Underground tanks in flood hazard areas shall be anchored to
prevent flotation, collapse or lateral movement resulting from hydrodynamic
and hydrostatic loads during conditions of the design flood, including
the effects of buoyancy, assuming the tank is empty.
Aboveground tanks that do not meet the elevation requirements of § 108-73 of this chapter shall:
A.
Be permitted in flood hazard areas (Zone A) other than coastal high-hazard
areas, provided the tanks are anchored or otherwise designed and constructed
to prevent flotation, collapse or lateral movement resulting from
hydrodynamic and hydrostatic loads during conditions of the design
flood, including the effects of buoyancy assuming the tank is empty
and the effects of flood-borne debris.
B.
Not be permitted in coastal high-hazard areas (Zone V).
Aboveground tanks in flood hazard areas shall be attached to
and elevated to or above the design flood elevation on a supporting
structure that is designed to prevent flotation, collapse or lateral
movement during conditions of the design flood. Tank-supporting structures
shall meet the foundation requirements of the applicable flood hazard
area.
Tank inlets, fill openings, outlets and vents shall be:
A.
At or above the design flood elevation or fitted with covers designed
to prevent the inflow of floodwater or outflow of the contents of
the tanks during conditions of the design flood; and
B.
Anchored to prevent lateral movement resulting from hydrodynamic
and hydrostatic loads, including the effects of buoyancy, during conditions
of the design flood.
