Conference Papers

Rain Radar Nowcasting of High Intensity Rain Events in Auckland and Wellington

02/05/2019

It can be a challenge to manage the complex flooding risks in urban areas. With New Zealand’s topography and climate, many densely developed and vulnerable communities are often located in small, steep flood prone catchments.

Identification, Prioritization, and Mitigation – a Three Step Process for Stormwater Quality Management

02/05/2019

Development of effective plans for stormwater quality management to mitigate the degradation of freshwater quality in urban catchments demands an explicit understanding of the catchment both spatially and temporally.

Back to Takanini – Pipes? Where we’re going, we don’t need pipes

02/05/2019

This paper discusses the design process, the implementation and lessons learned as well as customer feedback from key stakeholders including the developer and Auckland Council, who will ultimately be the asset owners of these WSUD features within the development.

Enabling Factors for Transitioning to Improved Urban WaterOutcomes; Winston Churchill Fellowship Findings

02/05/2019

At a time of increasing national focus on urban water quality, Stu Farrant from Morphum Environmental was awarded a 2018 Winston Churchill fellowship to undertake international travel and research to better understand the enabling factors which have supported globally leading cities in addressing the complex issues of urban water management.

Reflecting Mātauranga Māori in WaterSensitive Urban Design

02/05/2019

This paper explores what WSUD means to Māori and how WSUD in Aotearoa currently recognises and provides for Māori values.

Modelling Long-Term Volume Retention In A Bioretention Device

02/05/2019

Streams in Auckland Region have been found to exhibit loss of natural functioning of freshwater systems and the degradation of their values as a consequence of intensive urban development. Conventional development, unless mitigated, significantly increases runoff volumes and the duration and frequency of elevated peak flows which consequently degrade the morphological and ecological functions of freshwater systems.

A SystemicToolforaMulti-value Stormwater Management System

02/05/2019

This paper outlines the modelling approach selected and how the diverse functionality of the stormwater system designed was achieved through the aid of modelling tools.

Addington Brook – A Catchment Approach to Improving the Health of an Urban Waterway

02/05/2019

This paper shares the journey of proactively enhancing one such urban stream in Christchurch, namely Addington Brook, a priority focus for Christchurch due to its degraded water quality.

The Effect of Inlet Width on the Performance of Retention Ponds in Thermally Induced Flows

02/05/2019

The effects of inlet and outlet configurations in sediment retention ponds (SRPs) have been widely investigated by a number of researchers; however, the challenges associated with the proper inlet and outlet design still exist when considering temperature differentials in the ponds.

Temporal Rainfall – A Risk-Based Approach

02/05/2019

This paper builds on that earlier work (McConchie & Belleville 2010) which noted “The temporal pattern of the design rainfall needs to be accommodated within any rainfall-runoff model if it is to produce realistic hydrological outputs…the actual temporal distribution of storm rainfall at any specific location may be distinctly different to the generalized distribution. This will result in unique storm runoff which must be related to that of the design event.

Unintended Consequences: Stormwater to Ground vs Groundwater Drinking Supply Protection

02/05/2019

This paper will provide an insight of the current and increasingly prevalent issues arising in Canterbury from stormwater infiltration facility use.

Case Study: Sleemans Slip. A Grass Spillway Solution, using the Five Fundamentals of Successful Rehabilitation

02/05/2019

In June 2017, a one in 50-year storm event caused 1000m3 of material to fall into a water canal which is used to irrigate up 60,000ha of the Canterbury Plains. This material had to be removed and a grassed spillway installed to prevent any more erosion and stabilizing the slope during storm events.

Regional Predictive Outputs for the NPS-FM – Auckland’s Freshwater Management Tool

02/05/2019

Adaptive Planning Using a Data-rich, Interactive and Accessible Tools

02/05/2019

The paper will present ways to access (consolidated) information using (for example) ESRI StoryMaps, interactive web-based tools and GIS information resources to support City scale master planning and catchment scale studies.

Bridge Manual Waterway Design: An Update

02/05/2019

The development of design guidance for minor culverts and stormwater systems in the Transport Agency’s Highway Structures Design Guide revealed updated design practices that were also relevant to major culverts and bridges.

Engineering the Life Back into Maketū Estuary

02/05/2019

This paper reports on some of the project challenges and successes during the design and construction phases.

Public Safety at Catchpits – Lessons from Tragedy

02/05/2019

Auckland Council and Auckland Transport are implementing recommendations from the catchpit safety review. Sharing the lessons from this tragic incident is a critical step to help avoid a similar event occurring in the future.

Using Global Lessons to Implement Water Sensitive Design into Local Neighborhoods

01/05/2019

Auckland’s Approach to the Stream Erosion Problem

01/05/2019

This paper outlines the direction Auckland Council is embarking on to proactively identify existing and future stream erosion risk and to gain an improved understanding of baseline sediment and erosion levels across the region.

Dry Weather Discharges from a Monitored Stormwater Catchment

01/05/2019

Stormwater is known to be a major source of contaminants to aquatic environments within urban areas. Research and monitoring over the past two decades has provided a good understanding of the types of contaminants and the concentrations of these from different land uses and land covers, such as roading, roofing and residential areas.

Quantifying the Contribution of Rainfall and Tide Levels on Flooding in Low-lying Coastal Areas

01/05/2019

This paper outlines how to spatially identify coastal areas that are sensitive to extreme tides and rainfall, how to understand what catchments might be susceptible to rising sea levels in the future and what ground elevations will sea levels now and in the future effect pluvial flooding. It can be used to understand the effect of rising sea levels will have on flooding in low-lying coastal areas, better assess development in coastal areas and to minimise numerous joint probability modelling runs.

The Stormwater and Tide Interface in Christchurch

01/05/2019

This paper outlines the methods that have been used in Christchurch to estimate and plan for combined tidal and stormwater flooding risk using analyses of historical data and hydraulic modelling approaches. The results of these analyses have been used to develop planning rules and infrastructure programmes.

Cost-Effective Tools for Urban Water Quality Monitoring

01/05/2019

Culturally Enhanced Stormwater – Interweaving Mātauranga Māori

01/05/2019

How Will Climate Change Affect Our Two Waters?

01/05/2019