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Parameter Sensitivity in Hydrologic Modeling - page 4 / 163

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    • 3.4

      Case III: Automated Methods using a DEM...................................... 40

      • 3.4.1

        Overview of Automated Methods using a DEM........................ 41

      • 3.4.2

        ArcView GIS 3.2........................................................................ 45

        • 3.4.2.1

          CRWR-PrePro............................................................. 46

        • 3.4.2.2

          Parameter Extraction using ArcGIS and CRWR- PrePro ................................................................................ 49

      • 3.4.3

        Watershed Modeling System (WMS) ........................................ 51

        • 3.4.3.1

          TOPAZ ........................................................................ 54

        • 3.4.3.2

          Parameter Extraction................................................... 55

    • 3.5

      Case IV: Automated Methods using a TIN........................................ 57

      • 3.5.1

        TIN Development and Processing.............................................. 58

      • 3.5.2

        TIN Parameter Extraction .......................................................... 60

Chapter 4: Application .......................................................................................... 61

    • 4.1

      Site Selection....................................................................................... 61

    • 4.2

      Case I: Traditional Methods............................................................... 64

    • 4.3

      Case II: Automated Methods by Digitizing ....................................... 67

    • 4.4

      Case III: Automated Methods Using a DEM ..................................... 70

      • 4.4.1

        ArcView GIS 3.2 and CRWR-PrePro ........................................ 71

        • 4.4.1.1

          10 Meter DEM ............................................................ 75

        • 4.4.1.2

          30 Meter DEM ............................................................ 76

      • 4.4.2

        Automated Methods Using WMS .............................................. 78

        • 4.4.2.1

          10 Meter DEM ............................................................ 78

        • 4.4.2.2

          30 Meter DEM ............................................................ 81

    • 4.5

      Case IV: Automated Methods Using a TIN........................................ 84

Chapter 5: Results ................................................................................................. 89

    • 5.1.

      Case Study Parameter Results Summary ............................................ 89

    • 5.2

      Elasticity Analysis............................................................................... 95

      • 5.2.1

        Step 1: Sensitivity of SCS Lag Time to Parameter Variations . 98

        • 5.2.1.1

          Longest Flow Path....................................................... 99 iv

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