Agriculture Reference
In-Depth Information
onto the landscape to help the viewer visualize the three-dimensional
aspect of the grading solution.
Figures 12.5-A through 12.5-E provide a closer look at this signature
grading solution. In this example, the building pad is a rectangular shape
with a uniform slope of 2% beginning at corner B and sloping toward corner
C. The designer would need to begin by establishing an elevation for corner
A. Once an elevation is established for corner A, the designer would next
calculate the elevations for the other corners, then reposition the contour
lines that will create the sloping plane and surrounding drainage swales.
The process for creating this grading solution is shown in Figure 12.6.
Where the designer has placed a sloping paved surface such as a
tennis court, patio, or parking lot on sloping terrain, spot elevations as
well as contours will need to be calculated and located, representing
the desired modifications of the existing terrain. The signature solution
shown in Figure 12.1-C can be thought of as the application of two sig-
nature solutions, 12.1-A and 12.1-B, to solve the grading situation. Also
consider that in this example it is not necessary to inhibit the flow of
surface water onto the pad surface, as we will do in the signature solu-
tion shown in Figure 12.1-D.
In the example shown in Figure 12.5 -A, the spot elevation (B) for the
uphill corner of the pad surface is 104.5. Notice that this spot elevation
falls between two existing contours: 104 and 105, so the designer decided
to set the elevation of the corner at 104.5´. Next, the designer would begin
at the 104.5 spot elevation and use the slope designation of 2 percent to
determine the elevation of spot elevation (C), using the formula S = V / H.
The elevation for spot elevation (C) was calculated as 102.5´ (Figure 12.5-B).
Considering Figure 12.5-B, the designer would notice that two con-
tours could be located between the two spot elevations 104.5 and 102.5.
These contours are 103 and 104. To find their location the designer would
use the formula S = V / H. For instance, to find the location of contour 104,
take the vertical elevation difference of 104.5 and 104, which is 0.5´:
S = V / H
.02 = .5 / H
H = .5 / .02
= 25 feet
