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From California to Massachusetts, from Ohio to Oklahoma, from 30-inch to 120-inch, round, odd-shaped, concrete and brick sewers, with and without flow and with inspection runs as long as 7,500-feet, new inspection technology providing data for condition assessments was considered impossible
only a few short years ago. Although millions of feet of sewer lines are televised in the United States each year, larger interceptors that carry significant flow are often ignored because of accessibility issues, lack of redundancy, safety concerns, illumination, cost, clarity of information
and the difficulty and cost of dewatering. Since mid-2008, multi-sensor technology has provided the tools to finally overcome many of the obstacles that were encountered in the past. More and more municipalities are using this type of technology to inspect sewers and make more appropriate
rehabilitation decisions, which continually proves the cost effectiveness of this value-added tool. Currently more than one million feet of large diameter sewers have been inspected using multi-sensor technology. Using a combination of a high definition camera and various combinations of
laser technologies above the water surface, observations of corrosion, deflection, ovality, missing brick courses, damaged pipes, poor bedding, etc. are recorded. Below the water surface, sonar technology identifies the depth and volume of debris and major structural anomalies without the
need for expensive dewatering systems. When all of these data collectors are contained on a single delivery system, the inspections can be economically performed in a single insspection run. The collected data is processed into a single submittal with videos simultaneously presenting the
laser above the water surface and the sonar below the water surface. The HD camera data is submitted in a video with PACP coding that can be incorporated into most municipal databases. Data reports with still photographs, computer-generated drawings and findings at their specific locations
supplement the videos.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.