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WATERWAYS AND BRIDGES IN TEXAS

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WATERWAYS AND BRIDGES IN TEXAS. CE 394K 11-22-05 Dr. Maidment. “Final” Presentation by: Brandon Klenzendorf. Background. TxDOT to use crash-tested bridge rails May impact FEMA 100-year floodplains Cause for map revisions – time and money!

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Presentation Transcript
slide1

WATERWAYS AND

BRIDGES IN TEXAS

CE 394K

11-22-05

Dr. Maidment

“Final” Presentation by:

Brandon Klenzendorf

background
Background
  • TxDOT to use crash-tested bridge rails
  • May impact FEMA 100-year floodplains
  • Cause for map revisions – time and money!
  • Need to determine how bridge rails affect water surface profiles
txdot design frequencies
TxDOT Design Frequencies

TxDOT Hydraulic Design Manual

project purpose
Project Purpose
  • In order to solve this problem, we need to predict…
    • Hydraulic impact of crash-tested bridge rails
    • 100-year peak flood discharges
  • Determine peak discharge for 100-year return period flood
  • Use GIS and NFF programs to gain info on flood discharges
gis data collection
GIS Data Collection
  • State of Texas HUCs from TNRIS
    • http://www.tnris.state.tx.us/
  • Major highway network from TNRIS
  • Major stream network from TNRIS
  • DEMs for selected bridges from USGS
    • http://seamless.usgs.gov/
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archydro tools
ArcHydro Tools
  • DEM processing
    • Problems with gaps in stream layer
  • Drainage line creation
  • Batch point watershed delineation
  • Longest upstream length
  • Upstream and downstream elevations
bridge 1
Bridge 1

Problems!

usgs nff program
USGS NFF Program
  • National Flood Frequency Program
  • Estimates the magnitude and frequency of flood peak discharges and hydrographs
    • 2, 5, 10, 25, 50, 100, and 500-year frequency floods
  • Uses Visual Basic and regression equations specific for each state
  • FREE!!!
  • http://water.usgs.gov/software/nff.html
nff program parameters
NFF Program Parameters
  • Drainage Area (A) – area (mi2) contributing to flow at the bridge
  • Shape Factor (SH) – ratio of stream length squared (mi2) to drainage area (mi2)
    • Represents stream length to average width
  • Stream Slope (SL) – change in elevation (ft) divided by steam length (mi)
hydrologic regions
Hydrologic Regions
  • Determined based on physiography and climatic conditions
  • Each hydrologic region has range of applicable parameters
  • Hydrologic Region 1 - Q100=371A0.847SH-0.307
nff results
NFF Results
  • 100-year hydrograph for five bridges
  • Bridge 5 has largest peak, but third largest area
  • Bridge 3 has second lowest peak, but largest area

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completed work
Completed Work
  • Geodatabase of Texas rivers, highways, and HUCs
  • ArcHydro tools for all bridges
  • Batch point watershed delineation for all bridges
  • Partial completion of longest stream length
  • Partial completion of NFF analysis
future work
Future Work
  • Longest stream lengths for remaining Hydrologic Regions
  • NFF analysis for all bridges
  • Comparison of results
  • Analyze errors in DEMs, HUCs, and bridge locations
  • Write final report
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