Figure 2-14. Percent of Slope Overlay.

When this overlay is added to Figure 2-13, the analyst may be able to eliminate

otherwise likely avenues of approach based on trafficability.

An easier method of determining the percent of slope is to construct a slope

calculator. To do this you must count the number of contour intervals for a

given

distance and draw them by using tick marks on a piece of translucent paper.

By

matching the contour lines with those used to determine the first percentage

of

slope, you can determine very quickly if the percentages are the same. This

saves

time in computing each difference in elevation.

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