Resolution 2025-075 – Resolution Setting as Public Hearing to Consider Adoption of an Updated Floodplain Management Ordinance for the City of Tiffin, Iowa.

optionally floodproofed to) a minimum of one (1) foot above the base flood elevation. (4) New and substantially improved structures shall be constructed with plumbing, gas lines, water/gas meters and other similar service utilities either elevated (or in the case of non-residential structures, optionally floodproofed to) a minimum of one (1) foot above the base flood elevation or designed to be watertight and withstand inundation to such a level. E. Factory-Built Homes: (1) All new and substantially improved factory-built homes, including those placed in existing factory-built home parks or subdivisions, shall be elevated on a permanent foundation such that the lowest floor of the structure is a minimum of one foot above the base flood elevation. (2) All new and substantially improved factory-built homes, including those placed in existing factory-built home parks or subdivisions, shall be anchored to resist flotation, collapse, or lateral movement. Anchorage systems may include, but are not limited to, use of over-the-top or frame ties to ground anchors as required by the State Building Code. F. Utility and Sanitary Systems: (1) On-site waste disposal and water supply systems shall be located or designed to avoid impairment to the system or contamination from the system during flooding. (2) All new and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system as well as the discharge of effluent into flood waters. Wastewater treatment facilities (other than on-site systems) shall be provided with a level of flood protection equal to or greater than one foot above the base flood elevation. (3) New or replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system. Water supply treatment facilities (other than on-site systems) shall be provided with a level of protection equal to or greater than one foot above the base flood elevation. (4) Utilities such as gas or electrical systems shall be located and constructed to minimize or eliminate flood damage to the system and the risk associated with such flood damaged or impaired systems. G. Storage of Equipment and Materials. Storage of equipment and materials that are flammable, explosive, or injurious to human, animal, or plant life is prohibited unless elevated a minimum of one foot above the base flood elevation. Other material and equipment must either be similarly elevated or: (1) Not subject to major flood damage and anchored to prevent movement due to flood waters; or (2) Readily removable from the area within the time available after flood warning. H. Flood Control Structures. Flood control structural works such as levees, flood walls, etc. shall provide, at a minimum, protection from the base flood with a minimum of three feet of design freeboard and shall provide for adequate interior drainage. In addition, the Department of Natural Resources shall approve structural flood control works. cty_hr_d_160.doc - 11 - 4/15/2021