SENDAI -Towards a Disaster-Resilient and Environmentally-Friendly City

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Urban Development

Earthquake Countermeasures in Sewerage Facilities

Construction of Sendai City’s sewerage utility dates back to 1899, however, the aging sewerage facilities lack earthquake resistance when measured against modern earthquake-resistance standards and there is risk that damage to sewers induced by seismic motions could cause flow functions to be lost and roads to collapse and so; hence it is urgently necessary to take countermeasures.

Following damage in the Great East Japan Earthquake, Minami-Gamo Wastewater Treatment Plant, which is Sendai’s most important sewage treatment facility, was restored based on the current earthquake-resistance standards, while other treatment plants and pump stations are successively being strengthened to withstand earthquakes.
Meanwhile, concerning sewers, since the No. 1 and No. 2 Minami-Gamo trunk lines, which are the most important sewers, cannot be surveyed due to always being filled with water, new trunk lines are being constructed to take on their burden. After they are completed, No. 1 and No. 2 Minami-Gamo trunk lines will undergo internal inspection and seismic strengthening as needed. As for other sewers, measures are being implemented on deteriorated sewers in built-up areas that lack earthquake resistance.