Agriculture Reference
In-Depth Information
C
S
5
B
S
4
S
4
B
A
A
S
2
S
2
S
3
S
3
S
1
S
1
Figure 13.3-C
Step Three
Figure 13.3-d
Step Four
deSiGn proceSS for GradinG a BicycLe
traiL and parK WaLKWay
The design of ramps and walks is approached in a similar manner.
Figure 13.4-A shows a 10-foot-wide concrete bike trail/walkway in a
neighborhood city park. The walkway was designed with a varied slope
to conform to the existing terrain. In Figure 13.4-B, the main slope is
approximately 1 percent (item A) with a 1 percent cross slope (items B1
and B2). Notice the position of the con-
tours relative to the general direction of
the walkway in Figure 13.4-C. They cross
the width of the walkway at an angle. This
angle is called the cross slope. The left side
of the walk is higher than the right side
so that the walk surface is tilted downhill
toward the right (thereby creating the cross
slope).
Step One: The arrow positioned down
the center of a 10-foot-wide pedestrian
walkway represents the main slope. Sec-
tions of the line may have varied slopes,
Figure 13.4-a
Step One showing the direction the walk-
way slopes
