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Implementation of a Risk-Based Approach to Sanitary Sewer Asset Management

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The West Valley Sanitation District operates and maintains 426 miles of sewers. Based on a previous dry weather monitoring study and subsequent CCTV inspection activities, the District established an extensive list of needed rehabilitation projects spread throughout the service area, yet did not have an objective methodology for prioritization of these projects. The District decided to develop and implement a risk-based prioritization process based on guidelines recommended by the National Association of Clean Water Agencies (NACWA) in the publication “Implementing Asset Management: A Practical Guide”. The analysis focused on quantifying and assessing the risks posed in the case of asset failure or inability of the District's sewers to provide service to customers at a level that is acceptable to the District. Using this approach, consequence of failure and likelihood of failure were quantified to calculate risk of failure for individual sewer assets. The risk scores were then used to prioritize sewer rehabilitation or replacement projects. The District has also found the risk scores to be useful in prioritizing system-wide CCTV inspection for the sewer system. This presentation will review the methodology, approach, and results of the risk-based prioritization model.
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Keywords: Prioritization; Risk; Sewer; asset management

Document Type: Research Article

Publication date: 2011-01-01

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