the development of a flood warning and response system³n on... · the development of a flood...
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Hydrologic Engineering Center 1
The Development of aFlood Warning and Response System
Cameron Ackerman, P.E. Hydrologic Engineering Center, USACE
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Purpose
Provide a Flood Warning and Response System to communities along river systems
Maximize response time (County Emergency Management Agency and Floodplain Residents)Use stage/elevation-based flood inundation mappingDamage estimates (expedite disaster assistance)Evacuation & flood warning plan formulation toolEducate the public on flood hazard
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Software Development Goals
Use existing technologies as much as possible to develop the FWRSDevelop new tools and interfaces only where necessaryMaximize the use of geospatial displaysKeep the interface simple and customizableEasily update data
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Process Components
Forecast InformationNational Weather Service Forecasts
River Hydraulics ModelRiver Analysis System (HEC-RAS), HEC-GeoRAS
Data VisualizationArcGIS – Customized Interface, Excel
Flood Damage ComputationsStructure Inventory
Flood Impact Response Tables
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Study Area – Susquehanna River
4 NWS Forecast Locations
Pennsylvania
Sunbury
Danville Bloomsburg
Wilkes-Barre
Northumberland County
Montour County
Columbia County Luzerne
County
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HEC-RAS Model Creation and Calibration
0 100000 200000 300000 400000 500000350
400
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500
550
600
650
Susquehanna River Model 1972 Historic Flood Calibration
Main Channel Distance (ft)
Ele
vatio
n (ft
)
Legend
WS 500 Year
WS 100 Year
WS 25 Year
WS 5 Year
WS 2 Year
Ground
OWS 2 Year
OWS 5 Year
OWS 25 Year
OWS 100 Year
OWS 500 Year
Sea
lhol
tz R
un
Sun
bury
Gag
e
Lith
ia S
prin
gs
Gra
vel R
un
Kip
ps R
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ahon
ing
Cre
ek
Loga
n R
unLi
ttle
Roa
ring
Roa
ring
Cre
ek
Cat
awis
sa C
reek
Fish
ing
Cre
ek
Blo
omsb
urg
Gag
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Tenm
ile R
un
Bria
r Cre
ek
Nes
cope
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reek
Wap
wal
lope
n C
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Wap
wal
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Shi
cksh
inny
Cre
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Hun
lock
Cre
ek
Har
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Cre
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atik
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Cre
ek
Toby
Cre
ekW
ilkes
-Bar
re G
ag
Abr
ahm
s C
reek
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Inundation Mapping using HEC-GeoRAS
Atlas of water surface profiles/inundation maps run to cover the range of expected events
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Flood Warning and Response System
Customized interface to ArcGIS
Entry of forecast informationQuery of inundation depthsAccess impact response tablesCalculate structure damages
Zoom Locations Response Tables
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Forecast Entry – Susquehanna River
Predefined Locations for entry of Elevation or Stage
Wilkes-Barre
Bloomsburg
Danville
Sunbury
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Forecast Entry – San Antonio River
Flexible “selection” of input locations
FWRS input form is built based on Excel sheet
117.7 < Elev. < 147.5
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Tiled Mapping
Interpolation by profile number
Backwater by water surface elevation at confluences to handle tributaries
Data stored by profile
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Flood Impact Response Tables
Given a forecasted elevation:What is the expected impact?What response action should be taken?
Developed by individual local Emergency Management Agencies
Excel spreadsheetMay be formatted (font, color, size)
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Flood Damage Analysis
Structure inventoryDepth-%Damage curves
Damage Category (Susquehanna River)Residential, commercial, ...
Occupancy type (San Antonio River)Single Story Residential, 2 Story Residential, Mobile Home, Single Story Apartment, …
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Structure Damage
Query inundation depthCompute individual structure damage
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Contact Information
Cameron Ackerman, P.E.Hydrologic Engineering Center, [email protected]