ACI 350.3-06 is a technical standard published by the . The full title is "Seismic Design of Liquid-Containing Concrete Structures (ACI 350.3-06) and Commentary."
: This is the main code document that provides requirements for the design, construction, and testing of reinforced concrete structures that are used to contain liquids or other materials. The code covers aspects such as material properties, structural integrity, leakage control, and testing.
If you have just downloaded ACI-350.3-06.pdf, here is the standard engineering workflow for designing a new circular water tank in Seismic Design Category C (SDC C):