Stream I: Asset Management 


10.1 The future of utility master planning: Why asset management planning must become redundant

10.2 Using predictive modelling to support collection system rehabilitation planning

10.3 Making renewal investments with confidence – A robust decision process for 3 waters reticulation networks

10.4 Risk analysis and the identification of infrastructure renewal needs for the Town of Cochrane

10.5 Pressure pipe design of water and force main plastic piping systems

10.6 AC watermain break probabilities and replacement planning tools – Nanaimo's expereience

10.7 City of Kamloops – Existing 600mm AC Forcemain X,Y and Z mapping project



10.1 The future of utility master planning: Why asset management planning must become redundant

Presented By:
David Main, AECOM.

Time: Tuesday, 8:00 - 8:30 AM

Over the past 50 years, utility master planning has been an accepted best practice for developing a utility wide, long range-resourcing plan. Traditionally, a masterplan will include a well-engineered proposed strategy along with the estimated short, medium, and long-range budgets to support the ability of the community to meet the changing requirements of growth and to ensure regulatory compliance. A good masterplan should include a forecast of both capital and O&M resources that together, will result in a cost effective and economically manner in which to meet approved levels of service. Evidence is showing however, that in the coming decades the need to reinvest in deteriorating infrastructure will place by far the largest capital demands on most of our utilities. Many communities are responding by preparing asset management plans that are at present prepared in a process that is not integrated with utility master planning. There is a risk that as long as asset management and master planning exercises remain separate, utility stakeholders will not have a clear vision about overall required levels of funding and thus it will remain difficult to obtain financially sustainable rates. This presentation will show that the utility masterplan of the future (but is really needed now) must include a fact and evidence driven process to estimate and forecast infrastructure renewal needs in association with capital demands from growth and regulatory compliance. A case study from the Resort Community of Whistler will be used to illustrate the concepts in this presentation.

pdf icon Presentation PDF 


10.2 Using predictive modelling to support collection system rehabilitation planning

Presented By: Mike Homenuke, Kerr Wood Leidal Associates Ltd.
Time: Tuesday, 8:30 - 9:00 AM

The City of Victoria's sanitary sewers and storm drains are approximately 100 years old, and many pipes are in need of rehabilitation. The City of Victoria has recently completed over 500 km of video inspection and condition assessment for its sanitary sewers and storm drains. This provides a current snapshot of the collection system's condition, but it does not provide all of the answers in terms of how to manage inspections and rehabilitation over the long term.

The Sewer Cataloging, Retrieval and Prioritization Systems (SCRAPS) is a model developed by the Water Environment Research Foundation that allows engineers and asset managers to identify pipes in greatest need of inspection, based on a wide range of input variables. SCRAPS uses a probabilistic modelling engine to integrate the various inputs and assess probabilities and consequences of pipe failure due to structural or operational issues. This presentation will describe how to make effective use of condition assessment data processed with the SCRAPS model to optimize planning and financing of collection system rehabilitation plans and funding over the short and long term. Several options for collection system management strategies were evaluated for the City of Victoria and the results will be presented.

pdf icon Presentation PDF


10.3 Making renewal investments with confidence – A robust decision process for 3 waters reticulation networks

Presented By: Phillip McFarlane, Opus International Consultants Ltd.
Time: Tuesday, 9:00 - 9:30 AM

Municipalities across the world are faced with the challenge of managing aging stocks of assets, while coming under increased pressure to reduce expenditure. This is leading to a drive to improve efficiencies and implement advanced asset management.

This paper describes a decision support process that has been developed to help municipalities prepare optimised renewals and maintenance programmes for potable water, wastewater, and stormwater reticulation assets. The software tool produces budget forecasts, future risk profiles, and level of service predictions for various scenarios. It enables water utilities to gain a better understanding of the trade-offs between investment, risk and levels of service.

The tool has been developed by Opus International Consultants Ltd, IDS Ltd, and Deighton Associates Ltd and has been prototype tested with several municipalities in New Zealand.
The decision support tool combines theory of optimised decision-making and mathematical deterioration modelling of pipe decay with solid operational practices. Processes for modelling deterioration of pipes are outlined and the paper discusses how deterioration, risk, and level of services influence the selection and timing of intervention measures. The paper describes the benefits that have arisen, not only from the outputs of the process, but also the learning's during the development phase. Challenges with regard to business processes and data availability and how these have been overcome are also described.

 pdf icon Presentation PDF


10.4 Risk analysis and the identification of infrastructure renewal needs for the Town of Cochrane

Presented By: Nicolas Abarca, Urban Systems.
Time: Tuesday, 9:30 - 10:00 AM

The Town of Cochrane commissioned Urban Systems Ltd. to develop a comprehensive master plan for their water and sanitary infrastructure. The objective of this study was to establish service delivery goals to achieve minimum system performance standards and a minimum acceptable condition for infrastructure. Based on these goals, the performance of the existing system was analyzed and the requirements for future servicing were established.

Risk analyses were also conducted based on a ranking methodology that accounted for performance (based solely on pipe capacity), condition, and consequence of failure of each of the systems' pipe elements. The likelihood of failure of each element was established as a function the pipe's life expectancy, based on its material and age, and specific to the Town's past experiences. The consequence of failure was based on the actual location of the pipes and the ramifications associated with them failing. Final rankings were used for an initial identification of pipes within the Town's water and sanitary systems that should be replaced over the next 20 years. Rankings also allowed a prioritization of infrastructure upgrades based on risk and vulnerabilities in the systems.

This exercise constituted the first step towards the development of a comprehensive asset renewal program for the Town. Once completed, this program will ultimately establish the practical timing for replacements, consider budgetary constraints, and will be integrated with the Town's road upgrade program. Project costs would also be refined by considering alternative construction methods such as lining mains or other trenchless technologies.

pdf icon Presentation PDF


10.5 Pressure pipe design of water and force main plastic piping systems

Presented By: Dr. Mark Knight, University of Waterloo.
Time: Tuesday, 10:20 - 10:50 AM

This presentation will review the pressure design procedures of water and forcemain plastic piping systems that are commonly used in the US and Canada.

The presentation will be based on the published AWWA Standards and manuals for PVC (C900/C905 and M23) and for HDPE (AWWA C900/C906 and M55 and ASTM F714).

AWWA standards and manuals present three pressure limits for design: Working Pressure, Recurring Surge Pressure, and Occasional Surge Pressure. The presentation will review these limits and will demonstrate the use of the AWWA Standards and Manuals through multiple design examples.

The presentation will educate and train consultants and owners on the proper design of HDPE and PVC pipes for water and force main applications per the AWWA, ASTM and other publications.


10.6 AC watermain break probabilities and replacement planning tools – Nanaimo's experience

Presented By: Poul Rosen, City of Nanaimo.
Time: Tuesday, 10:50 - 11:20 AM

In British Columbia, there are many communities with significant amounts of AC watermain in their inventory. Much of this AC watermain was installed in the 60's and 70's and is reaching an age where it can be problematic.

Nanaimo has 140 km of AC watermains, which account for the majority of the City's watermain breaks. These breaks are a substantial hazard and liability for the community. To better understand what causes the breaks we completed a study of past breaks and the risk factors associated with them. This study resulted in the development of a decision making tool for capital replacement of AC watermains.

This paper is a case study of Nanaimo's experience with managing the AC watermain asset and development of the decision making tool for capital replacement.

Specifically we will discuss:

• Overview and break rates
• Typical response times and costs to fix a break
• Data collection for each break event and the database
• Analysis of break probability factors (we looked at age and pressure)
• Decision making process for capital replacement and map creation
• Cost of developing the decision making tool

This paper may be of interest to small communities with limited resources for managing their AC watermain inventory. The cost of developing the decision making tool for capital replacement was minimal and could be of substantial use to some communities.

pdf icon Presentation PDF


10.7 City of Kamloops – Existing 600mm AC Forcemain X,Y and Z mapping project

Presented By: Tim Ross, Pure Technologies Ltd.
Time: Tuesday, 11:20 - 11:50 AM

The City of Kamloops used Sahara technology to locate the horizontal and vertical position of 3 km of 600mm AC forcemain that serves a population of 46,000 people. The forcemain was installed in the 1970's and is now becoming a concern in terms of its age, capacity, and lack of redundancy.

The City's intent is to twin the line with a 750 forcemain. However, without accurate as built records for the 600 forcemain, design of the new main was not possible. The City attempted a geophysical investigation using electromagnetic mapping tools, cable and pipe locator, and ground penetrating radar. Unfortunately, the results of the program were generally inconclusive. As a second attempt, the City undertook hydrovac excavation at critical locations. This was successful, but expensive and provided limited information.

The Sahara technology is a tethered leak and gas pocket detection tool for pipeline inspection. The main reason the tool was selected for this application was the ability to track its sensor head from above ground as it moved through the forcemain. In addition, a new algorithm and tracking technique allowed for identifying the sensor head, and thus the pipe's, depth below the surface. In this manner, the forcemain was able to be mapped in X, Y, and Z coordinates.

The City has now completed design of the forcemain twin, and planning to begin construction in 2014. The project involves 3 km of 750mm diameter force main, ARVs, emergency pump connection chambers, crossing of Kinder Morgan transmission lines, and road restoration.

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