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Printer Friendly VersionSelected Information - Completed Research

CP372  Getting the Most from CCTV Inspections Sewerage
Project Appreciation and Objectives

Good quality CCTV images are key to understanding the rate of deterioration and setting investment levels for gravity sewers. Although CCTV sewer inspection has been in use for over 30 years, a number of new or emerging technological improvements have recently evolved which could deliver significant improvements to recorded and stored image quality. However a number of issues have arisen which need to be resolved to allow end users to correctly specify and control the quality of the new technology and also assess the potential benefits against the costs of specifying the improved technology.

This project reviewed the capabilities of existing CCTV equipment and the current specifications for underground sewerage surveys to ensure that end users can take full advantage of new and emerging technologies where benefits outweigh the costs

Benefits to Clients

  • Confidence that the most appropriate technology is being used to help determine sewer investment needs.
  • Understand and justify CCTV costs and benefits to help avoid costly procurement errors.
  • Improve the sewer survey specifications and ensure CCTV inspections are carried out to maximum effect but with minimal cost.
  • Improve the understanding between equipment manufacturers and end users to ensure well-defined CCTV product development programmes.

Work Programme

  1. Comprehensive review of existing and emerging CCTV equipment and related technology.
  2. Assess end user requirements, focussing on picture quality parameters, to establish the necessary capabilities for different types of inspection and varying sizes and types of sewer.
  3. Develop model specification clauses for both the equipment and video format, together with quality control procedures and guidance for end users on the most appropriate specifications for different applications.

Project Output

  • A comprehensive guidance document to select the most appropriate equipment, test methods and video file formats for CCTV sewer inspection work on drains and sewers of different sizes and materials.
  • A set of model specification clauses for a number of different options of equipment specification, quality control testing and video file formats. It is proposed that these clauses should be included as options in a future edition of the Model Contract Document for Sewer Condition Inspection. In the meanwhile they could be included as additional clauses.

Related Work

  • The Manual of Sewer Condition Classification and Model Contract Document for Sewer Condition Inspection, 2004
  • Sewerage Risk Management, CP309, 2008 - this update to the Sewerage Rehabilitation Manual includes structural investigation programmes of sewerage assets and procedures for inspection programmes, including requirements for CCTV inspections.
  • Project ISAAC, EC, 2001-2003 This project developed techniques for better sewer inspections by using image processing techniques that allowed operators to discriminate between essential and non-essential repairs.

WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

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