Stormwater design like any other engineering design requires that the rules and standards of various local authorities are followed. Specifically stormwater design pipe sizing, spacing and material choices are dictated by standards for a good reason.
This paper will present hydraulic design considerations, beyond the standard guidance information, for stormwater treatment devices and discuss implications on the stormwater network.
A significant challenge facing the Auckland Unitary Plan (UP) is to provide for significant urban growth in Auckland while at the same time addressing widespread existing issues including flooding, degraded water quality and ecosystem health, and loss and modification of streams.
The paper also lists service conditions which allow designers to specify standard manhole components for safe bearing capacity, traffic loads and depth of installation.
The paper discusses the implications of the National Policy Statement for Freshwater Management 2014 (NPS-FM) for managers of stormwater assets.
This paper reviews the approaches taken by the UK in key strategic technical areas in the last decade and provides observations from the perspective of a flood risk management professional working in both the UK and New Zealand.
Continued urbanization and the effects of climate change have led to flooding events becoming the most common natural hazard experienced around the world. With greater numbers of people living in cities than ever before, the vulnerability of urban areas to flooding needs to be addressed.
In this paper variation of model uncertainty is compared to freeboard offsets that are commonly applied across New Zealand.
The purpose of this paper is to compare two separate significant rain events experienced in South Taranaki in the winter of 2015; each resulting in devastating but quite different impacts; and so demonstrating the resilience of the communities most affected through the different responses. In both events, and since, South Taranaki District Council continues to play a central role in assisting with the response and recovery for those communities.
The paper also compares before and after changes in infiltration rates from cleaning. This new, innovative method for cleaning pervious pavement can be applied at scales from a single driveway to large parking areas.
This paper describes a GIS-based road stormwater screening (RSS) model designed to assist road controlling authorities and network operators manage stormwater runoff and develop supporting catchment and asset management plans.
Where the piped stormwater network joins with the open channel network can often be a point at which numerous issues arise, particularly during flood events. At the upstream end of the system there can be large natural catchments which bring down large volumes of water and debris (gravel and vegetation) which result in blockage of intakes.
The objective of this paper is to summarise legislative drivers that are often applied to flood risk, demonstrate the potential effect of flow attenuation on the wider catchment, and to emphasise key factors for assessment when looking at effective stormwater management of the flood risk.
his paper describes the steps which were taken to deliver the first three year (2012-2015) of the long term plan. These steps included appropriate ‘Best for Waipa’ resourcing using a blend of in house and consultant resources, the establishment of processes for managing programme and project risk and the procurement of project management services, consultant and contractors. As part of this process tools were developed to track and encourage innovation, to ensure that appropriate review and escalation methods were available and that monthly cash flow spend was appropriately monitored.
This paper describes Waikato District Council’s journey in creating the 2015 Infrastructure Strategy, including successes and lessons learned. It also recommends actions for improving the next Infrastructure Strategy in 2018.
his paper will describe the voyage of discovery - the highs (the excitement of drill rig operators) and the lows (silt, silt and eggy smelling water). It will describe modelling outcomes and present the various solutions now being considered for a number of unique situations in the QLDC area
Water suppliers in New Zealand need to consider the consequences of the effects of climate and demographic change. The first of these drivers is expected to cause water availability problems and the second an increased demand for water.
This paper outlines the extent of the work packages delivered and discusses the strategies employed to ensure that the final solution was implemented with a seamless transition for the customers.
This paper outlines an applied approach to sewer network management that includes innovative modelling and analysis tools resulting from specific applied research into the mechanisms of corrosion and odour generation in sewers.
This paper focuses on the development of the masterplan, the results of the wastewater model and development of the Programme of Works and outcomes. It serves as a case study on the benefits of the adopted roadmap and future implications.
This paper provides two case studies of GRP pump stations in sewer networks within Marlborough. In one, a GRP pump station has replaced an existing concrete pump station conveying corrosive winery wastewater.
The paper will discuss the cradle to grave asset management philosophy as applied by Waipa with regard to the Karapiro reservoirs and how an understanding of asset criticality and condition can lead to enhanced plant understanding, performance and risk mitigation.
This paper presents conclusions and recommendations from lessons learned during these events.
The re-build of the damaged water and wastewater networks in Christchurch following the 2010/11 Canterbury earthquake series has almost exclusively been undertaken with modern Poly-vinyl Chloride (PVC) and Polyethylene pipe materials.
This paper outlines the options, constraints and considerations that were worked through to decide a final scheme configuration and how the project team and CCC worked with stakeholders and residents to overcome the challenges that arose during construction and commissioning.
