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Drainage:

Curb inlets are more efficient than flush grates located in the
middle of parking areas along the centerline. Part of this prejudice
is based on the observation that pedestrians walk along the centerline,
even though walkways are provided in the median. Leaves tend
to build up over flush grate openings and are better collected in
open throats along the curb than in the middle of the pavement.
Also, consider the fact that noise can result from each car driving
over a loose grate when the inlet is located on the centerline.