Agriculture Reference
In-Depth Information
contours (for instance, halfway between 103 and 104). The spot eleva-
tions at the top and bottom of the curbs for the four contours shown in
the figure are summarized as follows:
table 13.1
Relation of Spot Elevations along a Curb to Contours
top oF CurB eLevation
BottoM oF CurB eLevation
D 103
103.5'
103.0'
C 104
104.0'
103.5'
C 105
105.0'
104.5'
C 106
106.0'
105.5'
Curb, slope, spot elevation, and contour line mark-ups have been
added to the photograph in Figure 13.11 to facilitate visualizing a park-
ing lot as it would be drawn in a site-grading plan. A 2 percent cross
slope was created with the contours (Item A).
C
C
105
106
C
104
105
D
CB
103.5
B
104
A
103
102
Crown
Figure 13.11
Parking lot with crown shown in photograph with diagram to right
The photographs in Figure 13.11 show how water flow is directed in
a parking lot using contours and spot elevations. The contours shown in
Figure 13.12 have been drawn to create a valley down the center of the
drive with surface water sheet flowing at a 1 percent slope. The valley
solution concentrates water down the center of the drive lane, reducing
water in the parking spaces so that people stepping out of their vehicles
