Gumpmaster,
Another good question. I have heard this a few times from people on the west coast. Type I, II, III and IV tanks are all designed using the same seismic load equations that are either provided in ACI 350.3 or AWWA D110, the later of which is being revised and will be out in a few...
Good Questions Gumpmaster,
And also, good information from JedClampett. As someone who has designed hundreds of wire-wrapped prestressed concrete tanks (both Type II and Type III), a former owner of a prestressed concrete tank firm in the southeastern US and a current owner of a nationwide...