Onion Creek Flooding, 30 October 2013

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Presentation transcript:

Onion Creek Flooding, 30 October 2013 Number of buyouts by the City of Austin in the Onion Creek area – 323 homes Approximate amount spent on buyouts - $36 million ($8M of this from FEMA grant funding) A flooded home location

FEMA Flood Hazard Zone

Drainage Area above Home Drainage area = 732 km2, or 282 miles2

Flood Water Elevations Halloween Flood on Onion Creek Expected Hurricane Storm Surge Heights on Gulf Coast

Halloween Flood ~ 120,000 cfs Somewhere between 20 yr and 100 yr return period, perhaps 50 yrs Halloween Flood HEC-SSP Flood Frequency Analysis full flood record

http://crhphotos.com/2013/10/halloween-2013-flood/