Mississippi Administrative Code › Title 33 - Public Health - Local Governments And Rural Water Systems Improvements Board › Part 208 - Flood Damage Prevention Regulation › Chapter 5 - Provisions for Flood Hazard Reduction › Rule 33-208-5.1 - General Standards for All Zones

Current through June 25, 2024
In all areas of special flood hazard the following
				  provisions are required:
(1) New
				construction and substantial improvements shall be anchored to prevent
				flotation, collapse and lateral movement of the structure.
(2) Manufactured homes shall be anchored to
				prevent flotation, collapse, and lateral movement. Methods of anchoring may
				include, but are not limited to, use of over-the-top or frame ties to ground
				anchors. Dry stacked blocks (stacked without the use of mortar or cement to
				bond them together) are not to be used as an anchor/elevation method. This
				standard shall be in addition to and consistent with applicable state
				requirements for resisting wind forces.
(3) New construction and substantial
				improvements shall be constructed with materials and utility equipment
				resistant to flood damage.
(4) New
				construction or substantial improvements shall be constructed by methods and
				practices that minimize flood damage.
(5) Electrical, heating, ventilation,
				plumbing, air conditioning equipment and other service facilities shall be
				designed and/or located so as to prevent water from entering or accumulating
				within the components during conditions of flooding, such facilities shall be
				located a minimum of 18 inches above the Base Flood Elevation.
(6) New and replacement water supply systems
				shall be designed to minimize or eliminate infiltration of flood waters into
				the system.
(7) New and replacement
				sanitary sewage systems shall be designed to minimize or eliminate infiltration
				of flood waters into the systems and discharges from the systems into flood
				waters.
(8) On-site waste disposal
				systems shall be located and constructed to avoid impairment to them or
				contamination from them during flooding.
(9) Any alteration, repair, reconstruction or
				improvements to a building that is in compliance with the provisions of this
				Regulation shall meet the requirements of "new construction" as contained in
				this Regulation.
(10) Any
				alteration, repair, reconstruction or improvements to a building that is not in
				compliance with the provisions of this Regulation, shall be undertaken only if
				said non-conformity shall meet the requirements of "new construction" as
				contained in this Regulation.
(11)
				All gas and liquid storage tanks (both above and below ground) shall be
				adequately anchored to prevent floatation, lateral movement resulting from
				hydrodynamic forces, and the effects of buoyancy.
(12) When new construction and substantial
				improvements are located in multiple flood zones or in a flood zone with
				multiple base flood elevations, they shall meet the requirement for the more
				stringent flood zone and the highest base flood elevation.
(13) New construction and substantial
				improvement of any building (both in and outside the SFHA) shall have the
				lowest floor (including basement) at least one foot above the centerline of the
				designated street, unless the topography of the property does not allow for
				strict adherence as determined by the Floodplain Administrator.
(14) All new horizontal additions must have
				the lowest floor and all HVAC elevated to the regulatory base flood
				elevation.
(15) New construction
				and substantial improvements of structures built on fill (only allowed outside
				of the CHHA and Coastal AE Zone) shall be constructed on properly designed and
				compacted fill that extends 10 feet to 15 feet beyond the building walls before
				dropping below the base flood elevation, and shall have appropriate protection
				from erosion and scour as follows:
a.) Fill
				sites, upon which structures will be constructed or placed, must be compacted
				to 95 percent of the maximum density obtainable with the Standard Proctor Test
				method or an acceptable equivalent method.
b.) Fill slopes shall be no steeper than one
				foot vertical to two feet horizontal.
c.) Adequate protection against erosion must
				be provided for fill slopes.
When expected velocities during the occurrence of the base
				  flood are greater than five feet per second, armoring with stone or rock
				  protection or material that will provide equivalent resistance will be
				  provided. When expected velocities during the base flood are five feet per
				  second or appropriate protection shall be provided by covering them with
				  vegetative cover at a minimum.
d.) Fill shall be composed of clean granular
				or earthen material.