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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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WATERWAYS AND BRIDGES IN TEXAS

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Waterways and bridges in texas

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/


Waterways and bridges in texas

1

3

7

10

4

2

8

11

5

9

6


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


Determined nff parameters

Determined NFF Parameters


Nff interface

NFF Interface


Flood region map

Flood Region Map


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

5

1

4

3

2


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


Questions

Questions

?


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