Challenges after Disaster



sewarage works mascot "Moguro" Building Disaster Resistant Communities after Great Hanshin-Awaji Earthquake

January 17, 2020, marks 25 years since the disaster.
The Great Hanshin-Awaji Earthquake occurred on January 17, 1995 at 05:46:53 JST, in the cities of Kobe, Ashiya, Nishinomiya, Awaji and the southern part of Hyogo Prefecture.
The magnitude 7.3 quake, which reached the maximum of 7 on the Japanese seismic intensity scale, leaving 6,434 people dead.
In Kobe, the sewerage system was damaged including the destruction of our main office building, Higashinada WWTP, sewers, etc.

Damaged to public facilities

Great Hanshin-Awaji Earthquake
main bilding highway

Damage to Sewerage Facilities

Damae to WWTP   Damage to sewer
map2   map3
Higashinada Wastewater Treatment Plant(WWTP) was completely damaged, due to loss of loss of electric power, gas, and water supplies.
Treatement functions ware reduced to 50% at Chubu WWTP and to 20% at Seibu WWTP.
  Damage to Sanitary Sewer : 3,315km
Damage to stormwater Sewer : 484km
Total : 3,799km

Situation of Damages at Higashinada WWTP

The largest WWTP of the city (daily effluent volume: 160,000 m3 per day) was out of commission for 100 days.

Damage to Final Sedimentation Tank (FST)   Destruction of Influent Channel
Damage to Final Sedimentation Tank (FST)   Destruction of Influent Channel
Destruction of Foundation Piles    
Destruction of Foundation Piles    

Emergency Restoration - Primary Treatment -

For around 100 days, sediment treatment carried out inside the canal.

Temporary Closing of Canal   Sludge Thickening Facilities
Temporary closing of Canal    Sludge Thickening Facilities
The Whole View of Canal    
The Whole View of Canal    


Recovery and Rehabilitation

Learning from the Great Hanshin Awaji Earthquake in 1995, Kobe City has established its Disaster Resistant Sewerage System. Damaged pipes have been replaced or rehabilitated using major pipe lining methods, and the new“sewerage network system”has been completed.

Sewerage Network System   Temporary Toilets

Underground large diameter shielded pipeBased in the lessons from the Great Hanshin-Awaji Earthquake, Kobe City has completed construction of a sewerage network system connecting 4 WWTPs via a deep underground large diameter shielded pipes (total length: approx. 33 km), and started its operation since 2011. This sewerage network system will continue operating if disaster strickes.

  Temporary ToiletsWe have installed temporary toilet systems that are directly connected to sewers in the locations including elementary schools which are used as emergency shelters during disasters.
Extending life of pipes   Use of Recycled Water
technology used in pipe rehabilitationMaking a lining pipe for change of an old pipe by feeding of the lining materials in the old pipe, which must be formed to fit the pipe's shape and must be flexible and light enough.   water reuse in urban areasWater reuse makes it possible to provide additional fire protection and to supply water for the flashing of streets, drains, and toilets.



電話 0570-083330 または 078-333-3330



〒651-0084 神戸市中央区磯辺通3-1-7 コンコルディア神戸3階

Management Division, Sewage Works Department,
Public Construction Projects Bureau, City of Kobe
Contact: Concordia Kobe Bldg., 3rd Floor, 3-1-7, Isobe-dori, Chuo-ku, Kobe, Hyogo, 651-0084, Japan
TEL: 81-78-806-8709/FAX: 81-78-322-6090