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iv. The fill shall be composed of rock or soil and shall not contain <br /> building debris, vegetation or refuse materials; and <br /> V. Shall not adversely affect the flow of surface drainage from or <br /> onto neighboring properties, shall be certified by a licensed <br /> engineer that the construction will not increase the base flood <br /> by more than 0.10 feet and when necessary storm water <br /> management techniques such as swales or basins shall be <br /> designed, incorporated and maintained. <br /> b. An existing building may be elevated on solid walls in accordance with the <br /> following: <br /> i. 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 /> ii. 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 /> iii. 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 an Illinois licensed professional <br /> engineer and inspected during construction to assure <br /> compliance, but at a minimum one opening on each wall <br /> having a total net area of not less than one (1) square inch per <br /> one (1) square foot of enclosed area will be provided. The <br />