UTRCA UTRCA Flood Damage AssessmentFlood Damage Assessment

Mark Mark HelstenHelsten-- Senior Water Resources EngineerSenior Water Resources Engineer

Drew Drew DavidgeDavidge-- Water Resource Technician Water Resource Technician

Matt WoodMatt Wood-- Project EngineerProject Engineer

Philip Philip SimmSimm-- GIS TechnicianGIS Technician

Wednesday, June 8, 2005

OutlineOutlineHECHEC--FDA OverviewFDA Overview

About HECAbout HEC--FDAFDA

Depth Damage CurvesDepth Damage Curves

Hydraulic ModelingHydraulic Modeling

Study AreasStudy Areas

Damage ReachesDamage Reaches

Structures Data BaseStructures Data Base

Running HECRunning HEC-- FDAFDA

Progress UpdateProgress Update

HECHEC--FDAFDAHECHEC--FDA v.1.2FDA v.1.2

Developed by HEC (USACE)Developed by HEC (USACE)

Windows BasedWindows Based

Compatible with HECCompatible with HEC--RAS outputRAS output

Contains FEMA style risk based analysis procedures Contains FEMA style risk based analysis procedures for evaluating past and future damage reduction for evaluating past and future damage reduction measuresmeasures

FDA Program Information RequirementsFDA Program Information Requirements

Study Area & Damage ReachesStudy Area & Damage Reaches

Hydraulic Information: Stage Discharge FunctionsHydraulic Information: Stage Discharge Functions

Economic Data: Structure Inventory, Damage curvesEconomic Data: Structure Inventory, Damage curves

Structure Depth Damage Structure Depth Damage CurvesCurves

Unique to Structure useUnique to Structure use

Direct Depth Damage curves from MNRDirect Depth Damage curves from MNR

““Flood Estimation GuideFlood Estimation Guide”” Ministry of Natural Ministry of Natural Resources, 1989Resources, 1989

Converted to DepthConverted to Depth--Percent Damage CurvesPercent Damage Curves

Depth-Percent Damage Curves

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0 0.5 1 1.5 2 2.5 3 3.5

Depth of Flooding (m)

Perc

ent o

f Max

. Dam

age

Depth Damage Curves

0

500

1000

1500

2000

0 2 4 6 8 10 12

Depth (ft)

Dam

age

($/ft

^2)

General Office

MedicalShoes

ClothingStereo/TV

HydrualicHydrualic ModelingModeling

HECHEC--RASRAS

Used Existing Models of Used Existing Models of Watershed and InterpolatedWatershed and Interpolated

FlowFlow--Stage data for 2, 5, 10, 25, Stage data for 2, 5, 10, 25, 50, 100, 250 and 500 year 50, 100, 250 and 500 year return periodsreturn periods

Used XUsed X--section Data:section Data:

Plotted approximate 500 year Plotted approximate 500 year flood line to determine study flood line to determine study boundariesboundaries

Structure IdentificationStructure Identification

Damage Points Mapped with GISDamage Points Mapped with GIS

Within 500 year flood Within 500 year flood approximationapproximation

Each point represents one Each point represents one structurestructure

Plotted for all existing HECPlotted for all existing HEC--RAS RAS modelsmodels

Helped Determine Damage Helped Determine Damage Reaches and Study AreasReaches and Study Areas

Study AreasStudy AreasUTRCA watershed Major Damage CentersUTRCA watershed Major Damage Centers

St. MarySt. Mary’’ss

LondonLondon

MitchellMitchell

WoodstockWoodstock

IngersollIngersoll

StratfordStratford

Damage ReachesDamage Reaches

Spatial Floodplain AreasSpatial Floodplain Areas

Kept constant throughoutKept constant throughout

Boundaries Based on;Boundaries Based on;Constant Discharge AreasConstant Discharge Areas

Location of flood Reduction MeasuresLocation of flood Reduction Measures

Past Study Boundaries Past Study Boundaries

Municipal BoundariesMunicipal Boundaries

Etc.Etc.

Output Damage Curves Divided into ReachesOutput Damage Curves Divided into Reaches

St. MarySt. Mary’’s FDA Maps FDA Map

Structures Data BaseStructures Data BaseBuild a structures database for each study areaBuild a structures database for each study area

Done in Access for mobility and future editingDone in Access for mobility and future editing

Municipal info.Municipal info.-- GIS filesGIS files

Hydrological LocationHydrological LocationRiver StationRiver Station

Stream NameStream Name

Structure ClassificationStructure ClassificationCategory Category

Occupancy TypeOccupancy Type

Elevation DataElevation DataGIS/DEM generated lowest ground elevationGIS/DEM generated lowest ground elevation

Surveyed Data (where available)Surveyed Data (where available)

Windshield surveyWindshield survey

Running HECRunning HEC--FDAFDAStudy InformationStudy Information

Inflation Index, Study Year, Study DescriptionInflation Index, Study Year, Study Description

Enter Study Streams and Damage ReachesEnter Study Streams and Damage Reaches

Import Economic DataImport Economic DataOccupancy Type Damage CurvesOccupancy Type Damage Curves

Structures Data BaseStructures Data Base

Compute Reach Stage Damage FunctionsCompute Reach Stage Damage Functions

Analyze output results to check for errorsAnalyze output results to check for errors

Compute Reach Stage Damage Functions againCompute Reach Stage Damage Functions again

OutputOutput

Models CompletedModels CompletedAll Study AreaAll Study Area

Hydrologic ModelsHydrologic ModelsStructures identification modeling completeStructures identification modeling completeStudy Areas DeterminedStudy Areas Determined

HECHEC--FDAFDAMitchellMitchellSt. MarySt. Mary’’s s LondonLondon--West London area near completionWest London area near completion

Work to Be doneWork to Be doneStratfordStratfordIngersollIngersollWoodstockWoodstockLess Significant Damage AreasLess Significant Damage Areas

Questions?Questions?