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Rosillo Creek Flood monitoring and mapping in
San Antonio-Texas, an Emergency Management point
of view Part II(and what can we do about
this for Onion Creek in Austin?)Rodrigo Nicolau

• TERM PROJECT CE 394K GIS for Water Resources

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Model Integration Framework for Floodplain
Mapping of Rosillo Creek

• Starting where Silvana stopped
• The results obtained by the analysis and
  utilization of times series
• Average depth
• Accumulated volume
• ?Model system (all integrated)
• NEXRAD, Rainfall data
• Geospatial Data City, county, SARA, others
• Calibration Data
• Allows floodplain management, flood forecasting,
  Capital improvement planning

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Model Integration Framework for Floodplain
Mapping of Rosillo Creek

• Model framework for Floodplain Mapping of Salado
  Creek
• (CRWR research project by Oscar Robayo
  and Prof. David Maidment)
• Represent multi model and GIS integration of
  the hydrologic and hydraulic components of the
  San Antonio Basin Modeling Project
• Rosillo Creek as part of Salado Creek
• GIS
• Integrates graphic data and variety of info from
  databases
• Management and display of info ? geo-referenced
  framework
• Share of input/output data possible between
  different software/model (HH)
• Rosillo Creek
• Spatial linkages
• Stream networks, Water features ? Hydraulic
  Hydrologic models
• ArcHydro ? Allows HEC-RAS and HEC-HMS to interact

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Model Integration Framework for Floodplain
Mapping of Rosillo Creek

• Key for success is the correct transfer of time
  series
• HEC DSS Hydrologic Engineering Center Data
  Storage System
• HEC-RAS and HEC-HMS use this DSS to run/work

GEODATABASE
HEC-DSS
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Model Integration Framework for Floodplain
Mapping of Rosillo Creek

• Reading Precipitation
• NEXRAD supplies the rainfall data as text files
• Text files are read time series are transferred
  to Geodatabases tables with ArcHydro format HEC
  time series type
• Mapping to Watersheds
• Time series records assoc. to NEXRAD are map to
  the watershed ? hyetography
• HEC-HMS develops rainfall-runoff transformations
  ? estimating avg rainfall over watershed
• Transferring info to HEC-DSS
• The precipitation records (avg rainfall over
  watershed) is transferred to HEC DSS binary
  format
• HEC-HMS executing
• Using DSS stored info HEC-HMS is done through
  batch files ? FLOWS
• Final steps
• HEC-HMS Flow discharges are transferred to
  Geodatabase here HEC-RAS runs ? obtain water
  surface elevation
• Elevations are associate to cross sections ?
  interpolating ? water surface TIN ? to raster
  format ? intersect with terrain raster ? water
  depth convert to polygon format ? GENERATE FLOOD
  INUNDATION MAP

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NEXRAD

• NEXRAD stands for Next Generation Weather Radar
• NEXRAD is also known as the WSR-88D (Weather
  Surveillance Radar 1988 Doppler)
• used to warn the people about dangerous weather
  and its location
• 158 operational NEXRAD radar systems deployed
  throughout the United States and at selected
  overseas locations
• Improves management and surveillance in severe
  weather and flash flood warnings, air traffic
  safety, flow control for air traffic and others
• Main characteristic is ability to detect wind
  patterns in storms and provide real time rainfall
  amounts
• Accurate detection of circulations associated
  with tornadoes and other severe weather phenomena
  increase advance warning helping save lives and
  protect property

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NEXRAD

• How it works
• Radar sends signal and processes the reflected
  ones determining location and intensity of
  precipitation and the wind speeds toward and away
  from the radar site
• computer systems, which create easy to read color
  displays of the NEXRAD information for each
  individual radar, and combine information from
  all radars to create mosaic displays

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Nexrad Map to Flood Map in Model Builder
Flood map as output
Model for flood flow
HMS
Model for flood depth
Nexrad map as input
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NEXRAD

• The flood inundation polygons correspond to the
  following storm events
• FloodPoly1 01 Jul 2002 at 0400 through 01 Jul
  2002 at 2400
• FloodPoly2 14 Jul 2002 at 1700 through 15 Jul
  2002 at 1400

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Rosillo Creek NEXRAD Output

• COSA
• Ortophotos
• Stream line
• City Streets/highways
• Rosillo watershed

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• Zoom to floodpoly1

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Zoom to floodpoly2
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Conclusions and recommendations

• The model proves to be valuable even at this
  early state
• It shows differences compared to 100 year
  floodplain map
• Amount of rainfall and flow changed after 1998
  floods (???)
• From emergency point of view
• NEXRAD and GIS tools/software applied to flood
  management can be crucial
• Early warning ? evacuation, emergency response
  teams guidance
• E911 and new and improved communication systems
  allow relay of info to emergency units responding
  to floods
• Improve efficiency in response ? routing (avoid
  slide background situations)
• If implemented it will probably change SOP
  specifically Fire response

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FUTURE WORK

• and what can we do about this for Onion Creek in
  Austin?
• Flood mapping for Onion Creek
• Recommendations to emergency response to floods
  according to mapping
• Implement NEXRAD Map to FLOOD Map model by Austin
  OEM (???)

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ACKNOWLEDGEMENTS

• Professor David Maidment, UT
• Oscar Robayo, UT
• Ross Clark, COA Watershed Protection
  Development Review Department
• Christine Thies, Austin Fire Department
  GIS-Planning Office