i Eee 2012 Iowa Flood

7/31/2019 i Eee 2012 Iowa Flood

1/22

GIS, Imagery and Modeling to Manage 2008 Iowa FloodsMary Ann Stewart, P.E.

Mary Ann Stewart Engineering


2/22

Based on GITA ROI methodology Funded by FGDC 50 States Initiative

Complex year-long project began July 07

Business case focused on bringing 99counties to a common GIS standard

Result was a multi-agency business case

Analysis led to creation of a State agency to

provide GIS support Use of methodology $1.43M in funding to

date


3/22

Quantifying benefits presented challenges Culture ofad hocresponse

Response is priceless: We Cant Quantify It

Emergencies are unique rather than repeatable

Multi-agency response a complex web ofactivities

Standards for documentation vary by agency

Emergency response teams may disperse aftercompletion of their individual tasks


4/22

Report on the initial multi-agency analysisdue June 30, 2008

May 25 - Parkersburg tornado, flashflooding throughout Iowa

June 8 - Iowa River over 22 flood stageJune 10 - Coralville Reservoir tops

emergency spillwayJune 14 Numerous levee breaches beginJune 16 DNR project lead locked out of

State offices in Iowa City due to flooding


5/22

University of IowaBuildings

Fine Arts campusreplacement =

$404.9M (2012 est.)Total campus flooddamage > $1B


6/22

Iowa DNR project lead recommendedadditional flood/tornado response project

Funding provided by Rolla, MO USGS office

for International Charter Imagery program Analysis included use of all geospatial

technology, including Charter Imagery andother imagery products

Flood benefits updated during 2011economic development ROI analysis


7/22

Interviews with 69 individuals at 36 organizations

conducted fall 2008 spring 2009 County organizations: GIS, sheriff, emergency

management, assessor, auditor, community

development, engineering, public works, publichealth, planning and zoning State organizations: universities, DNR, Homeland

Security, State Floodplain Manager, Dept. ofAgriculture, Dept. of Transportation,

Federal organizations: Corps of Engineers, FEMA,National Weather Service, USGS Also spoke with local business owners, utilities,

response contractors


8/22

Staff time saved during emergency response

Increased FEMA assistance to citizens

Citizen time saved

Avoided cost of land-based surveying, using LiDAR Vehicle miles saved

Additional Federal damage reimbursements provided

Materials saved (primarily sandbags)

Building damage avoided

Ability to bill private entities for unneeded prevention Cost avoidance of unnecessary relocation activity


9/22

Faster information flow faster economic activity recovery Better and faster information presidential disaster declaration

Better communication with helping agencies citizens assistedbetter and faster

Better road closure information to the public time saved and

safety increased Maps and data used as communication tool for briefings

Use by EOC as situation awareness tool

Maps provide time lapse record of the stages of the flood, usefulfor hazard mitigation planning for the next flood

Better resource allocation during response

Modeling aided decision to drain basin naturally rather thanpaying to bring in big pumps

Debris removal facilitated


10/22

Coralville ReservoirSpillway


11/22

Unique confluence of staff skills enableduse of FEMA loss estimation tool

Shane Hubbard at University of IowaGeography Dept. had HAZUS background

Dave Wilson, Johnson Co. EmergencyManagement Director, sought his help

Rick Havel of Johnson Co. GIS suppliedcounty-specific data for building inventory

HAZUS results could provide daily forecastof water levels along Iowa River


12/22

Planning began June 9th with first HAZUS-MH run

in the Emergency Operations Center simulatingpeak discharges from 1993 hundred-year flood

Incorporated National Weather Service and Corpsof Engineers forecasts of discharge values forIowa River

Johnson County agencies used HAZUS output and2007 DFIRMS, plus imagery taken at flood crest

Staff now realize HAZUS runs were first stepstoward flexible flood inundation mapping


13/22

Correct placement of sandbags saved twocritical county buildings that flooded in1993

Critical building houses commissioners,auditors, assessors

Uncertainty around modeling couldntguarantee that sandbagging wasnt needed

Decision made to sandbag with flood waterultimately lapping at sandbags


14/22


15/22

Correct placement of sandbags held back3-4 feet of water from sheriffs buildings

HAZUS modeling forecasted no need toevacuate building

Building housed EOC and provided stagingsite for National Guard response

Jail housed 100 prisoners without goodoptions in event of evacuation

Evacuation by prisoner transport van wouldcost 10 trips X 4 staff X 2 hours + transportcosts


16/22

Prepositioned staff in teams of 8 come in a fewdays before the flood crest From HAZUS output, provided with a list of 600

names, addresses, phone numbers Helped prioritize work effort -- went to damaged

homes in first wave of activity saving 12 hours X 6days X 8 staff = 576 hours Knew if location was commercial, residential,

agricultural Reaching affected population sooner means

citizens can apply for assistance sooner FEMA contact noted that this had never been

provided to him working previous disasters


17/22

50 day window to apply for individual assistance afterPresidential Declaration

Citizens applying sooner FEMA customer benefitsramped up sooner

Reaching affected population sooner increase in total

applications Johnson County had 1600 registrations two months

after flood for estimated 1500-3000 buildings damaged

Typically 10% to 50% of affected citizens file

Average housing assistance payout in Iowa was $5200

Benefits could range from 50% to 90% x 1600registrations X $5200 = $4.16M to $7.49M inassistance


18/22

25% of $667M actualbuilding damages =$166,750,000

Corps provided reservoirrelease rates each morningEngineering support firmran model dailyOutput used to determine

sandbag placement


19/22

Save UI buildings $166,750,000 95.38%

Increased FEMA assistance to citizens $4,160,000 2.38%

FEMA reimbursable utility projects $3,300,000 1.89%

Productivity benefits $275,207 0.16%

All other benefits $25,122 0.01% Save UI bldgs

Increased FEMAassistance tocitizens

FEMA reimbursable

utility projects

Productivity benefits

All other benefits

95.38%


20/22

Scaling factor developed to show statewide riskfrom flooded buildings

0.13743 =

Annual Probability of 100-Year Flood *(Statewide Total Direct Economic BuildingLoss / Johnson County Total EconomicBuilding Loss)

Building Loss metrics from statewide HAZUSruns for 100 year flood in $2008


21/22


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Mary Ann Stewart, P.E.Mary Ann Stewart Engineering LLC

[email protected]

(785) 865-5251
mailto:[email protected]:[email protected]

i Eee 2012 Iowa Flood

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