Agriculture Reference
In-Depth Information
S = V / H
.05 = 1 / H
H = 1 / .05
H = 20'
Using an engineer's scale, measure 20 feet in Figure 9.22 from
the 97´ contour line to locate the 96´ contour.
97
V
96
H
S = V/H
.05 = 1/H
H = 20'
20 Scale
Figure 9.23
Locating one-foot contours on a 5 percent sloping surface
Suppose you wanted to create a uniform slope using contour
lines. Refer to Figure 9.23. Assume you were starting from the 97´
contour line and wanted to create a 5 percent slope using contour
lines. You have already calculated the horizontal distance between
the 97´ and 96´ contour lines in Figure 9.23. Since you are continuing
with a uniform slope of 5 percent, the horizontal distance of the next
contours 95´, 94´, and further down-slope would also be 20 feet. Thus,
to create the 5 percent slope, you would measure a 20-foot distance
from the 96´ contour to the 95´ contour and from the 95´ contour to
the 94´ contour, and draw the lines for creating a uniform 5 percent
slope.
