TM 5-803-13/AFM 126-8
are too steeply graded.
joint agricultural tile, perforated agricultural tile or per-
forated plastic pipe. Collected water can be channeled to
are the most permanent and effective means of collecting
a retention pond or dry-well, to the surface by exposing
excess water from plant pits and beds. Subsurface
the outlet at a low part of the site, or to a storm sewer
drainage systems may consist of French drains, open-
system (fig 3-1)
3-4
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