Young IPWEA Snappy Presentations

Determining the criticality of central Auckland’s road network

Kester Rebello
Co-authors: Karan Jaggi, Seosamh Costello, Daniel Blake, May Oo, Temitope Egbelakin & James Hughes

A new criticality framework for road networks is successfully applied to Auckland, and provides opportunities for improved resilience assessments.

The failure or disruption of critical transportation routes can have substantial impacts on societal wellbeing. Determining the criticality of transportation routes is thus of crucial importance for infrastructure providers and emergency management officials as it enables appropriate resilience assessments, and targeted improvement/intervention and investment strategies, to be conducted. We apply and validate a recently developed criticality framework for road networks to the central Auckland area. Following an initial pilot of the framework, amendments were made to the framework logic to account for roads providing little essential service in terms of the recovery function. Subsequent results, when applied to the central Auckland area, demonstrate that the amended framework is suitable for determining critical roads, and can therefore help inform future assessments of infrastructure resilience.

Kester Rebello and Karan Jaggi, from the University of Auckland, conducted the majority of research for this project and were supervised by Assoc Prof. Seosamh Costello in the Department of Civil and Environmental Engineering. Daniel Blake is a Postdoctoral Fellow for the Resilience to Nature’s Challenges (infrastructure) and QuakeCoRE programmes, based at the University of Canterbury. May Oo (Auckland Transport), James Hughes (Tonkin and Taylor) and Dr Temitope Egbelakin (Massey University) also contributed to the project.

Leveraging water supply resilience for Chatham’s from wharf upgrade
Logan Boyd
Co-authors: Richard Bennett, Kirsten Norquay, Owen Pickles

Working collaboratively with local contractors identifies a low cost option to provide resilient water supply for Waitangi and Te One.

The Chatham Islands’ remoteness and small population makes provision of a resilient, affordable water supply a key Council priority. The Waitangi community (about 200 people) relies on a single bore with summer demand exceeding aquifer sustainable yield, whilst nearby Te One (about 100 people) relies on rainwater. Several significant industries also wish to connect to the Waitangi supply or increase their take.
An opportunity was identified to use the bore constructed for the wharf upgrade project that would otherwise have been abandoned in 2018. The preferred low-cost option includes a new treatment plant and reservoir, gravity flow in network, reuse of existing reservoirs for network storage/ fire-fighting, and retains existing bore and treatment plant for emergency use.

Logan began his engineering career with Stantec New Zealand, finalising his degree in November 2016. Logan has enjoyed a variety of work in his short time at Stantec but his most notable work has been for the Chatham Island Council. This is where he gained his interest in hydraulic modelling when he was involved with designing a cost effective solution to supply remote townships with a resilient water supply.

From link to place: repurposing Te Moana Road
Chris Groom

The completion of the Kapiti Expressway in February 2017 disrupted traffic flows along Te Moana Road which is the main link between Waikanae Beach and Waikanae town centre. Overnight the traffic volume along Te Moana Road halved and traffic flowed towards the Expressway instead of through the Town Centre. This change presents Kapiti Coast District Council (KCDC) with the opportunity to redesign Te Moana Road to be more pedestrian and cyclist friendly. To take advantage of this opportunity a program of small projects was developed including new footpaths, pedestrian crossings and traffic calming. These changes will make the corridor more resilient to climate change as they help to achieve KCDC’s sustainable transport strategy.

Chris has three years’ experience as a transport planner in Wellington. Chris joined Jacobs in 2017 from the Service Design Team at Greater Wellington Regional Council which is responsible for the timetabling and route design of bus services in the Wellington Region. At Greater Wellington, Chris tool a leading role in numerous service reviews which provided improvements in reliability, capacity and simplicity for customers.

Rising expectations – sea level rise effects on the stormwater system at Auckland International Airport
Edwin Nixon
Co-author: Martin Fryer

Human-induced or not, climate change is inevitable. Auckland International Airport is building resilience by modelling and addressing future climate change disruption to their stormwater system.

Climate change, particularly sea level rise (SLR), is expected to have a highly disruptive effect on existing stormwater systems. Auckland International Airport is New Zealand’s largest airport and borders the Manukau Harbour. The Airport has piped stormwater reticulation which utilises six ponds/wetlands to provide stormwater treatment before discharging to the harbour. All of these stormwater devices are expected to be regularly inundated due to SLR, affecting their hydraulic and treatment performance. SLR is also expected to affect the hydraulic performance of the upstream stormwater system, potentially increasing flooding. How will Auckland Airport’s stormwater system and associated infrastructure cope with SLR and other predicted climate change effects? This question must be answered and the implications addressed to build resilience to climate change at Auckland International Airport.

Edwin joined PDP as a graduate engineer in early 2016. Edwin graduated with a bachelor’s degree in civil engineering from the University of Auckland and has gained valuable experience on a wide variety of stormwater projects in his two years at PDP. He has been involved in stormwater design, construction and modelling on innovative projects such as the Three Kings Quarry redevelopment.

Maintaining access on the Otago Peninsula, and securing access for the future
Josh von Pein
Co-authors: Andy Lyon, Kieran Trainor

The Dunedin City Council with Vitruvius engaged as project managers completed an intensive hydrological, geotechnical and safety program of works, which coincided with a significant weather event, to significantly improve resilience and safety along an isolated, slip prone, ecologically and historically important commuter and tourist route.

Highcliff Road is a narrow and winding road along the ridges of the Otago Peninsula which forms an important tourist route for Dunedin City, and access to many residents. The route is highly susceptible to landslips, for which the Dunedin City Council implemented a proactive resilience programme.
The improvement works included hydrological, geotechnical and safety a reviews using drone technology, drainage and culvert upgrades, construction of new retaining structures, road realignment, and the installation of road safety measures, in areas with high historical and ecological importance.
A State of Emergency was announced during constructing exacerbating existing slips and revealing new ones, however work was complete on time, on budget, for the benefit of counters, and commercial tourist operators alike.
The Safety improvements had and immediate effect, with a driver impacting a length of wire rope, above a 200m drop only weeks after installation.

Chartered Professional Civil Engineer with approximately 13 years of relevant design and construction experience, working for respected contractors, consultants, surveyors and local authorities in New Zealand, Australia and the United Kingdom.

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