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Parameter Sensitivity in Hydrologic Modeling - page 104 / 163

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Figure 5.2: Coefficients of Variation

In Figure 5.2, SCS curve number is shown to give the reader an idea of the

curve

number variation that will be applied to the remainder of the study.

For

Area 2, a range of curve numbers was evaluated using a curve number selected by TxDOT as a low value (85.8), and a curve number derived by STATSGO soils data along with Land Use/Land Cover data as a high value (91.7). TxDOT did not provide curve number values for Area 1 and Area 3. Instead, a range the same as used in Area 2 was applied, with the curve number derived by STATSGO soils

data

along

with

Land

Use/Land

Cover

data

as

a

high

value.

These

values,

shown

in Table 5.4, were used to reflect reasonable might encounter in hydrologic modeling.

variations

of

curve

number

that

one

94

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