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CCTV Data Management for Effective Condition Assessment of Wastewater Collection Systems
Martel, K., F. LAI, K. Enfinger, AND R. Rowe. CCTV Data Management for Effective Condition Assessment of Wastewater Collection Systems. In Proceedings, NASTT 2010 No-Dig Show, Chicago, IL, May 02 - 07, 2010. North American Society for Trenchless Technology (NASTT), Liverpool, NY, Paper E-2-04, (2010).
Condition assessment provides critical information for determining an asset’s physical condition, remaining useful service life, and long-term performance. Data management issues integral to a successful condition assessment program are described in this paper. Key points are illustrated using examples from seven utility case studies in the USEPA-funded research project, Condition Assessment of Collection Systems. One of the initial steps in a condition assessment program is to collect historical system data such as pipe diameter, length, and installation dates; GIS information; flow data; and inspection and maintenance records for the collection system. Data are stored in flat files or an asset management database. It is important to evaluate the content and form of the data, and identify data gaps and data quality issues to maintain or improve data integrity. Various data sources can be integrated to help evaluate asset condition and determine needs for further inspection and/or maintenance. Data analysis involves the coding of asset defects observed during inspection, the conversion of defect codes to an asset condition rating, and prioritization of assets based on condition scores and/or risk-based scores. In this paper, the design and format of defect codes and available defect code systems will be discussed along with the selection of a data management system such as spreadsheets, condition assessment software, and other database software. Decision making, the final step in the condition assessment process, to a large degree, relies on closed-circuit television (CCTV) data and other available asset condition information to prioritize assets for various corrective actions including maintenance, further inspection, and total replacement. Some utilities have used a risk-based approach to supplement condition information.
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Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
WATER SUPPLY AND WATER RESOURCES DIVISION
URBAN WATERSHED MANAGEMENT BRANCH