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

I. Watercourse Alterations. Watercourse alterations or relocations must be designed to maintain the flood carrying capacity within the altered or relocated portion. In addition, the Department of Natural Resources must approve such alterations or relocations. J. Subdivision. Subdivisions (including factory-built home parks and subdivisions) shall be consistent with the need to minimize flood damages and shall have adequate drainage provided to reduce exposure to flood damage. Development associated with subdivision proposals (including the installation of public utilities) shall meet the applicable performance standards of this chapter. Subdivision proposals intended for residential use shall provide all lots with a means of access which will be passable by wheeled vehicles during the base flood. Proposals for subdivisions greater than five acres or 50 lots (whichever is less) shall include base flood elevation data for those areas located within the Special Flood Hazard Area. K. Accessory Structures to Residential Uses. (1) Detached garages, sheds, and similar structures that are incidental to a residential use are exempt from the base flood elevation requirements where the following criteria are satisfied: [NOTE: Community may choose to instead require any type of accessory structure to comply the elevation requirements as outlined in Section 160.05(1)(C).] a. The structure shall be designed to have low flood damage potential. Its size shall not exceed 600 square feet in size. Those portions of the structure located less than 1 foot above the base flood elevation must be constructed of flood-resistant materials. b. The structure shall be used solely for low flood damage potential purposes such as vehicle parking and limited storage. The structure shall not be used for human habitation. c. The structure shall be constructed and placed on the building site so as to offer minimum resistance to the flow of floodwaters. d. The structure shall be firmly anchored to prevent flotation, collapse, and lateral movement which may result in damage to other structures. e. The structure’s service facilities such as electrical and heating equipment shall be elevated or floodproofed to at least one foot above the base flood elevation. f. The structure’s walls shall include openings that satisfy the provisions of Subsection D(1) of this section. (2) Exemption from the base flood elevation requirements for such a structure may result in increased premium rates for flood insurance coverage of the structure and its contents. L. Recreational Vehicles. Recreational vehicles are exempt from the requirements of Section 160.05(E) regarding anchoring and elevation of factory-built homes when the following criteria are satisfied. (1) The recreational vehicle shall be located on the site for less than 180 consecutive days; and (2) The recreational vehicle must be fully licensed and ready for highway use. A recreational vehicle is ready for highway use if it is on its wheels or jacking cty_hr_d_160.doc - 12 - 4/15/2021