Implementing structural measures to reduce the risk of road damage

After the 2011 Great East Japan Earthquake, the main highways and roads to the affected areas were back up and running within weeks, which greatly expedited relief and recovery operations. This was largely due to robust structural measures, in conjunction with efficient recovery work by public services. In contrast, it took over 1 and a half years for the highway to be reconstructed after the Great Hanshin-Awaji Earthquake in 1995.

  • Financial resources and will to invest in structural resources.
  • Technological and engineering capacity to implement large-scale structural measures.
  • Structural measures reduce the risk of road damage due to geohazards, reduce road maintenance costs, ensure connectivity during and after disasters, and contribute to the speedy recovery of a road after geohazard events.
  • Bio-engineering and other types of structural measures can be implemented during the road construction, operation and maintenance stages.
  • A thorough assessment of geographical, geological, geotechnical, hydrological, and hydraulic conditions are essential for the effective design of structural measures.
Conducting risk assessment of geohazards and planning for both new and existing roads

Roads, expressways, and other public facilities helped reduce damage and loss of life in the 2011 Great East Japan Earthquake by providing protection against flooding, owing largely to successful risk assessments carried out pre-construction. For example, the East Sendai Expressway (elevation of 7 to 10 meters) acted as a secondary barrier against the incoming tsunami, preventing the waves from penetrating further inland. Over 200 people escaped by running up to the expressway, and its embankment served as an evacuation shelter for local residents.

  • Having sufficient resources to conduct risk assessments.
  • Availability of relevant data to conduct accurate assessments and inform planning of new and existing roads.
  • Pre-concept risk identification is crucial. For new roads, geohazard risk evaluations enable management authorities to make informed decisions on how to avoid hazardous locations.
  • Hazard mapping, evaluation of exposure levels, and determining potential impacts on the social environment are essential for holistic road geohazard risk management.
  • Determining potential economic impacts incurred from loss of road access and conducting a cost-benefit analysis of potential investments to mitigate geohazards are critical. The results of these assessments help identify and prioritize endangered locations and inform risk reduction measures.
Establishing an adequate institutional framework

Relevant institutions in Japan work together to create and enact appropriate laws and regulations, as well as national and local government plans and strategies (e.g., Japan Rail, local government, and Ministry of Land, Infrastructure, Transport and Tourism collaborating on road geohazard risk management). Japan’s framework also includes institutional and technical coordination, and appropriate funding mechanisms. For example, the cost of adding height to an expressway can be shared by both public works organizations and disaster risk management organizations. These types of cost-sharing mechanisms ensure that financial burdens are shared equitably.

  • Political will to establish adequate institutional framework, laws, and regulations.
  • Financial resources to implement funding mechanisms.
  • Disaster risk management organizations and public works organizations can share costs of certain infrastructure investments.
  • National and local government and other key stakeholders should coordinate strategies related to disaster risk management, including the use of infrastructure and public facilities such as roads, highways, and railways. These facilities can be used to enhance disaster management procedures and operations in the event of geohazards such as floods, tsunamis, and landslides.
World Bank
Establishing an adequate institutional framework
Conducting risk assessment of geohazards and planning for both new and existing roads
Implementing structural measures to reduce the risk of road damage
Making additional non-structural risk reduction measures
Conducting post-disaster activities
Financial support by national government and schemes to reduce financial burden of local governments

The national government provides local governments with additional subsidies for seismic retrofitting and reconstruction of schools with insufficient seismic capacity. In principle, national subsidies for retrofitting and reconstruction cover one-third of associated costs for public elementary and junior high schools, but the national share has been raised to two-thirds and one-half respectively in 2008 under the Act on Special Measures for Earthquake Disaster Countermeasures. Furthermore, additional sources of funding were generated through local bonds and local tax allocation by local governments. In Shizuoka prefecture, located in the Tokai area where earthquake probability is high, the local government increased corporate income tax by 7-10 percent for 15 years to allocate budget for making public buildings more earthquake resistant. Kushiro municipality’s retrofitting completion rate remained at 50 percent for a decade due to lack of funds, however, this increased the rate to 85.8 percent within 3 years of introducing the PFI system.

  • Mutual understanding of stakeholders of the importance of investing in the retrofitting of schools.
  • Commitment by municipal governments on the promotion of the program.

Proactive support by the national government was an essential part in achieving the retrofitting of schools across Japan. Progress to achieve the goal of the program was initially slow due to the financial burden on the local governments. The national government responded by increasing the national subsidies in seismic retrofitting and reconstruction. In addition, when there was difficulty in securing sufficient funding for retrofitting subsidies from the initial national budget, the government explored the use of supplementary budget and reserve fund.

Promoting ownership of the social community-based restoration initiative and the participation of all social classes

An initial meeting between the traditional and religious authorities of Mogazang was held to gather all useful information and raise awareness among the population. As a next step, a socio-economic study was carried out in order to understand the potential social, economic and environmental impacts and challenges of the restoration initiative. The elaboration of a map by the community members under the guidance of the advisory team allowed the demarcation of a plot of degraded land (10.74 ha) for restoration. The reforestation initiative aimed at providing firewood, fodder, food products and medicinal plants, among others. The government owns the selected plot, under the supervision of the Executive Bureau for Development of the village. However, it is managed ‘by the people, for the people’.

  • Always ensure that the population’s concerns are well understood and that the proposed solutions will indeed contribute to solve their problem
  • Involve representatives of all member groups of the society (particularly women and children)
  • Ensure that there is no conflict of interest or disputed land rights regarding the project site
  • Select qualified local people with sufficient education to write short activity reports and foresee their technical and managerial capacity building
  • Given the habits and customs of the Muslim community in the area where the initiative is implemented, it was challenging to actively involve women in the discussions.
  • Subsequently, we were able to demonstrate the benefits of incorporating the women’s perspective in the discussions and thus achieved their better integration. Indeed, women are those who, on a daily basis, travel long distances in search of firewood justifying the need to involve them in the activities of the initiative.
  • To achieve the feeling of ownership among the beneficiaries it is necessary to have administrative and traditional authorities to mobilise them.These authorities, however, tend to emphasize the monetary aspect, which can reduce the achievement of the objectives.
GIZ
Promoting ownership of the social community-based restoration initiative and the participation of all social classes
Micro-zoning of the selected plot according to the soil type, the topography and the identification of adapted local plant and tree species
Development of specific techniques to protect and irrigate the plants
Promotion of income-generating activities and of improved stoves
GIZ
Promoting ownership of the social community-based restoration initiative and the participation of all social classes
Micro-zoning of the selected plot according to the soil type, the topography and the identification of adapted local plant and tree species
Development of specific techniques to protect and irrigate the plants
Promotion of income-generating activities and of improved stoves
GIZ
Promoting ownership of the social community-based restoration initiative and the participation of all social classes
Micro-zoning of the selected plot according to the soil type, the topography and the identification of adapted local plant and tree species
Development of specific techniques to protect and irrigate the plants
Promotion of income-generating activities and of improved stoves
bimala dahal
Establishing a value chain for remote smallholder farmers
Creating demand for organic products in domestic, urban developing markets
Capacity building for de facto but uncertified organic producers