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Learning from the Past: Lessons from a Forgotten Flood Cait Plantaric, M.A. Division of Flood Management California Department of Water Resources April 16, 2015

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Page 1: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Learning from the Past:Lessons from aForgotten Flood

Cait Plantaric, M.A.Division of Flood ManagementCalifornia Department of Water Resources

April 16, 2015

Page 2: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Today’s Discussion

What We “Know”– You may be surprised

The Story of 1940– How it compares to…

Why It Matters Now– Thinking about and planning for the future

Page 3: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Those who can not remember the past are condemned to repeat it. - GeorgeSantayana

Page 4: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Page 5: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

’40 ’86 ‘97Similarities:- Warm storms- Lots of precipitation- Ground already

saturatedDifferences:- Pre-reservoirs- Storm lasted four days- Storm was a mix of both tropical and artic patterns- Storm impacted Eel, Russian, Napa, Sacramento,

Yuba-Feather and American River basins – almostno impact in the Delta or San Joaquin Valley

- Approximately 35 levee breaks- The flooding scenario repeated itself one month later

on a smaller scale

Page 6: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Rainfall

Page 7: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Rainfall

Page 8: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Rainfall

Page 9: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1940 Costs

- 10 deaths

- 781 square miles inundated in the Central Valley

- Total damage estimate $268M ($16M 1940)

- Damage estimate for nine counties on SacramentoRiver - $223 M ($13.3M 1940)

- Transportation infrastructure - $21.26M ($1.267M 1940)

Page 10: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1940 Flood Inundation

1940 Inundation

Page 11: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1986 Floodways and Inundation

1940 Inundation

1986 Inundation

Page 12: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1997 Floodways and Inundation

1940 Inundation

1986 Inundation

1997 Inundation

Page 13: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1940 Flood Inundation Zones

1940 Inundation Zone

Levee Flood Protection Zone

Page 14: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

What’s at Risk?

- 373,313 – 1940 population of nine Sacramento Rivercounties

- 2,638,641 – 2010 population of nine Sacramento Rivercounties

- Sacramento International Airport – completed 1967

- Interstate 5 – completed 1960s–1970s

- Interstate 80 – completed 1970s

Page 15: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1940 Flood Inundation Along Sacramento River

1940 Inundation

Page 16: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

1940 Flood Inundation Zones

1940 Inundation Zone

Davis –65,622

Woodland –55,468

Butte County –222,000

Sacramento –466,488

Solano County –413,344Note: 2010 population

numbers

Page 17: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Questions?

Page 18: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Questions?

Page 19: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Questions?

Page 20: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Questions?

Page 21: Learning from the Past: Lessons from a Forgotten Flood · - 781 square miles inundated in the Central Valley - Total damage estimate $268M ($16M 1940) - Damage estimate for nine counties

Questions?

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