learning from the past: lessons from a forgotten flood · - 781 square miles inundated in the...
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Learning from the Past:Lessons from aForgotten Flood
Cait Plantaric, M.A.Division of Flood ManagementCalifornia Department of Water Resources
April 16, 2015
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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
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Those who can not remember the past are condemned to repeat it. - GeorgeSantayana
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’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
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Rainfall
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Rainfall
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Rainfall
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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)
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1940 Flood Inundation
1940 Inundation
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1986 Floodways and Inundation
1940 Inundation
1986 Inundation
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1997 Floodways and Inundation
1940 Inundation
1986 Inundation
1997 Inundation
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1940 Flood Inundation Zones
1940 Inundation Zone
Levee Flood Protection Zone
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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
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1940 Flood Inundation Along Sacramento River
1940 Inundation
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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
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Questions?
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Questions?
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Questions?
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Questions?
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Questions?