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Parameter Sensitivity in Hydrologic Modeling - page 134 / 163

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Chapter 6: Conclusions and Recommendations

This implementation project was conducted to provide guidance to TxDOT regarding parameter sensitivity in hydrologic modeling. The principal factors affecting flood magnitudes in a watershed include runoff, and watershed area information such as slope, flow path length, area, land use, and soil type. These parameters are all important in determining the peak discharge at a watershed outlet such as a culvert or bridge crossing. Currently TxDOT predominantly uses traditional methods of hand delineation to extract hydrologic parameters, although TxDOT is moving towards using more automated methods for this process.

The use of GIS in water resources engineering has proved to be aquick and relatively simple means of computing hydrologic data. In 2000, however, Anderson (2000) conducted a digital floodplain analysis for TxDOT which led to doubts about the automated process. Anderson’s watershed lag time values were

significantly

greater

than values

TxDOT. In

an effort

to determine

found in an earlier possible causes of this

analysis conducted by error, four case studies

were

developed

paper

maps; (2)

to analyze on-screen

three areas of different size: extraction from raster maps;

  • (1)

    measurement from

  • (3)

    using GIS and two

different resolutions of grid-based a triangulated irregular network conclusions and recommendations

digital elevation models (DEMs); and (4) using

(TIN).

This

section

of

the

report

discusses

as

drawn

from

the

implementation

study.

124

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