Agriculture Reference
In-Depth Information
35
35
A
A
B
B
E
E
34
34
F
D
C
D
C
33
33
32
32
40 Scale
31
31
40 Scale
Figures 10.20-a and 10.20-B
Now let's calculate the elevation of points
B and D in Figure 10.20-C.
Consider for a moment that the paved
surface is sloping at a uniform 2 percent from
A to C, so that we could calculate the elevation
of any point along the diagonal connecting the
two points A and C. Draw a line connecting
points B and D. Assuming the line is perpen-
dicular to the AC line, any point along the BD
line would have the same elevation. To calcu-
late the elevation for points B and D, knowing
that any point along the line between B and D
is the same elevation, including point F, let's
calculate the elevation of point F from point A.
35
A
B
E
34
F
G
H
D
C
33
32
31
40 Scale
Figure 10.20-C
S = V / H
H or distance from point A to point F = 34'
.02 = V / 34
V = .02 × 34
V = 0.68
The elevation of point F = 34.4 - .68 = 32.64
So the elevation of points F, B, and D are the same = 33.72
