This paper describes how MWH’s design approach led to improved plant performance, energy savings for New Plymouth District Council and provided a successful outcome for Project Wai Taatari.
This paper will describe the different phases of the project, the specific techniques and equipment that were required to carry out the rapid construction (in 4 months) of 23,000 square meters of impervious structure, and will detail the quality management. Storage capacity of this dam is more than 35 million cubic meters, in order to supply potable and irrigation water (BGM has NSF 61 Certificate for potable water).
The paper describes the approach I have adopted on a number of sewer and stormwater projects as a consultant working with a UK water company, the difficult decisions made and the managed outcomes achieved.
The paper describes the ultrasonic principle and the communication method of the water meters. It considers specific requirements for New Zealand and Australia regarding compliances as far as they are different from Europe.
This paper features a case study of the upgrade to the wastewater network, treatment plant and land disposal/reuse systems at Mount Isa to provide optimal financial value and reuse of treated effluent in a region short of water.
The case studies include dairy and starch production wastewater in Australia. All production facilities use the ADI Systems ADI-BVF® reactor to anaerobically treat the wastewater, producing an energy-rich biogas. The biogas is used in plant boilers to generate process heat for the site. The anaerobic effluent is aerobically polished by a sequencing batch reactor or membrane bioreactor to further reduce the pollutants in the water prior to final discharge or reuse.
The process of kilning timber produces condensates which although low in volume, contain high concentrations of organic compounds. If this wastewater is to be discharged to land or waterways, a significant proportion of these components need to be removed. If further removal of organics can be achieved, then the resulting water has considerable value for reuse in on-site kilning and wood treatment processes.
This paper presents the methodology and outcomes of this study, linkages with Auckland’s Most Liveable City goal and provides an insight into the Boards draft 2014-2017 programmes leading to the improved quality of waterways.
Moreland City Council is located in Melbourne, Australia. They are committed to creating an environmentally sustainable and liveable city by supporting and encouraging the implementation of triple–bottom line solutions to improve the local environment and thus contribute to solving global environmental issues. Best practice stormwater treatment is a central tenet of this commitment, which is partially achieved by encouraging the installation of WSUD elements throughout the municipality.
“The Banks”, Whitby demonstrates how large scale land development can provide a positive impact on the surrounding environment through the integration of restoration works. The development of the historic Whitby Golf Course includes approximately 320 residential sections alongside Duck Creek in Porirua City's hill suburb of Whitby. Duck Creek is an important natural resource for the local area and it discharges into the nationally significant Pauatahanui Inlet arm of Porirua Harbour.
Cities that are undergoing rapid urbanization experience increased vulnerability. Communities living in those urban areas are exposed to unprecedented environmental issues and impacts of climate change. These challenges necessitate a resurgence of urban planning methods and applications. Contemporary planning practices need to incorporate the concepts of ‘livable cities/communities’ for delivering cities of the future. Despite well-informed concepts, real solutions seem elusive, particularly in tropical cities. Consequently, environmental changes have been increasing, endangering communities and natural resources through increasing climate change impacts of extreme weather events, floods, and drought.
The paper presents the organisational and technical challenges associated with delivering a project of this scale, concentrating on developing a robust technical approach, with a short project timescale.
This paper summarises the Auckland Council Technical Publication TR2013/043, which compares the life cycle costs of a range of stormwater management devices that can be used to meet controlled activity requirements in the PAUP stormwater management flow and quality rules. This includes the reduction of runoff volumes through retention of small, frequent events in SMAF areas and the treatment of high-contaminant generating areas at source. The flow requirements in particular cannot be met using solely catchment-scale management devices such as wetlands. This, along with policy supporting a Water Sensitive Design (WSD) approach shifts the focus from end-of-pipe treatment to on-site management of stormwater quality and quantity (for flows less than the 2 year ARI).
Auckland Zoological Park uses substantial quantities of water in their daily operation; for visitors and staff sanitary purposes, animal welfare and cleaning, through to irrigation in summer. Up to 2/3 of the demand is for non-potable quality water. The merits of stormwater runoff to meet this demand was evaluated at a desktop level for the period from 2010-2014.
We look at the approaches and solutions that have been applied in the Canterbury environment and how these have fared in recent significant flood events. We also present recent case studies from residential developments and proposed plan changes where a higher level of service than required by the building act was provided and how this will help to reduce the probability of future flood disasters.
This paper summarises how this collaborative approach has provided a streamlined method to over 20 small urgent work projects since its inception in March 2014 and has become a pivotal operational tool for responding to failures, improved customer service, project planning and budget phasing.
The paper discusses the effects of climate change on water quality in the marine receiving environment based on predicted changes in hydrodynamics, precipitation, mixing and the dynamic nature of the interface between the marine environment and the urban stormwater system. From a planning perspective, the need for quantifying the joint probability of extreme rainfall events and sea levels are discussed.
Industry has not always been well informed of the outcome and operational needs of the Auckland motorway stormwater network. This presentation will cover some key maintenance and operational lessons and innovations by the AMA that help contribute towards making Auckland City the most liveable city in the world – some of the AMA learnings will be of relevance and ‘transportable’ to other stormwater networks throughout the Asia-Pacific Region.
This paper presents a summary of the process of taking the vision of stormwater tree pits in central Christchurch to the detailed design phase for the Accessible City project.
The SCS (or NRCS) method, arising in the 1950’s out of analysis of real data from large numbers of catchments across the USA, is one of the most commonly applied flood estimation methods. It is used in several regions within New Zealand and is the preferred method for the Auckland Region. The original approach was empirical and this paper presents a concept of the physical rainfall-runoff processes for the SCS method. It is based on the variable source area concept for promoting runoff.
This paper summarises Dunedin City’s strategy for progress in their planning controls and presents the Upper Taieri Plains model, which was one element of the above work. This model is technically interesting because it uses DHI’s latest flexible mesh and GPU processing technology and contains no 1D elements.
This paper describes the model build of the Christchurch overland model, its sensitivity testing, calibration using the 4 and 5 March 2014 flood event and also its application in assessing IFV. This paper also describes the additional work currently in progress to construct a model to assess IFV for Kaiapoi and adjoining residential areas north of the Waimakariri River.
The aim of this study is to address the issue of rainwater runoff from highways, through quality characterization of runoff and the analysis of its environmental impact. Being linear pollution sources, highways determine a chronic impact on stormwater, due to continuous leaching from atmosphere and pavement surface to receiving water bodies or groundwater.
As stormwater-related regulatory programs have been established various stormwater control measures (SCMs) have been developed to address stormwater runoff and are being applied countrywide. As the number and complexity has grown, the need to develop processes to verify, and/or approve SCMs arose to ensure the performance efficacy of products and practices.