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Parameter Sensitivity in Hydrologic Modeling - page 114 / 163

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10m

30m

HEC-1

CN range

91.7

91.7

85.8

Table 5.8: Curve Number Measurements

%Slope LFP

SCS

CN

(mean) (mean), Miles

Lag, Min.

Table 5.9 outlines the curve number values. As mentioned earlier, this range is used to reflect a range of curve numbers that could likely result using traditional methods and derived mathematically using digital Land Use/ Land Cover and STATSGO soils data.

Table 5.9: Curve Number Calculations

126.4 122.0 117.6 113.3 108.9 104.6 100.4 96.1 91.9 109.0

  • -

    31.7%

MEAN ΔXmax-min

/Xmean

1.45 3.12

85 86 87 88 89 90 91 92 93 89 9.0%

ΔYmax-min MEAN /Ymean

This curve is plotted in Figure 5.8. relationship between curve number and lag time.

The graph shows the inverse

104

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