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Implementation of earthquake measures

  • In case of sewage infrastructures damaged, serious affects are given to peoplefs health and social activities, for example not only public sanitation problem and traffic problems but also no available of toilets etc.
  • Sewage system is different from other life-line infrastructures and there is no other alternative method to function as like sewage system. Even though, earthquake measures have not completed in main facilities yet.
  • By combination of two types of measures, the integrated measure is implemented, one is gProtectionh as earthquake resistant of main facilities the other is gMitigationh as minimization of damages with estimated earthquake situations.

Estimated damages by large earthquake and earthquake resistant of existing facilities

Serious affects in case of damaged sewage facilities
Serious affects in case of damaged sewage facilities
Proportion of earthquake resistant facilities constructed before 1997 when the interim guideline was applied (at the end of 2007)
Proportion of earthquake resistant facilities constructed before 1997 when the interim guideline was applied (at the end of 2007)
Feature as life line of sewage system
Feature as life line of sewage system
Examples of damaged sewage facilities
Examples of damaged sewage facilities

 

Implementation of integrated measures

Implementation of integrated measures
Implementation of integrated measures

 

Effectiveness of construction

  • By earthquake resistant of sewer pipes, the function of flowing sewage can be kept at large earthquake
    @Example: By soil improvement with cement solidification method, re-construction of sewer pipes after the earthquake in 2004 was done, as the result, there was no damage on the pipes at the earthquake in 2007
As the result of earthquake resistant, there was no damage at 2007 Niigata Tyuetu earthquake
As the result of earthquake resistant, there was no damage at 2007 Niigata Tyuetu earthquake

 

Earthquake
Magnitude Dept (km)
Damage of sewage facilities
No. of tows
Damage cost
(million JPN)
Damages at WWTP
Damaged
sewer line
(km)
Niigata-Tyuetu October 13 th , 2004
M6.8 Approx. 13km
(Niigata Pref)
6 cities,
12 towns,
3 villages
20,579
EMalfunction of wastewater treatment facility caused by broken inflow pipe at Horinouchi WWTP
152
Noto-Hantou March 25 th , 2007
M6.9 11km
(Ishikawa Pref)
3 cities
3 towns
1,882
 
15
Niigata-Tyuetu July 16 th , 2007
M6.8 17km
(Niigata Pref)
4 cities
1 town
(Nagano Pref)
1 city
6,203
EFoundation pile of sludge treatment facility was partly damaged.
EDucts and pipes were broken at Kasiwazaki WWTP
53
Iwate-Miyagi Nairiku June 14 th , 2008
M7.2 Approx. 8km
(Iwate Pref)
2 cities
(Miyagi Pref)
1 city
504
ECirculator of primary digester was broken at Mizusawa WWTP
3
Remarkable damages of sewage facilities