Agriculture Reference
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do not know S, but you can calculate the slope because you can figure
out the elevation difference between points A and B. You also know
the horizontal distance between the two points.
S = V / H
To determine V subtract the elevation of point B from A = 1.6 feet
To determine S divide 1.6 by 42 feet = .038 or 3.8%
Now using the same figure and the information you used to cal-
culate slope, next locate the 56 elevation between points A and B. See
Figure 9.20.
To find the location of the 56 spot elevation on a sloping surface
in Figure 9.20, you first need to ask: What do you know?
S = .038 (3.8%)
H = is what you need to calculate, using the formula S = V / H
V is the 56.8' elevation of point A minus 56' = 0.8'
A
56.8
5 6
5 5.2
B
56.8
A
S = V/H
.038 = .8/H
H = .8/.038
H = 21.05'
1.6
55.2
B
H = 21.05'
Figure 9.20 Locating spot elevation 56 in this
diagram
 
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