(A) Permitted uses. The following uses shall be permitted uses within the Floodplain District as delineated on the city's FIRM, provided they are not prohibited by any other code provision:
(1) Agricultural uses not involving a structure, such as: general farming, pasture, grazing, outdoor plant nurseries, horticulture, viticulture, truck farming, forestry, sod farming, and wild crop harvesting.
(2) Any use of land which does not involve a structure, an addition to the outside dimensions to an existing structure, or an obstruction to flood flows such as fill, excavation, or storage of materials or equipment.
(3) Loading areas and parking areas.
(4) Private and public recreational uses not involving a structure, such as: tennis courts, picnic grounds, boat-launching ramps, swimming areas, parks, wildlife and nature preserves, game farms, fish hatcheries, hunting and fishing areas, hiking and horseback-riding trails.
(5) Residential uses not involving a structure, such as: lawns, gardens, parking areas and play areas.
(B) Conditional uses. The following uses shall only be permitted by conditional use permit in the Floodplain (FP) District as delineated on the city's FIRM, provided they are not prohibited by any other code provisions:
(1) Clean earth fill to elevate the lowest floor of newly constructed buildings, and all alterations and additions to these buildings, in the flood fringe area above the regulatory flood protection elevation.
(2) Clean earth fill to elevate the lowest floor of existing buildings, and all alterations and additions to these building, in the flood fringe above the regulatory flood protection elevation.
(3) Gravel mining and other earth-material-extraction operations.
(4) Storage of equipment and materials.
(5) Roads, bridges and associated fill, subject to meeting minimum state standards set by the DNR and MNDOT.
(C) Prohibited uses. The following uses shall be prohibited in the Floodplain (FP) District:
(1) The placement of new or used building structures in the floodway area, including residential structures. New residential subdivisions are also prohibited in the Floodplain (FP) District.
(2) Travel trailer or travel vehicle parks or campgrounds shall not be permitted in the Floodplain (FP) District.
(3) Manufactured homes placed on individual lots or parcels of record and new manufactured home parks shall not be permitted in the Floodplain (FP) District.
(D) Standards for floodplain uses. The following standards shall be met for any use in the Floodplain (FP) District:
(1) Storage of material and equipment.
(a) The storage or processing of materials that are, in time of flooding, flammable, explosive, toxic or potentially injurious to human, animal, or plant life is prohibited.
(b) The storage of other materials or equipment may be allowed if readily removable from the area within the time available after a flood warning.
(2) Obstructions. No uses shall be permitted or issued a conditional use permit that will adversely affect the capacity of the channels or floodway of any main stream, or any of its tributaries, or of any drainage ditch or any other drainage facility or system, unless it is a flood control or conservation project approved by the DNR.
(3) Parking lots and public access. Accessory land uses, such as railroad yards, public access and parking lots, may be at elevations lower than the regulatory flood protection elevation. However, a conditional use permit for such facilities, to be used by the employees or the general public, shall not be granted in the absence of a flood warning system that provides adequate time for evacuation if the area would be inundated to a depth greater than two feet, or would be subject to flood velocity greater than four feet per second upon occurrence of the regional flood.
(4) On-site individual sewage treatment and private water supply systems. Where public utilities are not provided, and in accordance with all state and federal regulations for floodplain areas: (a) on-site water supply systems must be designed to prevent infiltration of floodwaters into the systems; and (b) new replacement on-site individual sewage treatment systems must contain check valves or other devices designed to minimize or eliminate infiltration of floodwaters into the systems and discharges from the systems into floodwaters, and they shall not be subject to impairment or contamination during times of flooding. Any sewage treatment system designed in accordance with the state's current statewide standards for on-site sewage treatment systems (Rule 7080) shall be determined to be in compliance with this section.
(5) Elevation of structures on fill to the regulatory flood protection elevation. All structures, including accessory structures, must be elevated on fill so that the lowest floor, including basement floor, is at or above the regulatory flood protection elevation. The finished fill elevation for structures shall be no lower than one foot below the regulatory flood protection elevation, and the fill shall extend at such elevation at least 15 feet beyond the outside limits of the structure erected thereon
(6) Utilities, railroads, roads and bridges. All utilities and transportation facilities, including railroad tracks, roads and bridges, shall be constructed in accordance with state floodplain management standards contained in Minnesota Rules.
(7) Protection from erosion. Fill and all other similar materials deposited or stored in the floodplain shall be protected from erosion by vegetative cover, mulching, riprap or other acceptable method.
(Ord. 927, passed 10-27-11)