A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Iqaluit, Nunavut—Sewer Main Replacement in Permafrost
The water and sewer systems in Iqaluit generally consist of shallow-buried, urethane-foam insulated, high-density polyethylene pipe. A trunk sewer through the Lower Base neighourhood conveys sewage from approximately 20 percent of the community, and because of capacity and condition issues, this sewer needs replacement. The replacement is a complex project because of the technical issues associated with the permafrost ground conditions, the existing alignment of the pipes, the remedial work required on the access points of the system, legacy contamination concerns, and the logistics of providing temporary servicing. The permafrost ground conditions have an active layer that may extend as deep as 3 m and produce very wet and unstable ground conditions. The existing alignment of the services includes a water main, a water recirculation main, as well as the sewer main, which should be appropriately separated horizontally and vertically. In addition, all 3 pipes run through insulated metal access vaults. The replacement neighourhood is a commercial district of Iqaluit which will require temporary services for domestic use as well as fire flow. The design development has included options for replacing the water and sewer services within the same trench, and alternately, the development of an independent new sewer system. An independent system was selected as the most appropriate solution, which will allow continuous operation of the existing water and sewer system, provide an emergency bypass for future maintenance works, reduce the risk of watermain contamination and reduce temporary services requirements during construction.
Iqaluit, Nunavut—Sewer Main Replacement in Permafrost
The water and sewer systems in Iqaluit generally consist of shallow-buried, urethane-foam insulated, high-density polyethylene pipe. A trunk sewer through the Lower Base neighourhood conveys sewage from approximately 20 percent of the community, and because of capacity and condition issues, this sewer needs replacement. The replacement is a complex project because of the technical issues associated with the permafrost ground conditions, the existing alignment of the pipes, the remedial work required on the access points of the system, legacy contamination concerns, and the logistics of providing temporary servicing. The permafrost ground conditions have an active layer that may extend as deep as 3 m and produce very wet and unstable ground conditions. The existing alignment of the services includes a water main, a water recirculation main, as well as the sewer main, which should be appropriately separated horizontally and vertically. In addition, all 3 pipes run through insulated metal access vaults. The replacement neighourhood is a commercial district of Iqaluit which will require temporary services for domestic use as well as fire flow. The design development has included options for replacing the water and sewer services within the same trench, and alternately, the development of an independent new sewer system. An independent system was selected as the most appropriate solution, which will allow continuous operation of the existing water and sewer system, provide an emergency bypass for future maintenance works, reduce the risk of watermain contamination and reduce temporary services requirements during construction.
Iqaluit, Nunavut—Sewer Main Replacement in Permafrost
Lecture Notes in Civil Engineering
Walbridge, Scott (editor) / Nik-Bakht, Mazdak (editor) / Ng, Kelvin Tsun Wai (editor) / Shome, Manas (editor) / Alam, M. Shahria (editor) / el Damatty, Ashraf (editor) / Lovegrove, Gordon (editor) / Crawford, I. (author) / Johnson, K. (author) / Plourde, S. (author)
Canadian Society of Civil Engineering Annual Conference ; 2021
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021 ; Chapter: 6 ; 57-62
2022-05-18
6 pages
Article/Chapter (Book)
Electronic Resource
English
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