Japan also considers providing similar maps to countries other than the Southeast Asia region. (Photo: TD).

In Japan, flood risk maps are available in various regions of Japan, showing the frequency and depth of flooding caused by floods. Based on observational data collected on the ground, including rain gauges, the maps show that the risk of flooding from heavy rainfall is likely to occur every 10, 30, 50, 100 150 or 200 years, along with information used to facilitate evacuation and community planning.

Vietnam, Indonesia, Thailand, and Cambodia are four Southeast Asian countries often affected by floods. According to the Japanese Ministry of Land, Infrastructure, Transport, and Tourism, these countries do not have enough observational data on the ground. The maps that clearly show flood risk in target areas can provide useful information and support risk prevention and management for the local authorities. Specifically, maps of targeted areas will be created after simulating floods using observational data collected using the Global Satellite Precipitation Map (GSMaP). This system is operated by the Japan Aerospace Exploration Agency and other agencies.

The Japanese side has begun discussions with four countries in fiscal 2023 to select target areas. The agency plans to provide a prototype version of the map to each country by the end of fiscal 2025.

In addition to preparing guidelines including the mapping process, the Japanese Ministry of Land, Infrastructure, Transport and Tourism will also develop human resources through training programs. The maps are expected to be made available to the public in each country.

Many Japanese companies that operate in the above four countries expect to make good use of the flood risk map. It will help them choose office or factory locations and prepare business disaster plans.

Japan also considers providing similar maps to countries other than the Southeast Asia region.

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