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Woodbridge, Canada

Roshani E.,HydraTek and Associates Inc. | Filion Y.R.,Queens Univ.
Journal of Water Resources Planning and Management | Year: 2014

Municipalities with limited budgets will have to rehabilitate their stock of deteriorated water mains in the coming decades. Optimization and asset management offer municipalities the opportunity to plan the rehabilitation of their water mains in a more rational manner. The aim of this paper is to develop a new event-based approach to optimize the timing of water main rehabilitation. The approach incorporates a new gene-coding scheme and covers the full range of decisions about pipe replacement, duplication, lining, new pipe installation, and asset management strategies (infrastructure adjacency and quantity discounts applied to the installed pipe). The new approach is applied to the Fairfield water network, and results suggest that applying a budget constraint prohibits early investment in pipe rehabilitation with a resulting increase in leakage, pipe breaks, and energy costs. Applying pipe discounts decreases capital and operation costs and favors pipe lining over pipe replacement and duplication in the Fairfield network. A sensitivity analysis suggests that uncertainties in demand, leakage, and break growth rate have a moderate to significant impact on capital and operation costs. © 2014 American Society of Civil Engineers. Source


Roshani E.,HydraTek and Associates Inc. | Filion Y.R.,Queens University
Journal of Water Resources Planning and Management | Year: 2014

Many countries are considering policy instruments such as a carbon tax and economic discounting to reduce greenhouse gas (GHG) emissions in key sectors like the water sector. This paper examines the impact of economic discounting and a carbon tax on the optimization of water main rehabilitation. A new pipe rehabilitation optimization algorithm that accounts for GHGs was developed and applied to the Fairfield water distribution system in Amherstview, Ontario, Canada. GHG intensity factors for the provinces of Ontario (low-carbon) and Alberta (high-carbon) were applied to the Fairfield network. In both cases, adopting a low discount rate and levying a carbon tax had a weak effect in reducing energy use, GHG emissions, pipe breaks, and leakage. Further, a low discount rate and a carbon tax encouraged the search process to invest in rehabilitation early in the planning period to reduce continuing leakage, pipe repair, energy, and GHG costs. © 2014 American Society of Civil Engineers. Source


Papa F.,HydraTek and Associates Inc. | Radulj D.,HydraTek and Associates Inc. | Karney B.,University of Toronto | Robertson M.,Robertson Technology Pty Ltd
Journal of Water Supply: Research and Technology - AQUA | Year: 2014

A large-scale pump performance and efficiency testing program was conducted across the province of Ontario (Canada) involving testing more than 150 water pumps in eight municipal water supply and distribution systems. The program's objectives included raising awareness of the state of pump energy efficiencies and opportunities for energy conservation, as well as the development of a benchmarking report which can be used as a key reference by water utilities in their efforts to improve the energy efficiency of their pumping systems. This is the first program of its kind in Canada and seeks to establish an understanding of the performance and effi ciency of water pumps in the field using state-of-the-art thermodynamic technology. The generalized results of this program indicate that the average efficiency of the pumps tested is 9.3% lower efficiency than the manufacturer 's original claims at the best efficiency point, while the average gap between the manufacturer's original best efficiency point and actual point of operation in the field was 12.7%. © IWA Publishing 2014 Source

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