System Chikuma River Shinano River System Saigawa River Shinano River System Susobana River Shinano River System Asakawa River Map of Estimated Flood Extents Map of Estimated Flood Extents Map of Estimated Flood Extents Map of Estimated Flood Extents （Estimated maximum rainfall） （Estimated maximum rainfall） （Estimated maximum rainfall） （Estimated maximum rainfall）

Rainfall assumed: Total rainfall of 396mm for two consecutive days in Rainfall assumed: Total rainfall of 396mm for two consecutive days in Rainfall assumed: Total rainfall of 660mm in 24 hours in the entire Rainfall assumed: Total rainfall of 766mm in 24 hours in the entire the Chikuma River basin the Saigawa River basin Susobana River basin Asakawa River basin Map created by: Chikuma River Office, Hokuriku Regional Development Map created by: Chikuma River Office, Hokuriku Regional Development Map created by: Prefecture Map created by: Bureau, Ministry of Land, Infrastructure, Iizuna Town Bureau, Ministry of Land, Infrastructure, Iizuna Town Iizuna Town Transport and Tourism Transport and Tourism Iizuna Town

Nagano City Town Obuse Obuse Town Obuse Town Town

Nagano City Nagano City Nagano City

Suzaka City

Suzaka City Suzaka City

Suzaka City

Map Keys Map Keys Estimated water depths in case of flooding Estimated water depths in case of flooding Map Keys Map Keys （By water depth） （By water depth） Estimated water depths in case of flooding Estimated water depths in case of flooding Flooded areas with a water depth of less than 0.5m Flooded areas with a water depth of less than 0.5m （By water depth） （By water depth）

Flooded areas with a water depth of 0.5m - less than 3.0m Flooded areas with a water depth of 0.5m - less than 3.0m Flooded areas with a water depth of less than 0.5m Flooded areas with a water depth of less than 0.5m

Flooded areas with a water depth of 3.0m - less than 5.0m Flooded areas with a water depth of 3.0m - less than 5.0m Flooded areas with a water depth of 0.5m - less than 3.0m Flooded areas with a water depth of 0.5m - less than 3.0m

Chikuma Flooded areas with a water depth of 5.0m - less than 10.0m Flooded areas with a water depth of 5.0m - less than 10.0m Flooded areas with a water depth of 3.0m - less than 5.0m Flooded areas with a water depth of 3.0m - less than 5.0m City Chikuma City Flooded areas with a water depth of 10.0m - less than 20.0m Flooded areas with a water depth of 10.0m - less than 20.0m Flooded areas with a water depth of 5.0m - less than 10.0m Flooded areas with a water depth of 5.0m - less than 10.0m Ｓ＝1：100000 Ｓ＝1：100000 Ｓ＝1：70000 Ｓ＝1：50000

0 1000 2000 3000 4000m Municipal borders 0 1000 2000 3000 4000m Municipal borders 0 1000 2000 3000m Municipal borders 0 1000 2000m Municipal borders

Shinano River System Chikuma River Shinano River System Saigawa River Shinano River System Hirukawa River Map of Estimated Flood Extents / Flood Duration Map of Estimated Flood Extents / Flood Duration Iizuna Town Map of Estimated Flood Extents （Estimated maximum rainfall） （Estimated maximum rainfall） （Estimated maximum rainfall）

Rainfall assumed: Total rainfall of 396mm for two consecutive days in Rainfall assumed: Total rainfall of 396mm for two consecutive days in Rainfall assumed: Total rainfall of 813mm in 24 hours in the entire the Chikuma River basin the Saigawa River basin Shinano River System Torii River Hirukawa River basin Map created by: Chikuma River Office, Hokuriku Regional Development Iizuna Town Map created by: Chikuma River Office, Hokuriku Regional Development Iizuna Town Map created by: Nagano Prefecture Bureau, Ministry of Land, Infrastructure, Bureau, Ministry of Land, Infrastructure, Map of Estimated Flood Extents Transport and Tourism Transport and Tourism （Estimated maximum rainfall）

Rainfall assumed: Total rainfall of 715mm in 24 hours in the entire Torii River basin Map created by: Nagano Prefecture

Obuse Nagano City Obuse Town Town Nagano City

Nagano City Nagano City

Suzaka City Obuse Suzaka City Town

Suzaka City

Map Keys Map Keys Flood duration Flood duration Chikuma City (for flood depths of 0.5m or more) (for flood depths of 0.5m or more) (By duration) (By duration) Map Keys Map Keys Less than 12 hours Less than 12 hours Estimated water depths in case of flooding Estimated water depths in case of flooding 12 - less than 24 hours (1 day) 12 - less than 24 hours (1 day) （By water depth） （By water depth）

24 - less than 72 hours (3 days) 24 - less than 72 hours (3 days) Flooded areas with a water depth of less than 0.5m Flooded areas with a water depth of less than 0.5m

72 - less than 168 hours (1 week) 72 - less than 168 hours (1 week) Flooded areas with a water depth of 0.5m - less than 3.0m Flooded areas with a water depth of 0.5m - less than 3.0m Chikuma City 168 - less than 336 hours (2 weeks) Chikuma 168 - less than 336 hours (2 weeks) Flooded areas with a water depth of 3.0m - less than 5.0m Flooded areas with a water depth of 3.0m - ess than 5.0m City 336 - less than 672 hours (4 weeks) 336 - less than 672 hours (4 weeks) Flooded areas with a water depth of 5.0m - less than 10.0m Flooded areas with a water depth of 5.0m - less than 10.0m Ｓ＝1：100000 Ｓ＝1：100000 Ｓ＝1：30000 Ｓ＝1：30000

0 1000 2000 3000 4000m Municipal borders 0 1000 2000 3000 4000m Municipal borders 0 500 1000 1500m Municipal borders Municipal borders 0 500 1000 1500m