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Parameter Sensitivity in Hydrologic Modeling - page 3 / 163

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Table of Contents

List of Tables..........................................................................................................vi

List of Figures ......................................................................................................viii

Chapter 1: Introduction ........................................................................................... 1

    • 1.1

      Background of GIS use in Water Resources Applications ................... 2

    • 1.2

      Project History....................................................................................... 2

    • 1.3

      Objectives .............................................................................................. 3

    • 1.4

      Organization .......................................................................................... 5

Chapter 2: Literature Review .................................................................................. 6

    • 2.1

      Introduction ........................................................................................... 6

    • 2.2

      Summary of Current Hydrologic Practices of TxDOT ......................... 6

    • 2.3

      Extracting Watershed Parameters from Digital Models........................ 8

      • 2.3.1

        Digital Elevation Models ............................................................. 9

      • 2.3.2

        Triangulated Irregular Networks................................................ 11

    • 2.4

      Lumped Versus Distributed Models ................................................... 14

    • 2.5

      Scale Dependency of Hydrologic Parameters..................................... 15

    • 2.6

      Modeling Urban Areas and Future Conditions ................................... 24

Chapter 3: Methodology........................................................................................ 26

    • 3.1

      Introduction ......................................................................................... 26

    • 3.2

      Case I: Traditional Methods............................................................... 27

      • 3.2.1

        The Planimeter ........................................................................... 28

      • 3.2.2

        The Map Wheel.......................................................................... 33

      • 3.2.3

        Parameter Extraction .................................................................. 34

    • 3.3

      Case II: On-Screen Digitizing of Raster Graphic Maps.................... 34

      • 3.3.1

        Digitizing in ArcView GIS 3.2 .................................................. 37

      • 3.3.2

        Parameter Extraction.................................................................. 39 iii

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