Agriculture Reference
In-Depth Information
The photograph in Figure 10.13 provides another example of the use
of spot elevations for a site-grading plan.
A = Finish grade at building entry. Entry landing is sloped away from building
toward steps.
B = Spot elevations at top and bottom of steps, key points at corners of paved
surfaces or where there is a change in paving slope.
Arrows indicate direction of slope of pavement surfaces. In
addition to arrows showing the direction of pavement is to slope, a
percentage would normally be included, with a percent provided with
each arrow. In this example, the primary slope directs the water away
from the building and steps. The second arrow indicates a cross slope
to pitch surface water toward the grass area, eventually to a catch
basin in the lawn.
7. existing trees to be saved:
Spot elevations are necessary and should
be provided at the base of the tree trunk and within the drip line, to con-
trol the finished grade at the base of tree trunks when earthwork involv-
ing cut and fill is critical to saving the trees. In Figure 10.14, item A is the
existing elevation at the base of the tree. Item B is the elevation of the
top surface of a partial tree well.
8. Finish grade of landscape features:
Such as ponds; detention/
retention basins; earth forms such as earth mounds and athletic
play surfaces; and sculpted hardscape forms such as skateboard
ramp forms.
The pond in Figure 10.15 was constructed by the farmer to retain
water runoff from surrounding slopes for farm use and as a backup
water supply for farm animals. Item A in Figure 10.15 indicates the high-
est elevation on the island. Item B is the designed water level, and item
C is the lowest elevation in the pond. Item D is the elevation of the pond
outlet, if one were to be provided. This elevation may be for the top of a
weir or other water control height structures.
