Download - WATERWAYS AND BRIDGES IN TEXAS
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WATERWAYS AND BRIDGES IN TEXAS
“Final” Presentation by:Brandon Klenzendorf
CE 394K11-22-05
Dr. Maidment
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BackgroundBackground
►TxDOT to use crash-tested bridge railsTxDOT to use crash-tested bridge rails►May impact FEMA 100-year floodplainsMay impact FEMA 100-year floodplains►Cause for map revisions – time and money!Cause for map revisions – time and money!►Need to determine how bridge rails affect water Need to determine how bridge rails affect water
surface profilessurface profiles
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TxDOT Design FrequenciesTxDOT Design Frequencies
TxDOT Hydraulic Design Manual
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Project PurposeProject Purpose
►In order to solve this problem, we need to In order to solve this problem, we need to predict…predict… Hydraulic impact of crash-tested bridge railsHydraulic impact of crash-tested bridge rails 100-year peak flood discharges100-year peak flood discharges
►Determine peak discharge for 100-year return Determine peak discharge for 100-year return period floodperiod flood
►Use GIS and NFF programs to gain info on Use GIS and NFF programs to gain info on flood dischargesflood discharges
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GIS Data CollectionGIS Data Collection
►State of Texas HUCs from TNRISState of Texas HUCs from TNRIS http://www.tnris.state.tx.us/http://www.tnris.state.tx.us/
►Major highway network from TNRISMajor highway network from TNRIS►Major stream network from TNRISMajor stream network from TNRIS►DEMs for selected bridges from USGSDEMs for selected bridges from USGS
http://seamless.usgs.gov/http://seamless.usgs.gov/
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ArcHydro ToolsArcHydro Tools
►DEM processingDEM processing Problems with gaps in stream layerProblems with gaps in stream layer
►Drainage line creationDrainage line creation►Batch point watershed delineationBatch point watershed delineation►Longest upstream lengthLongest upstream length►Upstream and downstream elevationsUpstream and downstream elevations
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Bridge 1Bridge 1
Problems!
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USGS NFF ProgramUSGS NFF Program
►National Flood Frequency ProgramNational Flood Frequency Program►Estimates the magnitude and frequency of flood Estimates the magnitude and frequency of flood
peak discharges and hydrographspeak discharges and hydrographs 2, 5, 10, 25, 50, 100, and 500-year frequency floods2, 5, 10, 25, 50, 100, and 500-year frequency floods
►Uses Visual Basic and regression equations Uses Visual Basic and regression equations specific for each statespecific for each state
►FREE!!!FREE!!!►http://water.usgs.gov/software/nff.htmlhttp://water.usgs.gov/software/nff.html
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NFF Program ParametersNFF Program Parameters
►Drainage Area (A) – area (miDrainage Area (A) – area (mi22) contributing to ) contributing to flow at the bridgeflow at the bridge
►Shape Factor (SH) – ratio of stream length Shape Factor (SH) – ratio of stream length squared (misquared (mi22) to drainage area (mi) to drainage area (mi22)) Represents stream length to average widthRepresents stream length to average width
►Stream Slope (SL) – change in elevation (ft) Stream Slope (SL) – change in elevation (ft) divided by steam length (mi)divided by steam length (mi)
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Hydrologic RegionsHydrologic Regions
► Determined based on Determined based on physiography and physiography and climatic conditionsclimatic conditions
► Each hydrologic region Each hydrologic region has range of applicable has range of applicable parametersparameters
► Hydrologic Region 1 - Hydrologic Region 1 - QQ100100=371A=371A0.8470.847SHSH-0.307-0.307
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Determined NFF ParametersDetermined NFF ParametersHydrologic Hydrologic
RegionRegionAreaArea
(mi(mi22))
UpstreamUpstream
Length (mi)Length (mi)
SlopeSlope
(ft/mi)(ft/mi)
Shape Shape FactorFactor
LatitudeLatitude
(DD)(DD)
LongitudeLongitude
(DD)(DD)
R-1R-1 1120.91120.9 29.1229.12 9.859.85 0.7560.756 36.20236.202 -101.306-101.306
R-2R-2 548.4548.4 17.1617.16 37.6237.62 0.5370.537 31.87831.878 -103.947-103.947
R-3R-3 3408.13408.1 45.5345.53 13.2413.24 0.6080.608 34.09034.090 -99.730-99.730
R-4R-4 2098.02098.0 40.1940.19 7.777.77 0.7700.770 32.39932.399 -100.894-100.894
R-5R-5 1447.01447.0 43.0443.04 11.6611.66 1.2801.280 29.51429.514 -97.494-97.494
R-6R-6 489.2489.2 27.96627.966 -98.973-98.973
R-7R-7 1917.41917.4 33.07233.072 -97.532-97.532
R-8R-8 2590.92590.9 31.43531.435 -97.759-97.759
R-9R-9 571.0571.0 28.70328.703 -97.047-97.047
R-10R-10 991.2991.2 32.77732.777 -95.798-95.798
R-11R-11 923.2923.2 30.39630.396 -94.255-94.255
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NFF InterfaceNFF Interface
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Flood Region MapFlood Region Map
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NFF ResultsNFF Results
► 100-year hydrograph for 100-year hydrograph for five bridgesfive bridges
► Bridge 5 has largest Bridge 5 has largest peak, but third largest peak, but third largest areaarea
► Bridge 3 has second Bridge 3 has second lowest peak, but largest lowest peak, but largest areaarea
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Completed WorkCompleted Work
►Geodatabase of Texas rivers, Geodatabase of Texas rivers, highways, and HUCshighways, and HUCs
►ArcHydro tools for all bridgesArcHydro tools for all bridges►Batch point watershed delineation for Batch point watershed delineation for
all bridgesall bridges►Partial completion of longest stream Partial completion of longest stream
lengthlength►Partial completion of NFF analysisPartial completion of NFF analysis
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Future WorkFuture Work
►Longest stream lengths for remaining Longest stream lengths for remaining Hydrologic RegionsHydrologic Regions
►NFF analysis for all bridgesNFF analysis for all bridges►Comparison of resultsComparison of results►Analyze errors in DEMs, HUCs, and bridge Analyze errors in DEMs, HUCs, and bridge
locationslocations►Write final reportWrite final report
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QuestionsQuestions
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