onion creek flooding, 30 october 2013
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/1.jpg)
Onion Creek Flooding, 30 October 2013
Number of buyouts by the City of Austin in the Onion Creek area – 323 homesApproximate amount spent on buyouts - $36 million ($8M of this from FEMA grant funding)
A flooded home location
![Page 2: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/2.jpg)
FEMA Flood Hazard Zone
![Page 3: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/3.jpg)
Drainage Area above HomeDrainage area = 732 km2, or 282 miles2
![Page 4: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/4.jpg)
Variation in SLOSH Model Storm Surge Elevations at Developed Shoreline
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
Shoreline Locations - Not to scaleSt
orm
Sur
ge E
leva
tion
(ft m
sl)
Cat 5Cat 3Cat 1
PRELIMINARYsource: FEMA MAT, 2-26-06
Flood Water Elevations
Halloween Flood on Onion Creek Expected Hurricane Storm Surge Heights on Gulf Coast
![Page 5: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/5.jpg)
Halloween Flood ~ 120,000 cfs
Somewhere between 20 yr and 100 yrreturn period, perhaps 50 yrs
Halloween Flood
HEC-SSP Flood Frequency Analysisfull flood record
![Page 6: Onion Creek Flooding, 30 October 2013](https://reader035.vdocuments.us/reader035/viewer/2022062810/56815b60550346895dc9458a/html5/thumbnails/6.jpg)
http://crhphotos.com/2013/10/halloween-2013-flood/