The new Westgate town centre, currently under construction on greenfield land, was masterplanned with the urban design integrated closely with the green infrastructure of a dynamic 22ha open space network, Kopupaka Park. The landscape architects saw the opportunity to add significant value to the proposed stormwater system through a design-led approach that integrates community amenities with engineering and ecological outcomes. The masterplan envisioned a hybrid park typology, a uniquely New Zealand design integrating environmental infrastructure, reinterpreting horticultural practices and respecting Maori cultural values.
This paper provides an overview of the project wide stormwater management philosophy with specific focus on the Rangiriri Wetland design, and how an integrated solution was developed. Commentary on the design will highlight how the form and function of the wetland was developed based on the site specific constraints.
This paper will trace the evolution of stormwater management in Auckland; will show how strategic planning has been part of this process for the last 30 years, and how water sensitive design is the natural progression for stormwater management in Auckland and others of the World’s most liveable cities.
The establishment of flow gauging and monitoring sites in a stormwater network often requires the installation of new assets, for example, Parshall flumes, weirs, or calibrated culverts. In the majority of cases, this requires a capital budget for the installation of the structure, and results in a new potential obstruction to flow and a new asset that requires cleaning and maintenance.
The first study applied either a constant flow of sediment-laden stormwater or a single runoff event, to various pond designs. This was to determine the effect of various parameter on pond efficiency (expressed as the fraction of incoming suspended sediment that is trapped). The variables investigated included pond size and geometry, inlet geometry, and baffles that redirect flow.
In this paper the above process is described. Further, this paper explores the issues surrounding the political environment of delivering stormwater improvement works and setting levels of service along with consideration of the options available to Councils to create community resilience to the current situation. The focus is a Tauranga example and is based upon the learnings that the Tauranga City Council has made to these strategic issues over the past year.
This paper explores the flooding issues in the district, the challenges faced, and the process worked through by the Flood Team. It also describes some of the solutions adopted, both physical works and changes to Council systems and processes, maintenance practices, and funding.
In this paper we will present the problems we are facing in the Bay of Plenty, with regards to the long term sustainability of our River Schemes, and the strategy of addressing them.
On Auckland's North Shore approximately 70% of the area’s streams run through privately owned land; the burden of this urban stormwater system falls on the private landowner. Is this understood? What gets the landowner involved in acknowledging the stream through their property and caring for this system as a key link in the urban stormwater network?
Stormwater360, in collaboration with Callaghan Innovation, has undertaken a laboratory study to investigate innovative engineered soils for use with a flow controlled biofiltration /retention system.
The aim of this study was to review the potential of source control measures to reduce stormwater pollution and lower stormwater runoff in a high-density area by drawing from peer-reviewed articles on the various practices. An overview of source control techniques and key research findings highlighted the potential of green roofs, bioretention devices, permeable pavements, swales, detention ponds, and constructed wetlands. Finally, the results of their potential were synthesized and parallels were drawnwith areas in Bangkok where environmental quality improvement might be promoted.
This presentation provides case studies about the public art sound installations Kumutoto Stream and The Wet Index as examples of how art can provide a platform for increasing community understanding and appreciation of urban water issues.
The paper and presentation will be a case study of the Pakenham project from a low-impact development perspective. The technical problems overcome via flood modelling will be addressed.
This paper outlines the key issues faced by the ageing pumpstations built through 1960’s to 1990’s to provide flood protection and drainage services in the Lower Waikato, Waihou Valley and Piako River catchments.
This paper addresses the conference topic of interest “Sustaining and valuing the environment”. In the course of our research we have encountered comments from stormwater professionals around the theme “It would be good to be able to value the difference that stormwater management makes to the condition of receiving water bodies”. We discuss a new approach that contributes to the indicator suite of the stormwater decision support tool “Urban Planning that Sustains Waterbodies” (UPSW).
The Burnett River, QLD Australia, experienced severe flooding in early 2011 and 2013, with the latter flood breaking all historical records. As a result, damage to infrastructure in Bundaberg and the loss of agricultural land from bank erosion was considerable. Exacerbated by the floods is concern about reducing sediment delivered to the Great Barrier Reef (GBR). It was determined that about 28M m3 of material was eroded from the banks of the Burnett River making it the single largest contributor of sediment (as opposed to a minor contributor as was earlier reported) and causing re-evaluation of sediment management strategies.
This paper discusses: types, sources and loads of sediment and key physical and chemical contaminants in stormwater; and receiving environment status, impacts and recreational grading.
This paper presents the sampling methodology carried out, results obtained, and discusses the various chemical transformations that can occur as the product migrates through a stormwater network. The paper also discusses how Z and BP selected truck stops for DEF installation, and also the limited stormwater management options available in the current market to deal with the potential stormwater effects of this product.
This paper articulates the institutional processes, community understanding, technical guidance and functional delivery mechanisms required to support transition to water sensitivity.