Abstract: A thin-walled deep grain storage tank with improved sidewall discharge system involving a plurality of successive flat plates periodically mounted to the inside of a pair of vertical, parallel I-beam and/or Z-bar sidewall support members with openings for grain flow between successive plates, and a sidewall discharge means at the base of the tank. In this manner an internal chute is formed capable of staged discharge from successive top strata of stored grain. Such a system is useful in alleviating the problems associated with the build up of excess eccentric sidewall pressure during grain discharge without significantly altering the design and construction parameters and their associated economics.