This paper will outline Rotorua District Council’s experience related to the construction, commissioning and start up operation of the LPGP system installed; in particular dealing with the householders during construction phase.
This paper discusses the comparisons of cost and the factors that impact on a project, the environment and society that should be considered when selecting the appropriate pipeline construction methodology.
Integrated catchment management (ICM) is a holistic approach to managing natural resources within a defined geographical catchment area. The management effort in catchments is often fragmented, lacking cohesion and focus and sometimes at odds with each other.
Horizons is responsible for all aspects of water, air and soil management in the Manawatu-Wanganui region. We have sought to improve knowledge of relative contributions of freshwater contamination from various sources.
Aquatic microbiological surveys in streams draining intensively farmed catchments can, during flood events, indicate differential time-concentration patterns between a bacterial health-risk indicator (E. coli) and a major zoonotic bacterial pathogen that it seeks to indicate—Campylobacter.
How do you make a robust management decision on a preferred site for a new water supply dam when the three short listed locations each have different advantages, disadvantages, issues and costs?
This paper presents the methodology, outcomes and the resulting work which sought to link water quality issues with their causes, and to then identify mitigation and improvement solutions.
The Markov process is a mathematical model used to recreate stochastic systems which have the property of being “memory-less”. That is; those systems for which the probability of being in any future state is dependent solely on the current state and not the past.
This paper introduces the basic principles of pipeline renewal and focuses on two of the key factors that are at the foundation of any renewal programme; data collection and condition assessment. Understanding and effectively implementing these two steps will greatly assist the efficient and sustainable planning of pipeline renewals.
In the water and wastewater industries, historic best engineering practice for quantification or characterisation of water or wastewaters involved grab-sampling campaigns.
Following the recent Rosedale Wastewater Treatment Plant Stage 5 upgrade and the associated construction of two additional primary sedimentation tanks there have been some noticeable improvements in operational efficiencies and process stability.
Construction of the demonstration Granular Activated Sludge treatment plant at the Rotorua WWTP site went smoothly. Initial teething problems have coincidentally all been related to air supply.
Stormwater ingress and infiltration (I&I) into the wastewater reticulation in Te Aroha is high, with the hydraulic capacity of the membrane bioreactor (MBR) being inadequate to treat wet weather flows (WWF).
HDD (Horizontal Directional Drilling) Technology originated in the oil fields of the western United States in the 1970’s. HDD technology was developed by merging the installation know-how of a water utility with that of a water well drilling company.
This paper looks at the impact of CSOs and SSOs on the receiving environment, and discusses the most effective methods for assessing their impact, and significance, prioritising the worst offenders and then designing effective management and improvement programmes.
In many hydrological modelling applications it is considered advantageous to measure, in real time, the state of catchments and make predictions about future outflows. Precipitation data is typically fed into hydrological models from sparse gauge networks, or from just a single gauge.
This paper comments on the challenges in preparing the Consultants’ Brief for Project Storm 2. It also provides discussion on the lessons learnt through the process, and ideas that may be useful for the planning and preparation of modelling briefs by client organisations in the future.
This paper describes an over-arching process that pulls together the key and forgotten elements of a modelling project to ensure they never go over time or over budget. The process is generic in principle and collaborative in nature so that client needs and modeller delivery matches precisely. Surprises during a project that can usually compromise the final outcome are avoided.
This paper will outline the evaluation process that the Rotorua District Council undertook in choosing the preferred pipe material for the application which involved both desktop studies and field trials. It will also present the difficulties encountered in undertaking the pipeline replacement work in a very active geothermal area.
This paper will provide a brief review of the AWG Performance Report to highlight the critical performance measures that are essential for effective utility management.
The paper covers the exploration of areas in a wastewater network infrastructure project where innovation can be applied, from feasibility through to construction, and explores how the innovation tools used vary from stage to stage, and within each stage.