Download - 3 flood tools
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The Flood Threat in Colorado
By Kevin Houck, P.E., CFM
Colorado Water Conservation Board
March 2, 2011
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Hello, may I please speak with someone from Emergency Management?
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Where and When?
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Where and When?
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Where and When?
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Where and When?
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Where and When?
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Where and When?
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Where and When?
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Where and When?
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What do these have in common?
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Examples of Colorado Flood Events10’s – Cherry Creek in Denver ($161 million, 2 deaths)20’s – Arkansas River at Pueblo ($1.02 billion, 78 deaths)30’s – Monument Creek ($69 million, 18 deaths)50’s – Purgatoire River at Trinidad ($48 million, 2 deaths)60’s – South Platte River in Denver ($2.95 billion, 8 deaths)70’s – Big Thompson Canyon ($114 million, 144 deaths)80’s – Heavy Snowmelt Runoff 1984 ($63 million, 2 deaths)90’s – Fort Collins, Sterling, Lower Arkansas River ($518 million, 6 deaths)00’s – No major disasters, but damages occurred
All values are in 2010 dollars
Since 1900, the AVERAGE annual flood losses in Colorado is over $57 million. 363 lives have been lost.
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Examples of Colorado Flood EventsSince Implementation of Floodplain
Management Standards1969 South Platte River Basin ($29 million)**1970 Southwest Colorado ($18 million)**1973 South Platte River in Denver ($531 million)** #31976 Big Thompson Canyon ($116 million, 144 deaths)** #71982 Fall River/Estes Park ($67 million)**1983 North Central Counties ($36 million, 10 deaths)1984 West/Northwest Counties ($64 million)**1995 Western Slope/South Platte ($72 million, 21 deaths)1997 Fort Collins/Eastern Counties ($427 million)** #41999 Colorado Springs/Eastern Counties ($137 million)** #62000’s – No declared disasters, but estimated damages of $136 million
Notes: All values are in 2010 dollars**Denotes Presidential Disaster Declaration
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Examples of Recent Colorado Flood Events – Since Floodplain Management Implemented
Since 1910, the AVERAGE annual flood losses in Colorado is about $57 million (2010 $) . 363 lives have
been lost.
Since floodplain management implemented (1968):- 4 of 7 costliest floods in Colorado history occurred- 8 Flood Disasters (Presidential Declarations)
Source: Colorado Flood Hazard Mitigation Plan, 2010
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Flooding can be caused or exacerbated by…
Heavy rainSudden snowmeltRain on snowFailed leveesMalfunctioning stormwater systemsBreaks in canals or damsRain on burn scarsDebris flowsEtc.
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Colorado Average Annual Precipitation
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CWCB Monitors Snowpack by Basin
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Status of El Nino/La Nina can produce predictable results
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NWS March and Seasonal Forecast
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Flood Insurance is an indicator of flood risk
The following communities all have over 200 policies (in order):
BoulderDenverColorado SpringsBoulder CountyLa Plata CountyLarimer CountyArvadaEl Paso CountyJefferson CountyLakewood
Fort CollinsTellurideSteamboat SpringsSterlingAuroraWeld CountyLongmontWinter ParkArapahoe CountyVail
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Some Key Flood Points to RememberReally big floods are not that uncommon (usually at least once per decade). Most would not have been anticipated 1-2 weeks in advance even with today's forecasting skill.
Colorado snowmelt is usually well behaved.
Snowmelt floods usually require prolonged very warm temperatures and/or widespread late season snowpack including snow on south facing slopes.
Most of Colorado’s worst floods are rainfall floods.
Floods and drought are not mutually exclusive.
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Thank you!For more information, please contact:
Kevin HouckColorado Water Conservation Board(303)[email protected]**Daily Flood Threat Bulletin Begins May 1st