Figure 2-6. Slope representation
Now the average for path 2 must be calculated. It is important to remember that the average for path 2 is not the
arithmetical average of path 2A and 2B. If the arithmetical average of both of these paths were taken and used as
an average, the watershed area for path 2 would be misrepresented (see figure 2-7, page 2-14). By taking the
difference in elevation from the start of path 2a on the eastern hilltop and the end of path 2B at the culvert inlet
and dividing the difference by the cumulative total of path lengths 2A and 2B, we can accurately calculate the
average slope for the entire watershed area that path 2 represents.
2-13
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