Council Conversations:

Let's connect, share an idea, talk about issues and work on solutions as a team. Followed by networking.

To join email rachael.armstrong@hbrc.govt.nz 

 

Council Conversations: 8 May, 12:00pm

Geotechnical Investigations

Let’s talk about Geotechnical Investigations for soil properties, what investigations are we specifying and how are we using the information? COUNCIL ONLY

Register in advance for this meeting

 

Council Conversations: 29 May, 12:00pm

Financial Delegation in Operational Roles

Financial Delegation in Operational Roles Let's have a chat about financial delegation in operational roles. The purpose is to share documents and ideas to help each other ensure our delegations are effective for the work we do.

If you have an operational role with a financial delegation - this is a conversation for you. COUNCIL ONLY

Register in advance for this meeting

 

 

Rock Design for River Works

Date 28 March 2025

Location Auckland

Time 9am-2pm (includes lunch)

Cost $500 plus GST.

Council staff $100 discount 

A workshop for designing rock revetments and groynes for River Works

A half-day workshop providing details of best practice methods for designing rock for use in river works. A high-level introduction to geomorphology will be provided for the purpose of understanding how rock works can affect river processes as well as key concepts affecting general scour design. A summary of tools for quantifying hydrological and hydraulic design parameters will be presented followed by guidance on when rock should be considered as a management tool. The design process will then be explained for rock revetments (rock lines) and groynes including general arrangement geometry, sizing, filters, and specifications. Examples will be provided of recent projects including where design/cost/maintenance trade-offs were considered.

Key themes

• Brief introduction to geomorphology – how rivers work.
• Outline tools for quantifying key design inputs – hydrology, hydraulics.
• When to use rock.
• General arrangement geometry for groynes & revetments.
• Estimating general scour (geomorphic change);
• Estimating local scour.
• Sizing rock using three different methods.
• Design of granular and geotextile filters.
• Key specifications for rock.

Outcomes

A better understanding of designing rock for use in river works.

Who would benefit?

Local authority engineers and asset managers, consultants and contractors actively involved in river management, or who have a specific interest in and experience of rivers and their management.

Presenter

Kyle Christensen - River Engineering Consultant

Spaces limited

To register email Rachael.Armstrong@hbrc.govt.nz

International Adaptation Futures conference is taking place this year in New Zealand for the first time.

This landmark hybrid event will unite over 1500 scientists, policymakers, and changemakers to collaborate on solutions for climate resilience and adaptation.

What makes #AF2025 unique?

• Indigenous Solutions & Small Island States: Dive into essential discussions tailored to these communities.
• Art Outreach: Engage with inspiring public art events showcasing creative climate responses.
• Regional Pavilions: Explore insights from Oceania, Europe, Africa, and Latin America.
• Workshops: Connect at early-career networking events, plus sessions on managed retreats, Pacific responses, and more, hosted by leading New Zealand universities.

Arrive early for pre-conference events on 12 October or stay for post-conference workshops.

Limited grants are available for students, LDC participants, and Indigenous scholars to ensure broad participation.

Save the date and join us!

Visit https://adaptationfutures2025.com for more details, including registration, schedules, and participation options.

We look forward to seeing you in Christchurch—or online—as we collaborate to shape a resilient future.

 

Key Learning Objectives/Outcomes

Familiarity with key principles in fluvial geomorphology and their application to various river management situations (e.g., catchment (and regional) planning, sediment flux issues, and relation to flood hazards). Build familiarity with key principles in fluvial geomorphology and their application to various river management situations 

When

Monday 20 October - Tuesday 21 October 2025 TBC

Where

Wellington and Waikanae

Time

Two full days (8am-5pm)

Exact times to be confirmed

Cost

$950.00 plus GST for 2-day course. Council rate – $800.00 plus GST

Where to register

Email Rachael Armstrong - Rachael.Armstrong@hbrc.govt.nz

Key themes

Management issues for which geomorphic insight is fundamental:

• Work with the river (nature-based solutions) – respect diversity, work with process
• Determine what is realistically achievable
• Be proactive, precautionary, pre-emptive – tackle threatening processes
• Risk management
• Integrated Catchment Management
• Active and passive practices (including the do-nothing option) – hard versus soft engineering practices … Role of maintenance (weed management)
• Flood management/protection versus ‘living with a living river’
• Managing river erosion
• Using sediment budgets to manage sedimentation issues (including sand/gravel extraction)

Spatial Dimensions of geomorphologically-informed river management

Catchment

• Fundamental geomorphic unit
• Longitudinal profile – source, transfer accumulation zones
• Network relationships (tributary-trunk stream pattern, flux)
• Connectivity relationships

Channel planform: Braided, wandering gravel-bed, active meandering passive meandering, discontinuous watercourse (wetland/swamp)

Channel geometry

• Downstream and at-a-station hydraulic geometry
• Size and shape

Geomorphic units

• Erosional and depositional forms (and process relations)
• Channel (instream) and floodplain
• Assemblages – and approach to analysis of morphodynamics, condition, recovery (Fryirs & Brierley, 2021)

Bed material size

• Bedrock, Boulder/cobble, gravel-bed, sand-bed, fine-grained
• Bedload, mixed load, suspended load

Temporal dimensions of geomorphologically-informed river management

Timescale: Geologic, geomorphic, engineering

Magnitude-frequency relations

Equilibrium versus non-linear relations

Legacy effect (landscape memory)

Processes of geomorphic river adjustment

• Balance of impelling and resisting forces
• Stream power, shear stress
• Resistance elements – role of riparian vegetation, wood, ecosystem engineers
• Entrainment, transport, deposition (Hjulstrom curve)
• Sediment transport – Bedload, suspended load, solution load
• Aggradation/degradation regime – Lane Balance

Evolutionary trajectory of rivers (and recovery potential)

• Relating character and behaviour (capacity for adjustment/range of variability) to evolutionary trajectory
• Scoping (modelling) prospective river futures to determine what is realistically achievable in management

Geomorphology and river health (condition)

What do we measure where, how and why?

What do we measure against?

Geomorphic relations to Māori conceptualisations of rivers

A living river ethos, mauri, mana, ora

How geomorphology can support river management (indicative only – set up follow up specialist courses)

Scoping river futures - Proactive and precautionary approaches to Visioning & Catchment Planning

Concern for treatment response

Geoethical considerations – concerns for social and environmental justice

• Risk management
• Integrated Catchment Management
• Active and passive practices (including the do-nothing option) – hard versus soft engineering practices … Role of maintenance (weed management)
• Flood management/protection versus ‘living with a living river’
• Managing river erosion
• Using sediment budgets to manage sedimentation issues (including sand/gravel extraction)

Presenters: Ian Fuller, Gary Brierley, Jon Tunnicliffe

Level One Asset Management Course

This course provides a contextual overview of the core elements of Asset Management (AM). Using case studies across different industries we will explore the benefits of Asset Management, required practices, lifecycle management, risk management and how to move forward on the AM journey. At the conclusion of this introductory course, participants will have a clear understanding of the key elements of AM and how to compile an asset management plan that aligns with organisational outcomes.

Syllabus

• Introductions and Course Overview
• Asset Management Overview
• Asset Management – The Organisational Context
• What is the State of my Assets?
• Valuing Assets and Understanding lifecycle implications
• Levels of Service – Do my assets deliver what is needed?
• Risk Management
• Lifecycle Management
• The Asset Management Plan
• Continuous Improvement
• Managing the AM Journey
• Summary

Presenter: Catherine Bayly 

Catherine is an experienced Infrastructure and Asset Manager. She has worked with and for local government organisations for over 20 years in NZ, Australia and the UK. Example work includes physical delivery of capital projects up to $300m, management of city assets, auditing AM competency of international water and river management schemes and most recently the design and completion of a national asset management system for the NZ Water Industry. Cath has co-developed competency based asset management courses in Australia which have been delivered to large scale asset owners including BHP Billiton, the defence force and the water industry. Cath has competencies in all elements of asset management and is particularly passionate about continuous improvement to efficiently deliver community services

When

27 March 2025

Where

Auckland

Time

9.00 am to 5.00 pm

Cost

$900.00 plus GST.

Council rate – $700.00 plus GST

Where to register

Email Rachael Armstrong - Rachael.Armstrong@hbrc.govt.nz

A one-day workshop on practical examples of river management practices, and the context in which options are considered. Participants to bring case studies of recent works or current sites where works are proposed.  The workshop will be discussion based, with a short overview of the wider context of river management. 

 A look at practical examples of river management practices

Who would benefit?

Local authority engineers and asset managers, consultants and contractors actively involved in river management, or who have a specific interest in and experience of rivers and their management.

When

TBC

Where

Wellington

Time

One day (9am-5pm)

9.00-10.30 

Morning Tea

10.45-12.15

Lunch

1.15-2.45

Afternoon Tea

3.00-5.00

Cost

$500.00 plus GST.

Council rate – $400.00 plus GST

Where to register

To register interest email Rachael Armstrong - Rachael.Armstrong@hbrc.govt.nz

Key themes

• River management options: relating to river type and reach character.
• Site context and pre-flood conditions: of flood history, channel changes and sediment transport activity.
• Option selection: from potential bank protection and channel management measures.
• Relating works to site: dimensioning structural bank works, scoping channel measures and margin vegetation management.
• Learning from mistakes: all river management measures are temporary, thus monitoring and observation skills to learn from the river is essential.
• Information techniques of drone imagery and comparing historical imagery (examples of this) and what this tells us about channel form and the rates of channel change, plus measuring bed material size.

Outcomes

A better understanding of river dynamics and the requirements of river engineering, and of different practices used on different types of rivers and around the country.

Presenter Gary Williams and Tony Dunlop. 

Floods cause devastating losses worldwide, yet traditional early warning systems often rely on fixed hazard thresholds rather than real-world consequences. Impact-Based Warnings (IBWs) aim to bridge this gap by incorporating exposure and vulnerability, promising more targeted and actionable alerts. However, their effectiveness remains insufficiently validated. This seminar will present findings from IBW validation in France, where comparisons with hazard-based warnings (HBWs) revealed that IBWs significantly reduced false alarms - especially at finer spatial scales. These results are based on a validation framework using insurance records, emergency response data, and official disaster declarations. Looking ahead, we will explore ongoing efforts to assess IBWs in New Zealand, leveraging flood forecasting methods developed by NIWA and locally collected impact data.  

Presenter: Juliette Godet is a third-year PhD student at Université Gustave Eiffel and INRAE in France. Her research focuses on flash flood early warning systems, particularly their implementation and validation.

To register https://zoom.us/webinar/register/WN_4oBn2JgETES1iXgULXvo3Q

“Nature-based Solutions” (NbS) is the terminology-of-the-day that promotes looking toward nature to address wide-ranging issues. In New Zealand, NbS are frequently promoted with implicit, but unclear, linkages to river resilience. Despite increased interest in NbS, and general agreement that greater river resilience is necessary, there is considerable confusion about what outcomes look like and how they perform through time.

Current NbS capability and capacity in NZ sits within 1) an emerging body of catchment-scale modelers and academics (high-level) and 2) an existing body of lentic wetland builders and riparian planters (hands-on). Present application of NbS in NZ emphasizes actions, which may or may not address the appropriate processes to drive truly resilient solutions. The knowledge gap between high-level and hands-on work presents opportunity, but also massive risks as people attempt NbS implementation in higher energy settings like river and stream channels.

This presentation aims to accelerate New Zealand’s NbS learning by raising awareness of learning resources and avoiding pitfalls of nature-based applications to rivers. It addresses the operational gap between high-level and hands-on groups by providing a practical foundation that:

• • Identifies risks
  • Discusses key NbS design principles
  • Differentiates nature-based actions from nature-based solutions
  • Visualises outcomes
  • Aids expectation setting

Catchment- and scheme-scale applications will be discussed, with examples focused on in-channel, bank, and floodplain work at “site” and “reach” scales, where actions typically occur.

Presenter:

Will Conley, PhD – Technical Principal (River and Catchment Dynamics), WSP New Zealand

Will is an expert in multi-disciplinary, nature-based approaches to sustainable river management. Grounded in process geomorphology, his 30 years of design and assessment experience is interwoven across time as a catchment manager, Director of an international rivers organisation, academic researcher, and international consultancy. His work has provided lasting solutions for flood and erosion hazards, transport resiliency, fish passage, and ecological enhancement and garnered recognition at state, regional, and national levels. Will’s solutions for transport, energy, mining, ecology, and public safety issues have involved diverse collaborations across indigenous, non-profit, academic, commercial, and government groups. Many thousands of kilometres of river exploration across four continents complements Will’s technical work to ensure that results are practical.

To register https://zoom.us/webinar/register/WN__Nkcl1mISuGuHm33S-Y7LA

The impacts of flooding on East Coast State Highway infrastructure and Lifelines

In this webinar you will hear from 2 presenters Richard Bayley and Lillian Ward on the with a longer time of 90 minutes to allow time for questions.

Weathering the Storm: The impacts of flooding on East Coast State Highway infrastructure

Flooding during Cyclones Hale and Gabrielle caused extensive damage and multiple closures across the East Coast State Highway Network. The damage to infrastructure, such as washed-out bridges and eroded roads, has necessitated substantial repair efforts. To respond to the recovery challenge NZTA assembled a construction alliance to undertake this work and help plan for what comes next. Richard Bayley

Lifelines

This presentation is above connectivity from a whanau and hapu perspective. We will delve into the challenges we face within Ngāti Porou from a whanau and hapu perspectives. Lillian Ward

Please share this webinar with your networks this is the link to register. https://zoom.us/webinar/register/WN_Bzpv0_tbRRyQqxP_UKrPfA

Cyclone Gabrielle which struck the Gisborne/Tairawhiti and other regions, resulted in many houses, commercial dwellings and marae were either flooded or impacted by landslides. Immediate rapid building assessments were undertaken to assess property damage which then feed through to subsequent more detailed assessments and finally evaluation under the FOSAL process. Many lessons have been learnt as we worked through the process. Those lessons as well as those from Hawkes Bay and Auckland can help inform how New Zealand deals with the next Cyclone Gabrielle.

Presenter: Dr Murray Cave. 

To register https://zoom.us/webinar/register/WN_e6tiRI5BRziC3KDbj8S-PQ

 

In essence the webinar would look to provide an overview of the Rangitikei (which has a number of unique characteristics) and how the management of the lower reach has evolved over time driven by a combination of some painful lessons, a better understanding of natural processes and a larger data set/ technological improvements to aid analysis. The paper focuses on a specific management issue downstream of the State Highway 1 bridge near Bulls highlighted with the June 2015 floods - the catalyst for the 2020 Climate Resilience Project.

Presenter Ramon Strong

Ramon is employed by Royal Haskoning as Technical Director Water based in Southland/ Murihiku. He’s a river engineer with over thirty years’ experience in the field of civil engineering, a career that started in the dirt, working for Beca as a geotechnical technician out of high school. He attended both the Central Institute of Technology (NZCE) and Canterbury University (BE) and then worked in the field of geotechnical engineer before being drawn to river engineering.

He has 20 years’ experience in regional sector leadership roles mainly with Otago and Manawatu-Whanganui (Horizons) and has extensive experience in river engineering, land drainage, flood modelling, stopbank and dam engineering, and geotechnical engineering. He’s a Chartered Professional Engineer and currently part of the NZ Society on Large Dams management committee.

His key mentors have been the late Dick Hince, CIT hydraulics lecturer, and Colin Hickling, a stalwart of the Wellington civil engineering scene for many years, Wellington Principal for Connell Wagner [Aurecon] and now retired. Colin’s gruff exterior concealed a highly analytical mind, attention to detail and a genuine desire to ensure clients were provided with good advice – ‘old school’. If Colin started a sentence with “Tell me this…” you knew you were in strife.

Like many river engineers Ramon has an affinity for the natural environment, absorbing in part his parent’s passion for native plants, and is an avid tramper/ hiker. He’s enamoured with Southland/ Murihiku from University summer holiday employment in Invercargill and the natural wonder that is Fiordland, and when time and weather permit can be found paddling around Lake Manapouri.

To register https://zoom.us/webinar/register/WN_GoyUflRfRYm7z90T2eXfRQ

 

In February 2023 the east coast of Te Ika-a-Māui/ the North Island of Aotearoa New Zealand was severely impacted by ex-Tropical Cyclone Gabrielle (ETC Gabrielle), leaving a trail of destruction and 9 fatalities. The east coast has a relatively high level of exposure to the impacts of decaying ex-tropical cyclones that move south out of Melanesia/ western Polynesia, often tracking across Hawke’s Bay. ETC Gabrielle was particularly intense with sea surface temperatures in the Tasman Sea playing a part in maintaining that intensity. It’s speed and track brought unprecedented wind, rain and waves/ storm surge - some rain gauges recorded in excess of 500mm in 24 hours and peak intensities in excess of 50mm/hour. Accordingly the damage associated with this event was catastrophic for parts of Hawke’s Bay, in some places shifting residential buildings off their foundations and in other places completely burying houses in silt.

In the weeks following that event central Government instructed local councils to categorise the risk of continued occupation of impacted residential properties, with the highest risk subject to a voluntary Crown ‘buy-out’. PDP was engaged by HBRC to assist with that categorization and in particular that highest risk Category 3 delineation, based on the broad ‘risk to life’ consideration that were so dramatically highlighted with the event – the depth of flooding, velocity, rate of rise, entrained silt and debris volumes. It also included a range of other considerations – geographic features that concentrate the hazard, the availability of safe egress and the complexity of the hazard. The work culminated with the identification of close to 300 Category 3 residential properties subject to voluntary buy-out and the confirmation of around $200M in funding (excluding insurance payouts). The presentation will provide a summary of that work and highlight some of the challenges associated with it.

Ramon is a river engineer with over thirty years’ experience in the field of civil engineering and has just short of 20 years’ experience in regional sector leadership roles mainly with Otago and Manawatu-Whanganui (Horizons). He’s a Chartered Professional Engineer and current part of the NZ Society on Large Dams management committee.