Iowa Code § 459A.301

If the department requires that a settled open feedlot effluent basin or animal truck wash effluent structure be constructed according to construction design standards, regardless of whether the department requires the owner to be issued a construction permit under section 459A.205, any construction design standards for the basin or structure shall be established by rules as provided in chapter 17A that exclusively account for special design characteristics of open feedlot operations and related basins or animal truck wash facilities and related structures, including but not limited to the dilute composition of settled effluent as collected and stored in the basins or structures.