The seismic performance of sewage collection networks is of great importance due to their vast coverage, critical functionality, and the potential consequences of their sudden failure. The sewage network in Tehran, with an estimated length of 9,000 kilometers, is particularly susceptible to various transient short-term and long-lasting impacts resulting from earthquake incident in the city. Furthermore, considering the potential direct and indirect damages caused by seismic damage to this network, the importance of addressing this issue becomes even more evident. In other words, failure in this network could even lead to a major crisis in the city.
This is particularly important in a seismically active region, with numerous seismic sources and active faults identified within the sewage network area for the city of Tehran.
This guideline has been prepared by the Tehran Sewerage Company, in collaboration with the International Institute of Seismology and Earthquake Engineering (IIEES). In this document, an effort has been made to provide a simple approach to design and evaluate buried sewage pipelines in Tehran. The document also thoroughly adheres to the relevant and valid national and international regulations and guidelines, as well as the technical specifications and operational conditions of sewage systems in Iran. At the same time, enough care has been taken to ensure that the simplicity of the proposed formulas does not undermine their reliability.
Undoubtedly, this guideline, which represents the first effort by the Tehran Sewerage Company to reduce the seismic vulnerability of these networks, is not without flaws, given the limited experience in this area within the country. It is hoped that the feedback received during the initial implementation phase will lead to improvements and the resolution of existing issues.
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