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projects, and similar structures. It does not include slash or woody vegetation, if the slash or woody vegetation originated from vegetation growing in the wetland and does not impair the flow or circulation of water or the reach of the wetland. Subp. 19. Floodplain wetland. "Floodplain wetland" means a wetland located in the floodplain of a watercourse, with no well defined inlets or outlets, including tile systems, ditches, or natural watercourses. This may include the floodplain itself when it exhibits wetland characteristics. Subp. 20. Flow - through wetland. "Flow- through wetland" means a wetland with both a well defined outlet and one or more well defined inlets, including tile systems, ditches, or natural watercourses. Subp. 21. Hydric soils. "Hydric soils" means soils that are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions in the upper part. Subp. 22. Hydrophytic vegetation. "Hydrophytic vegetation" means macrophytic plant life growing in water, soil, or on a substrate that is at least periodically deficient in oxygen as a result of excessive water content. Subp. 23. Impact. "Impact" means a loss in the quantity, quality, or biological diversity of a wetland caused by draining or filling. Subp. 24. Impacted wetland. "Impacted wetland" means a wetland that has been drained or filled, partially or wholly, and is subject to replacement. Subp. 25. Infrastructure. "Infrastructure" means storm water and sanitary sewer piping, outfalls, inlets, street subbase, roads, and ditches, culverts, bridges, and any other work defined specifically by a local government unit as constituting a capital improvement. Subp. 26. Introduced hayland. "Introduced hayland" means an area devoted to the production of forage and cultivated in a rotation of row crops or small grains or interseeded with introduced -or native species at least twice during the ten -year period - before January 1, 1991. The ten -year period may be enlarged to the 20 -year period before January 1, 1991, upon clear evidence of the qualifying practice in Agricultural Stabilization and Conservation Service or other aerial photographs or records, or the affidavit of a plant ecologist certified by the Ecological Society of America. These areas must be harvested by mechanical methods at least two years during the period January 1, 1986 to January 1, 1991. These areas are considered to be in agricultural crop production. Subp. 27. Introduced pasture. "Introduced pasture" means an area devoted to the production of forage and cultivated in a rotation of row crops or small grains or interseeded with introduced species at least twice during the ten -year period before January 1, 1991. The ten -year period may be enlarged to ' the 20 -year period before January 1, 1991, upon clear evidence