Iowa Admin. Code r. 27-30.20
When used in this chapter:
"Agricultural drainage well" means a vertical opening to an aquifer or permeable substratum which is constructed by any means including but not limited to drilling, driving, digging, boring, augering, jetting, washing, or coring, and which is capable of intercepting or receiving surface or subsurface drainage water from land directly or by a drainage system.
"Agricultural drainage well area " means an area of land where surface or subsurface water drains into an agricultural drainage well directly or through a drainage system connecting to the agricultural drainage well.
"Alternative drainage system " means a drainage system constructed as part of a drainage district in order to drain surface or subsurface water from land due to the closing of an agricultural drainage well.
"Designated agricultural drainage well area " means an agricultural drainage well area in which there is located an anaerobic lagoon or earthen manure storage basin required to obtain a construction permit by the department of natural resources.
"Division " means the division of soil conservation and water quality of the department of agriculture and land stewardship.
"Drainage district" means a drainage district established pursuant to Iowa Code chapter 468.
"Drainage system" means tile lines, laterals, surface inlets, or other improvements which are constructed to facilitate the drainage of land.
"Earthen storage structure " means an earthen cavity, either covered or uncovered, including but not limited to an anaerobic lagoon or earthen manure storage basin which is used to store manure, sewage, wastewater, industrial waste, or other waste regulated by the department of natural resources, if stored in a liquid or semiliquid state.
"Land" means land which is used or which is suitable for use for any purpose, if the land is located within an agricultural drainage well area which includes land used or suitable for use in farming.
"Noncrop acres " means a land tract as identified in the assessment schedule in the report of the classification commission adopted at public hearing pursuant to Iowa Code sections 468.44 through 468.46 which is not predominantly used for row crop production. Areas used for wetland mitigation shall not be considered in determining predominant land use.
"Watershed area " means the benefited land area of a drainage district.
Iowa Admin. Code r. 27-30.20