Agriculture Reference
In-Depth Information
Now let's calculate the elevation of point G (for practice, as there
is no significance to this point). To solve this, draw a line starting from
point G so that it is perpendicular to AC. The point where the line inter-
sects AC is noted as point H. If we find the elevation of point H, it is the
same elevation as point G.
S = V / H
H or distance from point H to point A = 50'
.02 = V /50'
V = .02 × 50'
V = 1.0'
The elevation of point H = 34.4' - 1.0' = 33.4
The elevation of point H is 33.4'. It is also the spot elevation for point G.
uSinG the riSer heiGht of StepS to
caLcuLate Spot eLevationS
Each of the seven steps has a 4" rise
7 × 4" = 28 inches or 2.33 feet
Elevation of point B is 32.4'
Elevation of point A is 32.4' + 2.33' = 34.73'
use of Spot elevations in
Grading plans
B
A
Site-grading plans contain a variety of
information used to communicate to the
contractor the desired elevation and land-
form for a project. The contractor uses the
information to lay out and to establish the
basis for guiding his work. Spot elevations
provide specific detailed elevations for
key locations throughout paved surfaces;
heights of walls and other structures to
7
6
5
TW 106
4
3
2
4”
1
B
32.4
Each step
has 4” Riser
Figure 10.21 Steps leading to a campus administration
building
Search WWH ::




Custom Search