Standard practice for Design Construction of Concrete Silos and Stacking tubes for Storing Granular Materials ACI 313-97

Static pressure are exerted by the stored materials at rest and shall be computed by methods presented in this book,flow pressures that differ from static pressure are exerted by stored material during flow and shall be computed by the methods presented in this book.

Building Code Requirements for Structural Concrete (ACI 318M-11)

ACI Committee Reports, Manuals, Guides, Standard Practices, and
Commentaries are intended for guidance in planning, designing, executing and inspecting construction.