Agriculture Reference
In-Depth Information
Where Spot eLevationS are neceSSary
Spot elevations should be the primary information provided in site-grading
plans to establish elevation for the following site design elements:
1.
Stairs
2.
Ramps
3.
Walls and fences
4.
Rim elevation of drains
5.
Beginning and ending of swales
6.
Finish grade elevations of hardscape elements and structures
7.
Existing trees to be saved
8.
Finish grade of elevation of special landscape elements
1. Stairs:
Top and bottom of group or run of stairs with a note indicating
the number of stairs in the run and the height of stair rise.
The + symbol is used in grading plans to note the location of a spot
elevation. In Figure 10.2 two spot elevations are noted as spot elevation A
and spot elevation B. Typically, spot elevations are given at the bottom and
top most steps. A note on the plan would indicate the number of steps plus
the riser height of each step indicated by C in Figure 10.2. A note would be
added in the plan indicating the number of steps (in the case) between spot
elevations A and B and the riser height: 8 Steps with 12´ tread and 6˝ risers.
Spot elevations A and B designate the top and bottom of each flight
of stairs shown in Figure 10.3 Spot elevations are needed at the bottom
of each flight of stairs as well as the top step. Normally a note is also
included noting the number of stairs for each flight and the height of the
riser (five steps with 5½-inch riser, or height). Technical details would
further articulate other critical dimensions and details for the stairs. A
more complex design incorporating stairs, terraces, and ramps is shown
in Figure 10.4. The letters stand for the following elements in the figure:
A = Slope of the paving surfaces shown as a percent. A spot elevation is given at
the start and end of each similarly sloped surface.
