Iowa Code § 479B.17
A pipeline company operating a pipeline or an underground storage facility shall have reasonable access to the pipeline or underground storage facility for the purpose of constructing, operating, maintaining, or locating pipes, pumps, pressure apparatus, or other stations, wells, devices, or equipment used in or upon the pipeline or underground storage facility. A pipeline company shall pay the owner of the land for the right of entry and the owner of crops for all damages caused by entering, using, or occupying the lands and shall pay to the owner all damages caused by the completion of construction of the pipeline due to wash or erosion of the soil at or along the location of the pipeline and due to the settling of the soil along and above the pipeline. However, this section does not prevent the execution of an agreement between the pipeline company and the owner of the land or crops with reference to the use of the land.
Iowa Code § 479B.17