Iowa -326 million bu. 1 Outdoor grain piles. Piling grain outdoors shouldn't be considered a last resort, provided you prepare a proper site and invest in grain covers. The advantage of outside piles is that they are large on volume. Bump that up another 340 bushels for each additional foot of grain you add to the length of the pile.
Drainage is crucial to outdoor storage.
Select a site on high ground and crown the earth under the pile. Be sure to run piles north and south. This allows the sun to dry off the sloping sides. And install an aeration tube that runs the length of the pile. 2 Existing buildings.