Ord 1990-037 - Laserfiche WebLink

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-lO- designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding; (e) All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system; (f) New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system and discharge from the systems into flood waters; and, (g) On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding. Sec. 5-64 S"{)eCific standards for construction. In all areas of special flood hazards, the following provisions are required: (a) Residential construction: New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated to or above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that this standard is satisfied. (b) Nonresidential construction: New construction and substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest flood (including basement) elevated to or above the base flood level or, together with attendant utility and sanitary facilities, be designed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall develop and/or review structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specific elevation in relation to mean sea level to which such structures are floodproofed, shall be maintained by the floodplain administrator. (c) Enclosures: New construction and substantial improvements, with fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, building access, or storage in an area other than a basement, and which are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria: ( l) A minimum of two (2) openings having a total net area of not less than one (l) square inch for every square foot of enclosed area subject to flooding shall be provided. (2) The bottom of all openings shall be no higher than one ( l) foot above grade. (3) Openings may be equipped with screens, louvers, valves, or other coverings or devices provided. that they permit the automatic entry and exit of floodwaters. (d) Manufactured homes: ( 1) All manufactured homes to be placed within zone A, shall be installed using methods and practices which minimize flood damage. For the purpose of this requirement, manufactured homes must be elevated and anchored to resist flotation, collapse or lateral movement. Methods of anchoring may include, but are not limited to, use of over-the-top or frame ties to ground anchors.