Agriculture Reference
In-Depth Information
V
H
A
=
S
32.5
S
V
H
B
Figure 10.16 A reminder of the formula for calculating
slope and spot elevations
Figure 10.17 Use the information in the figure to
determine the elevation of point B
Using the formula S = V / H, write down all the relevant information
referring to Figure 10.17.
S is 3% or .03 (the slope of the walk)
H is 20 feet (horizontal distance from point A to point B)
V is what we will determine, to find the elevation of point B
Plug the numbers into the formula, then perform the calculation:
S = V / H
.03 = V / 20'
V = .03 × 20'= 0.6'= the elevation difference between points A and B
Subtract 0.6' from the elevation of spot elevation A to find the elevation of
point B (note: the percent of slope above the arrow shows that the direction
of the slope is minus 3%)
Elevation A is 32.5' so subtract 0.6' to find the elevation of point B = 31.9'
Referring to Figure 10.18, calculate spot elevation B knowing the
slope of the surface and the measured horizontal distance between
points A and B.
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