This paper explores the difficulties experienced, methods used to overcome them and the importance of an integrated approach between different sectors within the Utilities team at Council to achieve our Levels of Service (LOS). The requirement of a cohesive team is becoming more apparent to achieve the LOS as the economic climate becomes tighter and we are required to push our assets to the limit and clearly justify all capital expenditure.
This paper will demonstrate some of the ‘trials and tribulations’ that can be experienced when modelling small urban water reticulations. Important aspects of a water supply model build include collection of data pertaining to the network, identification of the reticulation operational regime, collection of data for use in calibrating the model and calibration of the model itself.
The strategic framework is a generic process to guide and record model development for three water (water, stormwater and wastewater) models for the region. The process is deliberately non-prescriptive and high level to enable framework documents to be prepared by others. The framework is to provide models that are “fit for purpose” or “appropriate for their intended use”, support model development, and provide standardisation across Councils to promote efficiencies. The development of model stocktakes, software platforms, model objectives, specifications, management plans, and implementation plans forms part of the process.
This paper has its origins in some internal work we have been doing, giving thought to the place of stormwater management in our business. It will focus in particular on the management of urban stormwater discharges. It presents some of the ideas we have developed about the evolution of urban stormwater management in New Zealand from the perspective of over 25 years of personal practise in the area.
This paper discusses the process and development of a catchpit insert specifically designed to focus on gross pollutants. The other focus of the design was to make a stormwater litter trap that could easily be hand maintained and is affordable; therefore promoting greater uptake by the public.
Opus International Consultants Ltd. was engaged by the Christchurch City Council to investigate their stormwater network in the Port Hills. This investigation was driven by Council to both determine the network condition and prioritise the repair of damage anticipated from the series of earthquakes in Canterbury from September 2010 – June 2011.
This paper will present our approach to optimise renewal strategy:
This paper outlines the approach adopted and presents the fiscal and operational benefits of adopting a rigorous approach to renewals forecasting.
This paper outlines the actions taken by Auckland Council’s Stormwater Operations Group to improve the operation and maintenance of these stormwater ponds. The paper focuses on:
Critical issues in relation to pond operation and maintenance
This paper also provides recommendations for further improvements in relation to the operation and maintenance of Auckland Council’s stormwater management ponds and wetlands.
This presents a method, procedure, and criteria to develop a single information repository for Pond and Wetland asset maintenance and to achieve operational optimisation in the wider Auckland Region.
Auckland Transport Code of Practice (ATCOP) aims to align design process with issues and outcomes for SW management in Auckland. The Plans, Codes and Guidelines proposed for Auckland are described.
This paper presents the advantages of this process and lessons learnt around developing the single Code of Practice. It also provides further detail on key issues within the document, and how they were addressed in the context of a developing planning framework.
This presentation will focus on the implementation of stormwater source controls as part of the redevelopment of urban streetscapes. The author will focus of constructed examples of stormwater source controls drawn from 20 years of experience in the Pacific Northwest. The presentation will highlight evolving design criteria for various streetscape elements and describe how these have affected the implementation of stormwater source controls.
New Zealand Territorial Authorities (TA’s) infrastructure design standards adopt different designs for catchpit inlets, all based on the same well known flow concept of kerb back entry (kerb opening), channel grates or a combination of both.
Constructed wetlands play a vital role in Australia to reduce the environmental impacts of urbanisation. They also provide habitats for wildlife, provide people with places for recreation, and help make people be more aware of the environment around them.
Stormwater infiltration basins form a key part of the suite of low impact urban design devices to treat and dispose of urban stormwater runoff. These basins may suffer a reduction in performance with time, either as a result of improper construction or some step change, such as effects relating to an earthquake. In this paper several methods and tools available for remediation of stormwater infiltration basins that exhibit reduced performance are discussed, with reference to relevant case studies in the Christchurch area.
The focus of this paper is the design and construction of the bio-retention devices (rain gardens and tree pits) to manage the stormwater runoff from the roads being built in the first stages of construction in the SP-B area.
Rivers and Lakes, DThis paper will present the work carried out for the Whakatane River salinity intrusion forecasting and demonstrate that it is possible to exploit existing investments in river models to make predictions of important water quality events.rinking Water, Saline Intrusion, MIKE 11 XZ Forecast
It is common knowledge that intervention is necessary to mitigate the ongoing effects of urban contamination on our waterways.
Intervention is usually achieved via discharge consents, granted only if appropriate management practices are implemented to avoid, remedy or mitigate effects on the receiving environment. However, insufficient data exists to determine whether the proposed controls and limits are achieving environmental outcomes. In particular, not enough is known about specific receiving environments, which makes setting discharge limits ‘guesswork’.
This paper presents a synopsis of the interpretation and implementation of the BPO framework, and attempts to provide a clearer understanding and greater consistency in the implementation of BPO criteria, specifically in the context of stormwater management in the Auckland region.
The paper explains the process and gives examples of how to meet these stream health controls and indicative costs. This new approach is building on similar approaches in recent plan changes in the Auckland Region that have gone through very extensive technical work and legal challenges and are now operative.
The Buckle Street underpass is part of the Memorial Park project being delivered by the Memorial Park Alliance. Investigations of stormwater systems for the proposed Buckle Street underpass indicated that overland flows posed a flood risk to the underpass. Star CCM+ Computational Fluid Dynamics (CFD) software was used to model the stormwater flow through the intersection. The flow of water entering and bypassing the underpass was quantified.