Comprehensive health condition assessment on partial sewers in a southern Chinese city based on fuzzy mathematic methods

Abstract

A self-developed sewer health assessment system using the fuzzy comprehensive evaluation and analytical hierarchy process was applied to give a comprehensive health condition evaluation on part of the local sewers in a southern Chinese city based on the sewer video data collected by a sewer inspection closed circuit television (CCTV) robot. Aside from the overall condition evaluation, the structure, function, and stability status of the sewer were also analyzed using the method. A comprehensive index H was proposed to give the overall health condition of pipes with different defects, and H_t, H_s, and H_f were used to quantify the defects affecting the tightness, stability, and function of the pipe, respectively. Results show that 48% of the inspected pipes were in good condition (0<H<0.25), and about 33% of the sewer pipes analyzed were categorized to be at severe or urgent condition levels (H>0.5), although most of the pipes were installed only within five years. Frequent sedimentation affects the function of the sewer, and deformation and joint damage affect the structure of the sewer.

Keywords

sewer / health condition assessment / analytical hierarchy process / fuzzy comprehensive evaluation / fuzzy mathematic method

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Acknowledgements

This research was supported by the Mega-Projects of Science Research for Water Environment Improvement (Nos. 2008ZX07313-004 and 2011ZX07301-002). We would like to express our gratitude to the people in the local sewer management authority, who provided necessary sewer data and convenience during the cooperation.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg