The department shall adopt rules establishing construction design standards for formed manure storage structures that are part of confinement feeding operations other than small animal feeding operations. However, the construction design standards shall apply to a formed manure storage structure that is part of a small animal feeding operation as provided in section 459.310.
 1. The department may provide for different standards based on criteria developed by the department, which may include any of the following:

 a. The animal unit capacity of the manure storage structure‘s confinement feeding operation or the manure storage structure’s manure volume capacity.
 b. Whether the manure storage structure stores only dry manure.
 c. Whether the manure storage structure is part of a confinement feeding operation building.
 d. The use of concrete, including its use for the structure’s footings, walls, or floor.

Terms Used In Iowa Code 459.307

  • Animal: means cattle, swine, horses, sheep, chickens, turkeys, or fish. See Iowa Code 459.102
  • Animal feeding operation: means a lot, yard, corral, building, or other area in which animals are confined and fed and maintained for forty-five days or more in any twelve-month period, and all structures used for the storage of manure from animals in the operation. See Iowa Code 459.102
  • Animal unit: means a unit of measurement based upon the product of multiplying the number of animals of each category by a special equivalency factor as follows:
     a. See Iowa Code 459.102
  • Confinement feeding operation: means an animal feeding operation in which animals are confined to areas which are totally roofed. See Iowa Code 459.102
  • Department: means the department of natural resources created pursuant to section 455A. See Iowa Code 459.102
  • Dry manure: means manure which meets all of the following conditions:
     a. See Iowa Code 459.102
  • following: when used by way of reference to a chapter or other part of a statute mean the next preceding or next following chapter or other part. See Iowa Code 4.1
  • Formed manure storage structure: means a covered or uncovered impoundment used to store manure from an animal feeding operation, which has walls and a floor constructed of concrete, concrete block, wood, steel, or similar materials. See Iowa Code 459.102
  • Karst terrain: means land having karst formations that exhibit surface and subterranean features of a type produced by the dissolution of limestone, dolomite, or other soluble rock and characterized by closed depressions, sinkholes, or caves. See Iowa Code 459.102
  • Manure: means animal excreta or other commonly associated wastes of animals, including but not limited to bedding, litter, or feed losses. See Iowa Code 459.102
  • Manure storage structure: means a formed manure storage structure or an unformed manure storage structure. See Iowa Code 459.102
  • Person: means an individual, partnership, firm, corporation, or association. See Iowa Code 462A.2
  • Use: means to operate, navigate, or employ a vessel. See Iowa Code 462A.2
 2. The construction design standards shall be based, to every extent possible, on uniform standards such as available standards promulgated by ASTM (American society for testing and materials) international. The department may require that all or any part of a formed manure storage structure be constructed of concrete.
 3. The construction design standards for concrete shall provide for all of the following:

 a. The concrete’s minimum compressive strength calculated on a pounds-per-square-inch basis.
 b. The use of reinforcement, including but not limited to the grade, amount, and location of steel rebar or fiberglass, wire mesh or fabric, or similar materials set in the concrete, or the use of exterior braces to support joints.
 c. The depth of footings.
 d. The thickness of the footings, the floor, and walls.
 4. A person shall only construct a formed manure storage structure on karst terrain or an area which drains into a known sinkhole pursuant to upgraded construction design standards necessary to ensure that the structure does not pollute groundwater sources.
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