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Under this method Lf is the average flow path length, ni is the number of f l o w p a t h s i n t h e s u b c a t c h m e n t , i i s t h e f l o w p a t h c o u n t e r , a n d l f t h e l e n g t h o individual flow paths. Figure 2.5 shows the results by Garbrecht et al. (1999b) for the 177 subcatchments, using manual and automated methods of length extraction. f

Figure 2.5: Frequency Distribution of Subcatchment Length (Garbrecht et al., 1999b)

Figure 2.5 is an example of parameter value variations, in this case subcatchment length, that occur using different methods of parameter extraction (automated and manual) and different models for data reduction. The distance to divide length is twice the average travel distance for rectangular-shaped subcatchments and 1.33 times the average travel distance for triangular-shaped subcatchments. The distance to divide and the manual method closely resemble each other since they represent the same length from the watershed boundary to

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