459.311D Stockpiling dry manure on karst terrain. A person stockpiling dry manure on karst terrain shall comply with all of the following: 1. The person shall stockpile the dry manure at a location where there is a vertical separation distance of at least five feet between the bottom of the stockpile and the underlying limestone, dolomite, or other soluble rock. 2. A person who stockpiles dry manure for more than fifteen consecutive days shall use any of the following: a. A qualified stockpile structure. b. A qualified stockpile cover. However, the person shall not stockpile dry manure using a qualified stockpile cover at a long-term stockpile location unless the stockpile is located on reinforced concrete at least five inches thick. 2009 Acts, ch 38, §12, 16
Iowa Legal Code