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Comparative Risk Assessment of Environmental, Health, and Safety Risks in Urban Sewer Network Rehabilitation Using Traditional and CIPP Methods with William Fine's Approach
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Forouzan Farrokhian   , Bahman Zolfagharifar |
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Abstract: (16 Views) |
Urban sewer networks, as one of the most vital infrastructures, play an essential role in maintaining public health and the environment. The repair and rehabilitation of these networks are consistently accompanied by various risks in the environmental, health, and safety domains. This research was conducted in 2025 to evaluate the environmental, health, and safety risks associated with the use of two methods: traditional and CIPP (Cured-In-Place Pipe). The statistical population under study included all activities, equipment, and technical operations related to the urban sewer network rehabilitation project. The William Fine technique was utilized for risk assessment, and risk levels were categorized into three groups: acceptable, undesirable, and emergency. The findings indicated that the traditional method, based on open-trench excavation, besides disrupting urban traffic, leads to the release of pollutants, ecosystem damage, and increased safety hazards for personnel. In the CIPP method, safety risks from working with heavy machinery, health risks associated with personnel exposure to sewage, and environmental risks including soil, water, and air pollution are reduced compared to the traditional method. In this study, a total of 193 risks were identified for the traditional method and 208 risks for the CIPP method. In the traditional method, the causes of hazards included: human factors (43.5%), equipment (33.6%), and execution (22.8%). In the CIPP method, the causes of hazards included: human factors (37%), equipment (34.6%), and execution (28.4%). The results of the assessment after implementing control measures showed that in the traditional method, emergency risks decreased from 26.9% to 2.1%, and acceptable cases increased from 28% to 63.7%. In the CIPP method, emergency risks decreased from 39.9% to 0.5%, and acceptable cases increased from 8.7% to 75.5%. Therefore, the CIPP method demonstrates higher effectiveness than the traditional method in reducing environmental, health, and safety risks and can be used as a sustainable approach for urban infrastructure rehabilitation.
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Article number: 3 |
| Keywords: Sewer Network Rehabilitation, Risk Assessment, Traditional Method, CIPP Method. |
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Full-Text [PDF 757 kb]
(6 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2025/07/20 | Accepted: 2025/11/30 | Published: 2025/11/30
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