Plan Highlights – Key Issues and Projects Major projects and estimated cost downstream upgrades are provided in a timely manner. Evaluation and Major capital projects installation of effective stormwater quality control techniques for new Area Inflated value subdivisions, and retrofit of existing reticulation, will also occur. (millions) Blenheim 2018–19 Pipelines $20.9 Climate Change 2018–28 Pump stations $21.8 Extreme weather events are likely to become more frequent and more intense, and sea level rise is anticipated. These changes have implications for 2018–28 Treatment plant $9.6 the effectiveness of rivers to discharge to the sea and the outfall of the $9.9 drainage network. 2018–28 Pipelines maintenance and renewals Major projects and estimated cost Picton 2018–28 Pump station upgrades $4.8 $12.3 Area Major capital projects Inflated value 2018–28 Treatment plant (millions) Riverlands 2018–28 Sewerage treatment for $26.6 Blenheim 2021–24 Murphy’s Creek Pipeline $4.2 industrial capacity upgrade $4.3 2025–28 Graham, Stephenson, Stuart St $4.3 Seddon 2018–28 Sewerage treatment upgrade and Francis St Pipelines St Andrews 2018–26 Pipelines $1.2 2018–28 Other Pipelines $4.6 Havelock 2018–28 Sewerage treatment upgrades $8.9 2019–21 Water Quality Infrastructure for $0.5 Kinross St Stormwater Rivers and Land Drainage Stormwater Strategy The stormwater strategy provides a Earthquake Damage comprehensive framework to manage The 2016 Kaikoura earthquake damaged some of the existing stopbanks and both the quality and quantity of river edge protection, which have now been repaired. stormwater. It also provides for an overhaul of the resource consent The potential for significant earthquakes to occur in the future remains. The structure for Blenheim’s stormwater, best way to prepare for earthquakes is to ensure stopbanks in the eastern which will involve review and areas of Blenheim, which are more prone to liquefaction, are inspected and consolidations of existing stormwater any damage is repaired as soon as possible after an event. discharge consents. Stormwater Management Area Plans will be developed for each of the different areas in Blenheim to implement the strategy. The New Works and Future Planning strategy’s goals and approach will be extended to other townships over time. The Wairau floodplain’s major rivers and stopbanked floodways cover 20,000 Urban Growth Strategy hectares of fertile land around Blenheim and this is the Council’s major river control and drainage activity. All but two of the Wairau floodways are up to the Urban growth in Blenheim is largely to the north and west of the town. As the desired level of service, and works are underway to upgrade the lower Wairau stormwater will need to flow to the eastern coast, it will be important to ensure and Riverlands Co-op floodways to complete the capacity upgrades. 2018-2028 Long Term Plan Page 9