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Parameter Sensitivity in Hydrologic Modeling - page 112 / 163

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5.2.1.2 Slope

The lag time elasticity with respect to slope was calculated by holding the longest flow path and curve number constant and varying the slope. The results from this calculation are shown in Table 5.7.

Table 5.7: Slope Calculations

Hand Digitized-no hwy Digitized-hwy PrePro-30 PrePro-10 WMS-30 WMS-10 TIN MEAN

ΔXmax-min

/Xmean

% LFP Slope (mean),Miles

3.12 1.47 1.47 1.44 1.39 1.43 1.46 1.41 1.53 1.45

9.7%

CN (mean)

89.00

MEAN /Ymean ΔYmax-min

SCS Lag, Min.

107.8 107.8 108.9 110.9 109.3 108.2 110.1 105.7 108.6

  • -

    4.8%

As can be seen from Figure 5.7, there is an inverse relationship between lag time and slope.

102

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