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Parameter Sensitivity in Hydrologic Modeling - page 100 / 163

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Methods used to extract the watershed parameters (as discussed in detail in Chapter 4) include (1) measurement from paper maps; (2) on-screen extraction from raster maps; (3) using GIS and two different resolutions of grid-based digital elevation models (DEMs); and (4) using a triangulated irregular network (TIN). Table 5.1, Table 5.2, and Table 5.3 summarize the results found for Area 1, Area 2, and Area 3. It should be noted that perimeter is not a hydrologic parameter. It is evaluated in this study to examine trends in line computation among methods.

Area Miles2

Perimeter Miles

0.55 0.55 0.52 0.54 0.54 0.53 0.53 0.54 0.01 2.07

3.31 3.42 3.24 4.06 4.08 3.76 4.09 3.71 0.38 10.28

Table 5.1: Area 1 Results

Digitized-no hwy Case II

Mean Std.Dev. CV(%)

LFP Slope

Area 1

Area 1

Case Number

Hand

Case I

Digitized-hwy

Case II

PrePro-30

Case III

PrePro-10

Case III

WMS-30

Case III

WMS-10

Case III

Miles

%

1.69

1.27

1.79

1.27

1.57

1.32

1.50

1.26

1.56

1.36

1.38

1.36

1.54

1.25

1.58

1.30

0.13

0.05

8.42

3.65

90

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