Tuesday 13th May
2:30 pm to 3:30 pm
2024 NZ Fish Passage Guideline Update – Engineering Application for Culverts
Facilitated by Eugene Vodjansky – BBO
The New Zealand Fish Passage Guidelines, Version 2.0, includes significant changes to the methodology for fish passable culvert design. This workshop will provide guidance, as well as an opportunity for hands-on application of the new methodologies and interaction with some of the authors of the new NZ Fish Passage Guidelines.
A general overview of the methodology will be presented including fish passage design flows, use of velocity distribution, fish swimming speed/duration, and culvert embedment. Then the workshop presenters will help the participants work through a fish passable culvert design, using HY-8, a culvert design software produced by the US Federal Highway Administration. The design will include achieving fish passable depth-averaged vertical slices within the culvert flow and the appropriate size and depth of embedment material. References for embedment material sizing will be presented. Further discussion on the limitations of using HY-8 and cases where the standard approach may need to be adjusted in steep terrain, coastal areas, higher elevations, and near the top of catchments. Participants are encouraged to bring their laptops with HY-8 downloaded (https://www.fhwa.dot.gov/engineering/hydraulics/software/hy8/HY88.00.2Setup.zip), to allow active participation in the workshop.
4:00 pm to 5:00 pm
Mā te haumaru ō nga puna wai ō Rākaihautū ka ora mo ake tonu: A national hazard and risk model for increasing flood resilience across Aotearoa
Dr Emily Lane – NIWA
We are seeking input from stormwater practitioners that will inform the final design stages of a nationwide flood hazard and risk model and will contribute to cementing this model as a key tool for improving flood resilience for years to come.
The MBIE-funded Mā te haumaru ō nga puna wai ō Rākaihautū ka ora mo ake tonu / Increasing flood resilience across Aotearoa project has entered its last funded year. The research team is now focusing on fine-tuning project outputs that will be useful, useable and used by New Zealanders to increase understanding of flood events and assist in making decisions that improve community resilience to these hazards. The principal outputs of this project are nationwide hazard and risk models that are openly available, nationally consistent, and take into account various climate change scenarios. We are seeking input from a range of stakeholders (likely users of the model) to determine their requirements for the tool.
The workshop consists of two parts. Initially, we will present the research results and demonstrate the major functions of the model. We will then break into groups to investigate applications of this information, future knowledge requirements, and how best to influence good outcomes for Aotearoa. Some questions we will canvass include:
- The model and its user face: What and how often should we update it? Who should own the information and process? Who pays? What is the approach to standardisation we should follow?
- Access and education: How can we support iwi and community members to understand the information and how to use it?
- Priorities for future enhancements and research: Hydrology? Mapping approaches? Risk assessment processes? Social impacts? Exposure datasets and damage curves? Impact assessments on services/lifelines / social and cultural history/ environmental impacts?
- Applying the model: what other uses could the data serve? Can we shift to considering more than economic damages when assessing impacts?
Wednesday 14 May
11:00 am to 12:00 pm
Driving Stormwater Outcomes Through Diversity, Equity and Inclusion – One Year on
Water New Zealand’s Diversity, Equity and Inclusion Group – Deborah Lind
At Stormwater 2024, DEI panellists issued a compelling challenge to the sector: it’s not enough to simply open the doors to diversity; we must ensure that diverse perspectives actively drive better outcomes for stormwater management. One year on a new DEI SIG has been established – what progress has been made towards the challenge set?!
2:00 pm to 3:00 pm
Unlocking Growth: Overcoming Stormwater Barriers To Intensification
Josh Hodson – Tonkin + Taylor
Recent years have seen a significant increase in the rate of population growth in New Zealand’s cities. With recent legislation like the Medium Density Residential Standards (MDRS) and the National Policy Statement on Urban Development (NPS-UD), many tier 1 and tier 2 local authorities are focusing on the provision of new housing within existing urban areas (i.e. intensification).
Intensification is typically associated with the creation of new impervious areas which leads to increases in stormwater runoff from sites. Resolving how to deal with this additional runoff without worsening flood risk is often one of the key roadblocks to allowing intensification to occur. This workshop will give an overview and pros and cons of typical approaches to dealing with additional runoff including source control, onsite mitigation and downstream stormwater network upgrades. Workshop attendees will be tasked with working within groups to develop their own proposed suite of approaches, balancing the pros and cons of each approach, in order to unlock intensification.
