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The Next Generation of CCTV Inspection – City of Garland Case Study

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The use of closed circuit television (CCTV) to locate defects and establish the condition of critical assets is commonplace. This critical tool can reduce rehabilitation costs by establishing the existing condition of assets and thereby determine least cost repair methods and strategies. A new generation of inspection equipment combines this proven technology with laser and sonar sensors in one device.

The City of Garland performed a CMOM audit in 2007 and joined the Texas Commission on Environmental Quality (TCEQ) Sanitary Sewer Overflow Initiative (SSOI). These programs identified areas where the condition of assets and need for rehabilitation are in question. Of particular interest to the City was approximately 30,000 linear feet of 48 inch interceptor that has limited access along Rowlett Creek and has long reaches between manholes (approaching 2,400 linear feet). Conventional cleaning and CCTV equipment could not access much of the interceptor leaving the interceptor condition in question for decades. The condition of this aging interceptor was determined by utilizing a state of the art inspection device that combines high definition conventional CCTV cameras, laser profiling, and sonar sensors. Analysis of collected data determined the overall structural condition, magnitude of interior corrosion and location of capacity reducing debris.

This paper will present this emerging technology as a cost effective alternative to assess the condition of assets that were previously inaccessible. The process for completing the inspection and examples of the completed project data will be presented along with advantages and disadvantages of using this technology.

Those attending this paper will have insight into this emerging technology and leave with an understanding of its possible application to their system.
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Keywords: Administrative Order; CMOM Self-Audit; Compliance Order; EPA; Laser profiling; Pipeline Corrosion; Sanitary Sewer Overflow Initiative (SSOI); Sonar profiling; TCEQ SSO Initiative Plan

Document Type: Research Article

Publication date: 01 January 2011

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