Flood Control for Typhoon 18 at Yodo River System in Avoidance of Catastrophe through Coordinated Operation of 7 Dams -

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1 Flood Control for Typhoon 18 at Yodo River System in 2013 Asian Water Cycle Symposium Avoidance of Catastrophe through Coordinated Operation of 7 Dams - 1 st Mar Authors Masayuki KANMURI, Hiroshi MORITA (Ministry of Land, Infrastructure, Transport and Tourism) Masayuki KITAMAKI, Hideshi TAKEZAWA, Tahiro AOYAMA, Hirohisa MIURA (Japan Water Agency) View of HIYOSHI DAM at 1:45,16th,Sep Presenter Kentaro KIDO (Japan Water Agency) 1

2 Outline of Yodo River System Lake Biwa Kyoto Dam Barrage Osaka City 2

3 7 Dams/1 Barrage in Yodo River Basin Hiyoshi Dam Lake Biwa Katsura R. Overflowed Point Kyoto Seta River Barrage Amagase Dam Yodo Main R. Uji R. Takayama Dam River Basin Area(km 2 ) Name Basin Area km 2 3 Rivers Confluence point Rate % Lake Biwa 大阪湾 3, Uji R Katsura R. 1, Kizu R. 1, Yodo Main R Total 7, Nunome Dam Murou Dam Shorenji Dam Kizu R. Hinachi Dam 3

4 Typhoon No.18 in 2013 For the first time, Emergency weather warning for heavy rainfall announced in Yodo River Basin and 180,000 people received evacuation advisories. Typhoon No.18 in Sep Total Rainfall Lowest pressure 960hpa (36hours 3:00, 15 th 15:00, 16 th ) Highest winds 35m/s (162km/h) Rainfall Rader at 05:00 16 th Sep. Kyoto Typhoon direction Source: Japan Weather Association 4

5 Hiyoshi Dam retaining flood water that exceeded the SWL Hiyoshi Dam reduced the discharge of 1,540m 3 /s against the maximum inflow of 1,690m 3 /s. After that, to prevent overtopping, added discharge according to actual downstream condition. Maximum Storage EL m Reservoir Water Level (EL.m) Inflow/Discharge (m 3 /s) SWL EL.201.0m NWL in Flood season EL.178.5m Maximum Inflow applox. 1,690 m3 /s Applox. 90% Discharge 150m 3 /s Exceeded the SWL In case of within SWL ゲート天端ぎりぎりまで貯留 Maxmum Dischargeapplox.500m 3 /s 0:00 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00 21:00, 15th 2:00 4:00 6:00 8:00 10:00 12:00 9:00, 16th 14:00 16:00 18:00 20:00 22:00 0:00 21:00, 16th 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00 5

6 Operations of Seta River Barrage and Amagase Dam Seta River Barrage operated all gates closed Lake Biwa Maximum Inflow Approx.6,000m3/s Seta River Barrage Amagase Dam On Uji River The Flood Water Storage Height :1m 琵琶湖 Seta River Barrage 6

7 Coordinated Operations of Kizu River Upstream Dam Group 5 dams conducted cooperative operation to decrease the water level at the confluence point. As a result, This operation contributed to reduce 70% of Kizu River flow volume. Kyoto Uji R. Kizu R. Katsura R. 50m 3 /s NUNOME Dam 450m 3 /s TAKAYAMA Dam HINACHI Dam Osaka Bay 170m 3 /s 1,530m 3 /s 170m 3 /s 80m 3 /s 320m 3 /s MURO Dam SHORENJI Dam 320m 3 /s 170m 3 /s 500m 3 /s 7

8 Integrated Flood Control Conducted the best possible operation with all flood control facilities to lowerthewaterlevelatthe3riversconfluencepoint 3 Rivers Confluence Point Katsura River Uji River Kizu River 8

9 Flood Fighting Activities by People Water Depth of Overflow was within 20cm. This condition meets the diligent activities of Municipal Flood Fighting organization and the Self Defense Force. This water level was the Outcome of Coordinated Operation of 7dams. Flood Fighting Activities for Overflowed Embankment (Sandbags were stacked) Katsura River Activities by Municipal Flood Fighting organization Activities by the Self Defense Force 9

10 7 Dams/ 1 Barrage Coordinated Operations Contributing to Avoid Catastrophic Damage MLIT, Kinki Regional Development Bureau Instruction Information coordination JWA, KANSAI Regional Head Office coordination JWA, Kizu River Integrated Dam O/M office MLIT, Yodo River Integrated Dam Management office coordination coordination JWA, Hiyoshi Dam InstructionInformation/coordination Instruction Takayama Dam Hinachi Dam Shorenji Dam Muro Dam coordination Instruction Amagase Dam Nunome Dam Seta River Barrage 10

11 Conclusion Conclusion Coordinated and cooperative operations for flood control facilities group in short time To implement Best Possible operation with all flood control facility -Good Coordination System -Hydro meteorological data sharing system -Keep good condition of facility and equipment -Practical experiences and trainings for both decision maker and practitioner Background Photos: Control Room of Kizu River Integrated Dam O/M Office, JWA 11