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Parameter Sensitivity in Hydrologic Modeling - page 5 / 163

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5 / 163

        • 5.2.1.2

          Slope .......................................................................... 102

        • 5.2.1.3

          Curve Number........................................................... 103

        • 5.2.1.4

          Step 1 Results........................................................... 105

      • 5.2.2

        Step 2: Sensitivity of Flow to Variations in Lag Time ........... 106

        • 5.2.2.1

          HEC-1 Model ............................................................ 108

        • 5.2.2.2

          Lag Time Variation ................................................... 112

        • 5.2.2.3

          Drainage Area Variation ........................................... 115

        • 5.2.2.4

          Step 2 Results ............................................................ 118

      • 5.2.3

        Results from Elasticity Analysis .............................................. 119

Chapter 6: Conclusions and Recommendations.................................................. 124

    • 6.1

      Errors Sources Among Parameter Extraction Methods .................... 125

      • 6.1.1

        Parameter Extraction using Paper Maps .................................. 125

      • 6.1.2

        On-Screen Digitizing of Raster Graphic Maps ........................ 126

      • 6.1.3

        Parameter Extraction Using Automated Methods.................... 127

      • 6.1.4

        Parameter Extraction Using TINs ............................................ 128

    • 6.2

      Errors Among Extracted Hydrologic Parameters.............................. 129

      • 6.2.1

        Drainage Area .......................................................................... 129

      • 6.2.2

        Slope......................................................................................... 129

      • 6.2.3

        Longest Flow Path.................................................................... 130

      • 6.2.4

        Perimeter .................................................................................. 130

      • 6.2.5

        Curve Number.......................................................................... 130

    • 6.3

      Significance of Errors........................................................................ 131

    • 6.4

      Additional Sources of Error .............................................................. 134

    • 6.5

      Recommendations ............................................................................. 135

Appendix A: Online Internet Resources ............................................................ 137

Appendix B: Unmodified HEC-1 Model ........................................................... 138

Appendix C: Modified HEC-1 Model in HEC-HMS......................................... 141

Bibliography ........................................................................................................ 150 v

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