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management techniques such as swales or basins shall be <br /> designed, incorporated and maintained. <br /> ii. An existing building may be elevated on solid walls in accordance with the <br /> following: <br /> a. The building or improvements shall be elevated on stilts, piles, <br /> walls, crawlspace, or other foundation that is permanently open <br /> to flood waters; <br /> b. The lowest floor and all electrical, heating, ventilating, <br /> plumbing, and air conditioning equipment and utility meters <br /> shall be located at or above the flood protection elevation; <br /> C. If walls are used, all enclosed areas below the flood protection <br /> elevation shall address hydrostatic pressures by allowing the <br /> automatic entry and exit of flood waters. Flood protection <br /> designs must be certified by a licensed professional engineer or <br /> by having a minimum of one (1) permanent opening on each <br /> wall no more than one (1) foot above grade with a minimum of <br /> two (2) openings having a total net area of not less than one (1) <br /> square inch per one (1) square foot of enclosed area subject to <br /> flooding below the base flood elevation; and, <br /> d. All components below the flood protection elevation shall be <br /> constructed of materials resistant to flood damage; <br /> (i) Water and sewer pipes, electrical and <br /> telephone lines, submersible pumps, and other <br />