Chapter 12-18: FLOODPLAIN MANAGEMENT - Mason City, Iowa

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structure resulting from hydrodynamic and hydrostatic loads, including the effects ofbuoyancy.c. New and substantially improved structures must be constructed with electrical, heating,ventilation, plumbing, and air conditioning equipment and other service facilities thatare designed and/or located so as to prevent water from entering or accumulatingwithin the components during conditions of flooding.6. FACTORY BUILT HOMES:a. All factory built homes, including those placed in existing factory built home parks orsubdivisions, shall be elevated on a permanent foundation such that the lowest floorof the structure is a minimum of three (3) feet above the base flood level.b. All factory built homes, including those placed in existing factory built home parks orsubdivisions, shall be anchored to resist flotation, collapse, or lateral movement.Methods of anchoring may include, but are not limited to, use of over the top or frameties to ground anchors.7. UTILITY AND SANITARY SYSTEMS:a. On-site waste disposal and water supply systems shall be located or designed to avoidimpairment to the system or contamination from the system during flooding.b. All new and replacement sanitary sewage systems shall be designed to minimize oreliminate infiltration of floodwaters into the system as well as the discharge of effluentinto floodwaters. Wastewater treatment facilities (other than on-site systems) shall beprovided with a level of flood protection equal to or greater than three (3)feet abovethe base flood level elevation.c. New or replacement water supply systems shall be designed to minimize or eliminateinfiltration of floodwaters into the system. Water supply treatment facilities (other thanon-site systems) shall be provided with a level of protection equal to or greater thanthree (3) feet above the base flood level elevation.d. Utilities such as gas or electrical systems shall be located and constructed to minimizeor eliminate flood damage to the system and the risk associated with such flooddamaged or impaired systems.8. STORAGE OF MATERIALS AND EQUIPMENT: Storage of materials and equipment thatare flammable, explosive or injurious to human, animal or plant life is prohibited unlesselevated a minimum of three (3) feet above the base flood level elevation. Other materialand equipment must either be similarly elevated or: a) not be subject to major flooddamage and be anchored to prevent movement due to floodwaters, or b) be readilyremovable from the area within the time available after flood warning.9. FLOOD CONTROL STRUCTURAL WORKS: Flood control structural works such aslevees, floodwalls, etc., shall provide, at a minimum, protection from a base flood with aminimum of six (6) feet of design freeboard and shall provide for adequate interiordrainage. In addition, structural flood control works shall be approved by the Iowadepartment of natural resources.10. WATERCOURSE ALTERATIONS OR RELOCATIONS: Watercourse alterations orrelocations must be designed to maintain the flood carrying capacity within the altered orrelocated portion. In addition, such alterations or relocations must be approved by theIowa department of natural resources.
11. SUBDIVISIONS: Subdivisions (including factory built home parks and subdivisions) shallbe consistent with the need to minimize flood damages and shall have adequate drainageprovided to reduce exposure to flood damage. Development associated with subdivisionproposals (including the installation of public utilities) shall meet the applicableperformance standards of this Chapter. Subdivision proposals intended for residential useshall provide all lots with a means of access that will be passable by wheeled vehiclesduring the base flood. Preliminary and final plats for all new subdivisions shall includebase flood elevation data for those areas located within the floodplain overlay district.12. ACCESSORY STRUCTURES:a. Detached garages, sheds, and similar structures accessory to a residential use areexempt from the base flood elevation requirements where the following criteria aresatisfied:(1.) The structure shall not be used for human habitation.(2.) The structure shall be designed to have low flood damage potential.(3.) The structure shall be constructed and placed on the building site so as to offerminimum resistance to the flow of floodwaters.(4.) The structure shall be firmly anchored to prevent flotation which may result indamage to other structures.(5.) The structure’s service facilities such as electrical and heating equipment shall beelevated or floodproofed to at least three (3) feet above the base flood elevation.b. Exemption from the base flood elevation requirements for such a structure may resultin increased premium rates for flood insurance coverage of the structure and itscontents.13. RECREATIONAL VEHICLES:a. Recreational vehicles are exempt from the requirements of Chapter 12-18-13B-6regarding anchoring and elevation of factory built homes when the following criteriaare satisfied:(1.) The recreational vehicle shall be located on the site for less than one hundredeighty (180) consecutive days, and(2.) The recreational vehicle must be fully licensed and ready for highway use. Arecreational vehicle is ready for highway use if it is on its wheels or jacking systemand is attached to the site only by quick disconnect type utilities and securitydevices and has no permanently attached additions.b. Recreational vehicles that are located on the site for more than one hundred eighty(180) consecutive days or are not ready for highway use must satisfy requirements ofChapter 12-18-13B-6 regarding anchoring and elevation of factory built homes.14. PIPELINE RIVER AND STREAM CROSSINGS: Pipeline river and stream crossings shallbe buried in the streambed and banks, or otherwise sufficiently protected to preventrupture due to channel degradation, meandering, and the action of flood flows.12-18-14 General Floodplain Overlay DistrictA. PERMITTED USES: The following uses shall be permitted within the general floodplaindistrict to the extent they are not prohibited by any other code (or underlying zoning district)
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Chapter 12-18: FLOODPLAIN MANAGEMENT - Mason City, Iowa

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