English translation: (Drainage) "Overpasses/Underpasses
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Crossing structures are used to pass over or under obstacles in the field. There are three types of crossing structure to transport irrigation water, namely: aqueducts, culverts, and inverted syphons, and there also are crossing structures not meant for water conveyance: bridges. ftp://ftp.fao.org/docrep/fao/010/ai586e/ai586e04.pdf
AEGC shall construct all project-related drainage crossing
structures to pass a 100-year flood and AEGC shall coordinate with
the Illinois Department of Natural Resources to ensure the new
floodplain crossings are appropriately designed to minimize impacts http://edocket.access.gpo.gov/2006/E6-2655.htm