Gummies Bush - Thornbury 8,745 Right 1990 Visual annual Otautau Town Otautau Stream Town 2,645 Left 1988 3 monthly Otautau Town Otautau Stream Town 3,083 Right 1988 3 monthly Culverts and Structures Name Location Type of construction Date of construction Monitoring Maintenance Fleck's L/B U/S Gummies Bush Bridge Wood stave culvert 1800 mm diameter 1989 Visual annual When required Sharp's L/B U/S Gummies Bush Bridge Wood stave culvert 1500 mm diameter 1989 Visual annual When required Low's L/B U/S Yellow Bluffs Bridge Wood stave culvert 1500 mm diameter 1989 Visual annual When required Anderson's R/B U/S Gummies Bush Bridge Wood stave culvert 1500 mm diameter 1989 Visual annual When required Irving's R/B U/S Yellow Bluffs Wood stave culvert 2400 mm diameter 1989 Visual annual When required
33 Inventory of Assets – Invercargill City Council Rating District Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring ICC Urban Waihopai Beatrice St - Dee St 1,250 Left 1991 3 monthly ICC Urban Waihopai Borstal Bridge - Beatrice St 914 Left 1991 3 monthly ICC Urban Waihopai Niagara saw mill at Kennington 1,726 Both 1989 3 monthly ICC Urban Waihopai North Rd - Queens Dr 1,358 Left 1991 3 monthly ICC Urban Waihopai North Rd - Queens Dr 1,282 Right 1991 3 monthly ICC Urban Waihopai Queens Dr - Racecourse Rd 1,600 Right 1991 3 monthly ICC Urban Waihopai Queens Dr - Racecourse Rd 1,623 Left 1991 3 monthly ICC Urban Waihopai Racecourse Rd - Dam 1,273 Left 1991 3 monthly ICC Urban Waihopai Racecourse Rd - Dam 1,273 Right 1991 3 monthly ICC Urban Waihopai Rail Bridge - North Rd 433 Right 1991 3 monthly ICC Urban Waihopai Rail Bridge - North Rd 312 Left 1991 3 monthly ICC Urban Waihopai Stead St - Borstal Bridge 1,408 Left 1991 3 monthly ICC Urban Waihopai Stead St - Victoria Ave 1,500 Right 1991 3 monthly ICC Urban Waihopai Victoria Ave - 2400 2,400 Right 1991 3 monthly ICC Urban Waihopai Victoria Ave 2400- 3200 800 Right 1991 3 monthly ICC Urban Kingswell Bluff Rd - McMillan St 3,015 Left 1987 3 monthly ICC Urban Kingswell Bluff Rd - McMillan St 2,703 Right 1987 3 monthly ICC Urban Otepuni Lindisfarne St - Rockdale Rd 1,797 Both 1990 3 monthly ICC Urban Otepuni Elles-Lindisfarne St 1,135 Right 1990 3 monthly ICC Urban Otepuni Elles-Lindisfarne St 927 Left 1990 3 monthly ICC Urban Otepuni Ness-Elles Rd 290 Both 1989 3 monthly ICC Urban Otepuni Conon-Ythan-Ness St 1,145 Both 1989 3 monthly ICC Urban Otepuni Clyde-Nith-Conon St 1,166 Both 1989 3 monthly ICC Urban Otepuni Liddell St – Clyde St 130 Both 1989 3 monthly ICC Urban Otepuni Railway – Liddell St 25 Both 1989 3 monthly Clifton Drainage Clifton 4,200 Right 1970 3 monthly Dams Name of Dam Location Construction Date Construction Type Max height Volume retained Crest length Monitoring Maintenance Kingswell Dam Kingswell Stream 1988 Earth 5.5m 500,000m 3 300m Visual 3 monthly/ Reg Eng annually When required Otepuni Dam Otepuni Stream 1994 Earth 2.5m 975,000m 3 400m Visual 3 monthly/ Reg Eng annually When required Waihopai Dam Waihopai River 1990 Earth 5.5m 2,900,000m 3 1,273m Visual 3 monthly/ Reg Eng annually When required Culvert Name Location Type of construction Date of construction Monitoring Maintenance ICC Railway Culvert Otepuni Stream 2x2100 dia concrete pipes 156.5m length 1990 Visual annual When required ICC Auburn Road Culvert Waihopai River 2x1600 dia concrete pipes with flapgates 1990 Visual annual When required
34 Inventory of Assets – Makarewa Rating District Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Makarewa Stopbanks Mako Gorge 2,250 Right 1969 Visual annual Makarewa Stopbanks Mako Gorge 900 Left 1969 Visual annual Makarewa Stopbanks Tanner Rd - Otapiri Gorge Rd 7,282 Right 1968 Visual annual Makarewa Stopbanks Tanner Rd - Otapiri Gorge Rd 8,018 Left 1968 Visual annual Culvert Name Location Type of construction Date of Construction Monitoring Maintenance Mako Gorge L/B at peg 2 Wood stave culvert 1,500 mm diameter 1969 Visual annual When required
35 Inventory of Assets – Mataura Rating District Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Athol Ex MOW Bank U/S Black Bridge 5,100 Both 1956 Visual annual Athol Parker/Soper Athol J515 2,000 Left 1970 Visual annual Athol Parker/Soper Athol J515 1,810 Right 1965 Visual annual Cattle Flat J608 24,470 Both 1973 Visual annual Eyre Creek Eyre Creek J78 78/1 248 5,250 Left 1965 Visual annual Eyre Creek Eyre Creek J78 78/1 248 6,050 Right 1965 Visual annual Garston L Naylor 2,812 Left 1972 Visual annual Garston L Naylor & K Copland 760 Both 1969 Visual annual Garston McCaughan Flood Banks 880 Left 1954 Visual annual Garvie Burn Garvie Burn Freshford 1,200 Both 1971 Visual annual Gore Urban J617/5/1 Pope St upgrade 485 Right 1981 3 monthly Gore Urban Rail Embankment - Land purchase 550 Right 1987 3 monthly Gore Urban J617/5/1 East Gore upgrade 250 Left 1984 3 monthly Gore Urban Job 600 5,300 Both 1972 3 monthly Lower Mataura Floodway Upstream Gorge Rd Bridge 8,200 Right 1986 Visual annual Lower Mataura Floodway Titiroa Stream L/B 700 Left 1984 Visual annual Lower Mataura Floodway Downstream Gorge Rd Bridge 7,300 Right 1986 Visual annual Mataura Waikaia D/S Town J51 2,020 Right 1954 Visual annual Mataura Upper Waikaia J Thompson 1,889 Right 1991 Visual annual Mataura Upper Waikaia J194 20,100 Both 1953 Visual annual Mataura Town Charlton No 1 J617/5/2 Upgrade 680 Right 1981 3 monthly Mataura Town J706 1,720 Left 1970 1985 3 monthly Mataura Town J706 3,250 Right 1970 1985 3 monthly Mataura Town Waimumu Stream J182/1 4,373 Left 1985 Visual annual Wyndham Town North J765/2 Upgrade 3,317 Left 1985 3 monthly Wyndham Town South J765/1 Upgrade 2,073 Left 1984 3 monthly Culverts and Structures Name Location Type of construction Construction date Monitoring Maintenance Black Creek Black Creek, Lower Mataura Concrete headwalls 2 X 1,600 dia RCC 1986 Visual annual When required Titiroa Tide Gate Structure Titiroa Stream Concrete/ steel door 1987 Visual annual When required Gorge Creek Flood Gate Gorge Creek, Lower Mataura Concrete support 1986 Visual annual When required
36 Inventory of Assets – Oreti Rating District Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Five Rivers Acton Stream 4,300 Both 1963/1967 Visual annual Five Rivers Irthing Stream 2,500 Both Visual annual Five Rivers Cromel Stream 750 Right Visual annual Stage 1 Urban/rural Waikiwi Gap 1,270 Left 1991 Visual annual Stage 1 Urban/rural Waikiwi Stream 1,601 Left 1992 Visual annual Stage 1 Urban/rural Sinclair - Whyte stopbank 3,012 Right 1992 Visual annual Stage 1 Urban/rural Erskine Flood bank 4,020 Right 1992 Visual annual Taramoa to Lumsden Centre Bush - Fernhill 6,532 Right 1990 Visual annual Taramoa to Lumsden Ram Hill - Lumsden 10,969 Right 1990 Visual annual Taramoa to Lumsden Fernhill - Dipton 14,813 Right 1992 Visual annual Taramoa to Lumsden Ram Hill - Lumsden 15,111 Left 1990 Visual annual Taramoa to Lumsden Lochiel - Winton 15,580 Left 1991 Visual annual Taramoa to Lumsden Winton - Centre Bush 11,066 Left 1990 Visual annual Taramoa to Lumsden Iron Bridge - Branxholme 1,692 Left 1991 Visual annual Taramoa to Lumsden Iron Br – Waianawa Stream 2,600 Right 1991 Visual annual Taramoa to Lumsden Branxholme - Lochiel 11,477 Right 1992 Visual annual Taramoa to Lumsden Lochiel - Winton 11,703 Right 1991 Visual annual Taramoa to Lumsden Winton - Centre Bush 9,714 Right 1990 Visual annual Taramoa to Lumsden Dipton - Ram Hill 11,279 Right 1991 Visual annual Taramoa to Lumsden Centre Bush - Fernhill 4,615 Left 1990 Visual annual Taramoa to Lumsden Fernhill - Dipton 14,517 Left 1992 Visual annual Taramoa to Lumsden Branxholme - Lochiel 10,651 Left 1992 Visual annual Taramoa to Lumsden Iron Bridge - Branxholme 3,430 Right 1991 Visual annual Taramoa to Lumsden Dipton - Ram Hill 7,839 Left 1991 Visual annual Lumsden to Mossburn Lumsden - Mossburn between Mossburn Bridge to Lumsden Bridge Intermittent over 17kms Both 1969 Visual annual Lower Oreti Waianawa Stream 1,168 Right 1989 Visual annual Lower Oreti Waitoru Stopbanks 7,570 Left 1969 Visual annual Dams Name of Dam Location Construction Date Construction Type Max height Volume retained Crest length Monitoring Maintenance Lower Oreti Detention Dam Lower Oreti River 1988 Earth 1.4m - 750m Visual 3 monthly When required Winton Dam Winton Stream 1989 Earth 5.0m 1,500,000m 3 440m Visual 6 monthly/ Reg Eng annually When required Claytons Dam Clayton Drain 1984 Earth 1.8m 50,000m 3 540m Visual annual When required Culverts and Structures Name Location Construction Type Construction Date Monitoring Maintenance Price's R/B U/S Iron Bridge Wood stave culvert 2,100 dia 1990 Visual annual When required Ferry Road Spill over bank Ferry Rd Concrete culvert 1,200 dia / flapgate 1990 Visual annual When required Hubber's R/B Oreti River Wood stave culvert 2,100 dia 1990 Visual annual When required Milligan's R/B D/S Dipton Wood stave culvert 1,200 dia 1990 Visual annual When required J E Duthie L/B U/S Lochiel Br Plastic culvert 1,800 dia 2017 Visual annual When required McDonald's L/B D/S Dipton Wood stave culvert 1,800 dia 1990 Visual annual When required Otakau Stream Otakau Stream Concrete structure 1992 Visual annual When required Otakau Stream Otakau Stream Wood stave culvert 1992 Visual annual When required O'Callaghan's R/B Oreti River Benmore Wood stave culvert 1,500 dia 1990 Visual annual When required
37 Duthie's R/B Oreti River Wood stave culvert 1,200 dia 1989 Visual annual When required McKenzie’s R/B Oreti River Wood stave culvert 1,800 dia 1990 Visual annual When required Other Existing Pumping Station - Lake Hawkins Drainage Name Location Construction Date Volume pumped (cumecs) Monitoring Maintenance Lake Hawkins Pump Station Stead Street 1956 2.25 Proposed Pumping Station Replacement/Upgrade – Lake Hawkins Drainage (pending 2018/2019) Name Location Construction Date Volume pumped (cumecs) Monitoring Maintenance Lake Hawkins Pump Station Stead Street 2018/2019? 3.0
38 Inventory of Assets – Te Anau Basin Rating District Whitestone Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Whitestone River Whitestone Lynwood FS 11,444 Left 1965 Visual annual Whitestone River Mt Prospect Station 5,450 Left 1965 Visual annual Whitestone River Fogartys Flat 2,755 Right 1965 Visual annual Whitestone River Whitestone Lynwood FS 2,500 Right 1965 Visual annual Dam Name of Dam Location Construction Date Construction Type Max height Volume retained Crest length Monitoring Maintenance Dawson City Stony Creek 1973 Earth 2.74 m 176,000m 3 240 m Visually annually When required Upukerora Stopbanks Name of Facility Section Distance (m) Bank Completed Monitoring Upukerora River Dale Farm Settlement 4,183 Left Jan 1972 Visual annual Detention Dam Detention Dam (Identified spatially only) Snowden Farm Settlement 240 B2043 Nov 1982 Visual annual Ellis Creek/Lagoon Creek/Reids Dale Creek (ELR) Dam Name of Dam Location Construction Date Construction Type Max height Volume retained Crest length Monitoring Maintenance Lagoon Creek Lagoon Creek 1971 Earth 4.22m 142,000m 3 150m Visually annually When required
39 Appendix 8.2 – Catchments showing floodable areas and infrastructure locations Aparima Catchment
40 Mataura Catchment
41 Oreti Catchment
42 Waiau Catchment Note: The stopbanks shown on this map are within the Te Anau Basin Rating District. The stopbanks around Tuatapere are owned and managed by the Southland District Council.
43 Appendix 8.3 – Potential Liquefaction Risk Areas
44 Appendix 8.4 – Insurance and Reserve Policies Policy for repairs to flood protection infrastructure from damage caused by floods and other natural disasters Council will continue the commitment to the long-term risk management regime that requires annual works programmes for the separate rating districts aimed at maintaining all assets at their desired service level standard, as set out in the respective asset management plans, and to provide sources of funds for works that make good against loss and/or damage to those assets. To achieve this: 1. Council adopts a risk management strategy of:  obtaining/maintaining commercial insurance cover for dams, structures and culverts at the level of cover specified through Council’s Asset Register;  obtaining/maintaining insurance cover for separate rating district flood protection scheme stopbanks at the level of cover specified through Council’s Asset Register, with the insurable replacement value updated annually by the Consumer Price Index;  establishing, increasing and/or maintaining separate rating district disaster reserve balances and separate rating district working capital balances totaling $5M;  upon establishing that balance, reviewing the need to build these reserves to a balance of $10.45M; 2. Council retains the Regional Disaster Damage Reserve and the policies relating to its purpose and use; 3. until the relevant reserve has reached the required levels, each rating district will contribute on an annual basis to their Separate Rating District Disaster Reserve, a sum equal to the commercial insurance premium for stopbanks that applied in the 2004/05 financial year (inflation-proofed through the Consumers Price Index), less that district’s share of the LAPP premium implemented 2005/06, along with any additional sum identified in their annual budget from time to time (note that separate rating district reserves are for disasters within that catchment, but in widespread flood events there is provision for loans to be made from one catchment’s funds to another); 4. existing Separate Rating District Disaster Reserve funds are amalgamated in investment funds held with investment managers. Any expenditure from individual rating district funds will be funded from realisation of the investment funds. Any agreed expenditure in excess of individual rating district funds will also be funded from investments but represented by an internal loan asset; 5. each separate rating district will continue to accumulate annual surpluses within their district’s balances, being working capital; 6. the separate rating district disaster reserves and working capital balances will attract interest on balances on an annual basis; 7. deductibles resulting from a claim on commercial insurance for dams, structures and culverts and/or LAPP coverage of stopbanks, will be allocated to those catchment rating districts making the claims on a pro-rata claim amount basis;
45 8. district working capital reserves will be used as first call, up to 75% of the balance available, for the cost of uninsured asset repairs before a claim on that district’s balance of the Separate Rating District Disaster Reserve will be eligible. District working capital will be 100% expended before that district can “borrow” from other district’s balance within the Separate Rating District Disaster Reserve; 9. river event repair must be equal to at least 75% of the district’s annual separate rate to qualify for a claim on that district’s portion of the Separate Rating District Disaster Reserve to be considered by Council; 10. river event repair requirements in excess of that district’s share of the reserve balance are eligible for application to Council for access to the balance of the Separate Rating District Disaster Reserves; 11. in any one event, applications to Council will include:  identification of the qualifying event or disaster and the agreed costs and level of funding involved;  detail of the standard of repair – to pre-disaster condition and/or relocation and/or betterment;  discussion of the community vs individual benefits and consequently any cost share arrangement between the ratepayer/landowner, catchment ratepayer and general ratepayer (Note: It would be unrealistic for claimants to demand or expect general fund input to repairs when those repairs are being funded through drawdown of reserves. Under the Council’s funding policy, the Separate Rating District Disaster Reserve is built with a 30% general fund contribution);  the priority of works;  the ability of ratepayers to pay to restore reserve balances;  proposals for the method of replenishment of funds used including timeframes and funding methods;  recognition that interest on the Separate Rating District Disaster Reserves drawn in excess of the separate rating district’s balance will be charged at the same rate as interest is credited to the reserve; 12. the priority for works resulting from river events will be in the order of community benefit works before individual benefit works.
Adopted by Council – 22 June 2005 (A136061) Note: Insurance provider changed from LAPP to Aon (as Broker) as of 1 July 2017 (A337775)
46 Policy in respect of Regional Disaster Damage Reserve The Reserve may be available for funding recovery from regional disasters:  where a regional or local civil defence emergency is declared, or  which are:  sudden and catastrophic;  beyond the scope of normal response processes;  beyond usual human experience;  the cause of excessive damage;  the cause of widespread social upheaval. Possible regional disaster damage could ensue from:  river events;  climatic events;  civil defence emergency situations of flood, earthquake or land movement;  tsunami;  oil spills;  coastal environmental events;  ecological events;  animal health events e.g. foot and mouth, Bovine Tb;  social and economic events;  chemical or technological disasters. 1. Each year at the time the general rate is set Environment Southland will consider the level of allocation from rates to the Regional Disaster Damage Reserve.
2. Except in emergencies this reserve is to be drawn upon only after specific Council approval following the consideration of a detailed report. 3. The following principles will be applied when considering the use of the reserve: (a) the Regional Disaster Damage Reserve will be used as a fund of last resort; (b) the reserve will be used for repair or replacement after damage to Southland Regional Council assets or assets for which Environment Southland agrees it has a financial responsibility; (c) where event repairs qualify for a claim on a district disaster reserve, the claim on that reserve will be matched on a dollar for dollar basis by the Regional Disaster Damage Reserve.
(d) any events excluded by the criteria can be included on a case by case basis by Environment Southland at the particular time. 4. General criteria to be considered for possible use of funds from the Regional Disaster Damage Reserve will include whether: (a) Environment Southland has a statutory responsibility to assist; (b) the request comes from individuals, a community or the region; (c) there is existing insurance coverage; (d) the policies in 3.1 should be addressed prior to this section; (e) Government funds are able to be accessed; (f) other funding sources are more appropriate and available;
47 (g) immediate/emergency action is warranted; (h) payment should be in the form of grants, subsidies or loans; (i) any agreement should be sought to protect Council’s interests; (j) other claims are pending or potential. 5. Funding criteria to be considered for possible use of funds from the Regional Disaster Damage Reserve will include: (a) reference to financial policies on investment levels when considering how funds should be distributed and restored; (b) detailed provision for restoration of investment funds, should this be required; (c) reference to whether services are reduced to cut costs on specific and/or general rates are increased, to offset reduced investment returns as a consequence of a draw on the reserve.
Adopted by Council - 13 December 1995
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