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Parameter Sensitivity in Hydrologic Modeling - page 132 / 163

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Study Area

CV (%) Area

CV (%) LFP

CV (%) Slope

CV (%) CN

Area 1

2.07

8.42

3.65

3.01

Area 2

0.81

3.90

2.97

3.08

Area 3

1.52

3.22

1.80

3.11

Table 5.19: Parameter Coefficients of Variation (CV)

Drainage area CV values are the smallest of the parameter CV values for

Area 1, Area 2, and Area discharge is elastic, the error

3.

Although

the

relationship

between

area

and

associated with determining drainage area is small.

On the other hand, path and slope.

there is a larger error associated However, since longest flow

with path

determining longest flow and slope are inelastic

parameters, large errors changes in discharge.

in

determining

these

values

will

cause

minimal

percent

Table 5.20 shows the percent discharge variations resulting from parameter variations for Area 1, Area 2, and Area 3.

Table 5.20: Discharge Variations for Area 3

Paramet

Area LFP Slope CN

er

Discharge CV% (Area 1)

    • 2.07

      *1.06=2.19%

    • 8.42

      *-0.22=-1.85%

    • 3.65

      *0.14=0.51%

    • 3.01

      *0.99=3.00%

Discharge CV% (Area 2)

    • 0.81

      *1.06=0.86%

    • 3.90

      *-0.22=-0.86%

    • 2.97

      *0.14=0.42%

    • 3.08

      *0.99=3.05%

Discharge CV% (Area 3)

    • 1.52

      *1.06=1.61%

    • 3.22

      *-0.22=-0.71%

    • 1.80

      *0.14=0.25%

    • 3.11

      *0.99=3.08%

122

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