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Estimating Avoided Losses
Rain Events in Harris County2016 TFMA Spring Conference
Houston, TX
Todd Ward, P.E., CFM
Brian Edmondson, P.E., CFM
Nasiha Alibegovic, EIT, CFM
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Harris County Flood Control District
A special purpose district created in 1937 by the
Texas legislature in response to floods that
devastated the Houston-area in 1929 and 1935
•Serves as a local partner to leverage federal tax
dollars for flood damage reduction
•Harris County – where we are
•Flood Control – what we do
•District – who we are
•Harris County Commissioners Court serves as
our board of directors or governing body
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Provide flood damage
reduction projects that
work, with appropriate
regard for community
and natural values.
OUR MISSION
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Flood Damage Reduction Tools Widen and deepen bayous and creeks
Excavate large stormwater detention basins
Relocate residents out of the floodplain
Flood
Damage
Reduction
Tools
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Overview
Purpose of Estimating Avoided Losses
2015 Rain Events
HCFCD Flood Reduction Projects
Tools for Estimating Avoided Losses
Due to Buyouts
• Results
Tools for Estimating Avoided Losses
Due to Projects
• Results
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Purpose of Estimating Avoided Losses
Millions spent on massive flood reduction projects
Millions spent on voluntary buyouts
• $207M for over 2,000 structures via FEMA grants – 75% Federal Share
• More than 900 other properties purchased w/ District funds
Translate these efforts into tangible numbers to
describe benefits to the communities
HCFCD USACE TOTAL
Brays Bayou $240M $240M $480M
Sims Bayou $124M $265M $389M
White Oak Bayou $54M $70M $124M
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Losses Avoided Due to Buyouts
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• Homes hopelessly deep (several feet) in floodplain
• HOUSE is the problem – NOT the stream
• Riverine flooding (bayous, creeks, and streams
coming out of banks)
Ideal Voluntary Home Buyout Properties
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Rain Events of 2015
9 PM
10 PM
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Rainfall Heat Maps
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Data and Tools Utilized
• Most Up-To Date HEC-RAS Models
(FEMA Effective or newer)
• Structural Inventory Database
• Stream Gage Network (HCFCD Flood
Warning System)
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Structural
Inventory Database
• Data is stored in a shapefile
Structures inside the
0.2% (500-year)
floodplain for
studied streams in
the County
• FF Elev.
• River Station
WSELs
• Economic Damage
Estimate
• Buyout Status
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Stream Gage
Network
142 Gages along HC
creeks, bayous and
tributaries
• Sensors transmit
rainfall depths and
water levels in real
time
• Data publicly
available ww.harriscountyfws.org
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GIS Data
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Linearly Interpolated WSE Profile
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Avoided Damages Due to Buyouts
Memorial Day 2015 Flood Event
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WSEL VS Annual Chance Relationship
Log-Linear Relationship for Determining Percent Annual Chance Flood EventFEMA’s Guidance for Flood Risk Analysis and Mapping – Flood Depth and Analysis Grids (May 2014)
Wat
er
Surf
ace
Ele
vati
on
(Li
ne
ar)
Percent Annual Chance of Flooding (Log)
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Event WSEL Profiles
• Determine peak WSEL at each stream gage
• Calculate % annual chance flood event
• Linearly interpolate % annual chance of
flooding at each XS between gages
(extrapolate U/S and D/S of most U/S and
D/S gages)
• Calculate estimated WSEL associated with
estimated annual chance of flooding at
each XS based on known frequency WSELs
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Event WSEL Profiles
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Buyout Avoided Damages Profile
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Result HighlightsOctober 24-25 October 31
Greens
Bayou
Greens
Bayou
Hunting
Bayou
Approximate
Event Frequency5 to 7-Year 10-Year
10 to 100-
Year
Estimated
Flooded Structures80 264 271
Estimated Damage $1.63M $9.57M $7.11M
Buyouts 913 913 108
Avoided
Structural Flooding48 105 29
Avoided Damage $0.63M $1.83M $1.00M
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Flood Reduction Projects
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Sims Bayou Project
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Sims Bayou Project
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Sims Bayou Project
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Sims Bayou Project
Sims Risk Map 1% Floodplain Change
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FEDERAL BRIEFING March 2015 | Washington, D.C.
White Oak Bayou Project
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Jones Rd Fairbanks-N. Houston
W. Little York Hollister Rd.
White Oak Bayou Project
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Project Brays
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Project BraysEldridge Mike Driscoll Park/ Old Westheimer
Arthur Storey Park Willow Waterhole
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Project Brays
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Over 11 “Astrodomes” of New Detention
New Channel Conveyance Longer than Loop 610
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State Hwy 288 Holcombe
Chimney Rock South Rice
Brays Bayou Channels
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Arthur Storey Park looking south
Eldridge looking east
Mike Driscoll Park/ Old Westheimer looking north
Brays Bayou Memorial Day Event
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• Record flood levels - Loop 610 to US 59
• 10% (10-yr) and 2% (50-yr) frequency range
Peak: 52.2 ft
Low Houses Finish Floor
Gage Reading At South Rice
Str
ea
m E
leva
tio
n (
ft)
Time (Latest Reading: Wednesday, May 27, 2015 6:49 AM)
Brays Bayou Memorial Day Event
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Event Date HWM
Allison (2001) 45.5’
05/26/15 40.2’
03/04/92 40.1’
Frances (1998) 37.6’
Ike (2008) 36.3’
Str
ea
m E
leva
tio
n (
ft)
Time (Latest Reading: Wednesday, May 27, 2015 6:49 AM)
Gage Reading At Heights Boulevard
Peak: 38.1 ft
• Downtown to Heights – just above 10-Year
White Oak Bayou Memorial Day Event
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I-45 & N. Main
Heights Blvd
White Oak Bayou Memorial Day Event
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Areas of Concentrated House Flooding
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Property Damage
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Losses Avoided Due to Projects
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Available Data
• Gage Rainfall (HCFWS)
• Stream Water Surface Elevations
• Surveyed High Water Marks
• FEMA Effective Models and Profiles
• Updated Models and Profiles
• 2008 1-foot LiDAR
• Building Footprints with FF Elev.
• Rainfall Heat Maps
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• Approximate Method
• Gaged Floodplain VS Effective
Combination Floodplain
• Constructed components of Project
Brays are indirectly included in the
analysis for the Gaged Floodplain
Modeling Method I
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Method I Results
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Modeling Method II
• HWM Floodplain VS Modeled Event
Floodplain
• Used over 40 surveyed HWM
• HWM Floodplain was field-verified
• May 25th Rainfall was modeled in
HEC-HMS and HEC-RAS using effective
models to estimate potential flood damage
pre-Project Brays
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Gage Rainfall
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Radar Rainfall
• NEXRAD Digital Precipitation Array (DPA)
• One-hour increments
• May 25 11:00 PM to May 26 2:00 PM
• Standard reflectivity-rainfall relationship
𝐙 = 𝟑𝟎𝟎𝐑𝑟𝑎𝑑𝑎𝑟𝟏.𝟒
• Calibration of radar data based on trend
between radar reflectivity values and hourly
rainfall totals at each gauge
𝐙 = 𝟐𝟒𝟗𝐑𝑟𝑎𝑑𝑎𝑟𝟏.𝟑
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Radar Rainfall
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Method II Stream Profiles
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Method II Results
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Sims Bayou Profiles
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Sims Bayou Results
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White Oak Bayou Profiles
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White Oak Bayou Results
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White Oak Bayou Results
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Avoided Damages Due to Projects
May 25 October 25 October 31
Brays Bayou 7,300 210 210
Sims Bayou 1,700 --- 1,700
White Oak Bayou 1,600 350 350
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QUESTIONS