07-05-2019, 04:00 AM
Related issue: servicability. If you ever need a water delivery or septic pump-out, it's best if the truck can drive right up to the tank, or at least have a clear space to drag the hose. I don't know how much hose they carry, might be worth asking around.
Foundation for catchment varies but is usually (?) sand. Large corrugated tanks work best when they have a concrete ring for the steel to rest on, this keeps the sand from leaking out around the edges. Slab would work best for a one-piece plastic tank, but that will require engineering and inspection. Sand isn't cheap, but it's still less expensive than concrete.
Water tanks (over 4' high?) require a permit, of course.
Foundation for catchment varies but is usually (?) sand. Large corrugated tanks work best when they have a concrete ring for the steel to rest on, this keeps the sand from leaking out around the edges. Slab would work best for a one-piece plastic tank, but that will require engineering and inspection. Sand isn't cheap, but it's still less expensive than concrete.
Water tanks (over 4' high?) require a permit, of course.