Agriculture Reference
In-Depth Information
Figures 11.20 and 11.21 show two different views of the same
parking lot. Follow the drainage arrows in the parking lot shown in Fig-
ure 11.20. The surface water sheet flows toward the curb and is allowed
to drain to the adjacent entry drive though a channel. The view of the
same parking lot in Figure 11.21 was taken to help the viewer visualize
the drainage pattern. In this case, the parking lot surface was divided
into several sections with each section sloped toward the curb and catch
basin. The sections of pavement were designed so that water is directed
toward the curb; at the same time, the lot has been graded so that water
flows along the curb toward either a catch basin or drainage channel
outlet. Surface water is directed by elevating the driving lane forming a
crown at a higher elevation than the parking spaces, thus directing sur-
face flow to the curbs.
Figures 11.22-A and 11.22-B show two diagrams graphically repre-
senting two approaches for contour grading a simple parking lot. The
contours in Figure 11.22- B direct the flow of surface water toward the
center of the driving lane, while the surface water is directed toward
the perimeter of the parking spaces in Figure 11.22-A. Note the location
of the catch basin in the figure. The arrows show the direction surface
water directed from centerline (dashed line A) of the parking lot toward
the catch basin.
Catch
Basin
Roadway Crown
Roadway Crown
Figure 11.20 In this view the water from the parking lot
is directed to a channel crossing through a planting area
toward an adjacent entrance driveway
Figure 11.21 View of parking lot showing how surface
water might be directed across its surface to catch basins
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