Agriculture Reference
In-Depth Information
surfaces, roadway, or parking lots is to warp the surfaces so as to direct
water to a central low point such as a catch basin. Where large expanses
of pavement are involved, a gently sloping surface is formed to direct
the water to a series of evenly spaced catch basins. This system of water
collection is a good solution where there is not a lot of elevation change
within the paved area. The designer is able to maintain the visual effect
of a level brick area while creating gradual slope sufficient to direct
the water to the central catch basins. The drainage system shown in
Figure 14.16-A is a variation where a strip catch basin called a French
drain was installed down the center of a campus walkway. The walk
was graded to sheet-drain surface water to the central drain. The drain
itself has a sloping bottom where water is collected and distributed by
an underground pipe to the campus storm water infrastructure. Fig-
ure 14.16-B shows a variant application of a French drain system with a
central catch basin to collect surface water.
The ponding that occurred shortly after a hard morning rain (Fig-
ure 14.17-A) may not have been anticipated at the time the campus space
was constructed. Quite possibly, in this case, the original grading plan
provided for adequate sheet drainage to a nearby catch basin; however,
over the years since the original construction, the ground may have
settled, forming a low area to collect storm water in a temporary pond.
3%
2%
Figure 14.16-a and 14.16-B
Alternative designs to catch basin: French drain (14.16-A) and combination French drain with
catch basin (14.16-B)
