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EP480 and EP481 are available as Historical documents and may be purchased by contacting the ASABE Order Department at 1-800-695-2723 or OrderStandard@asabe.org.

ASAE EP480, Design of Agricultural Subsurface Drains in Humid Areas and ASAE EP481, Construction of Agricultural Subsurface Drains in Humid Areas, have been withdrawn and replaced by ASAE EP260.5, Design and Construction of Subsurface Drainage Systems on Agricultural Lands in Humid Areas.