浸水想定区域
shinsui sōtei kuikiしんすいそうていくいき
Flood inundation zone
Areas modeled to flood under extreme rainfall, mapped with expected water depths. Read the depth, not just the shading: 0.5m means wet floors, 3m means a submerged ground story. Flood zoning feeds directly into insurance pricing and long-term resale value.
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