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Parameter Sensitivity in Hydrologic Modeling - page 110 / 163

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LFP

% Slope

CN

SCS

Miles

(mean)

(mean)

Lag, Min

1.45

89.00

longest flow path was allowed to vary. Table 5.6 gives the lag time values calculated for each longest flow path measurement.

Table 5.6: Longest Flow Path Calculations

Hand Digitized-no hwy Digitized-hwy PrePro-30 PrePro-10 WMS-30 WMS-10 TIN MEAN ΔXmax-min /Xmean

3.14 3.28 3.09 3.06 3.21 2.87 3.15 3.14 3.12 13.2%

ΔYmax-min MEAN /Ymean

109.8 113.7 108.4 107.5 111.7 102.2 110.1 109.8 109.0 10.6%

Subtracting the highest longest flow path measurement from the lowest longest flow path measurement, and then dividing by the mean flow path length determines the longest flow path variation. Figure 5.6 below demonstrates this process for the calculation of longest flow path.

100

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