Agriculture Reference
In-Depth Information
paved SurfaceS Water fLoW
One does not think of paved surfaces such as plazas, parking lots, and
trails and roads as being plastic in the same sense as earthen landforms,
which can be shaped like clay. But paved surfaces (made from concrete,
asphalt, and even modular precast forms) can be warped to shapes that
are undulating to a certain degree of sculptural fluidity. Visualize a
skateboard park with its undulating, daredevil-challenging ramps and
sunken, bowl-shaped areas. The parking lot shown in Figures 11.19-A
and 11.19-B is another, less extreme example of a warped, modestly
sculpted paved surface. The asphalt was laid down with a purposefully
warped surface so as to direct water drainage (runoff) toward a catch
basin located next to the curb on the left of the parking spaces. The
diagram in Figure 11.19-B shows what the contours might look like to
achieve a warped surface. The contours together with the arrows show-
ing the direction of surface water should give you some idea of the shape
of the warped paved surface. The parking lot is set at a higher elevation
at either end near the entranceways. The surface is tilted or sloped (per-
haps 2 percent) toward the middle of the lot, with a crown along the
central drive lane. At the same time, the surface is warped toward either
side of the drive lane, with water flowing toward catch basins at the curb
located at the front end of the parking spaces.
1 0 1
1 0 0
C a t c h
B a s i n
9 9 . 2
1 0 0
1 0 1
1 0 2
Figures 11.19-a and 11.19-B
Campus parking lot
