| Title |
Sewer CCTV Inspection Prioritization Based on Risk Assessment |
| Authors |
손주영(Son, Jooyoung) ; 이재현(Lee, Jaehyun) ; 오재일(Oh, Jeill) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.3.0585 |
| Keywords |
CCTV 조사;중점관리 하수관로;조사 우선순위;위험도 기반 조사;하수관로 상태평가 CCTV inspection;Critical sewer;Prioritization;Risk-based inspection;Sewer condition assessment |
| Abstract |
Most sewer lines buried in the city are likely to be collapsed due to serious aging. Also, due to the high concentration of development and high population density and traffic, the collapse of the sewer will cause enormous social and economic damage. Therefore, proactive maintenance is required to prevent accidents caused by deteriorated sewer pipe. In order to utilize limited budget effectively, risk-based prioritization methods should be proposed that simultaneously consider the consequence of failure and the probability of failure. In this study, the method of risk-based prioritization of sewer was examined by reviewing various cases of overseas studies and applied to the urban sub-catchment. First, the impact factors that can be secured through the sewer GIS DB in Seoul were derived, and the weight, sub-criteria, and impact score of each impact factor were determined and the consequence of failure was calculated by weight sum method. In addition, the probability of failure was calculated by dividing the service life by the estimated useful life, and the consequence of failure and the probability of failure were classified into five grades by the Jenks natural breaks classification method. The prioritization method was applied to sub-catchment in the Seoul to derive a risk matrix and a risk grade. As a result, 26% of all subjects were selected as the inspection priority subjects with 4-5 risk grade. Therefore, using the risk-based CCTV prioritization methodology, it will be possible to systematically determine the objects that need investigation first. |