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10/16/23, 10:01 AM Print Preview https://lakeelmo.municipalcodeonline.com/book/print?type=ordinances&name=TITLE_100_FLOODPLAIN_MANAGEMENT 8/19 floodproofing must meet the FP-1 or FP-2 floodproofing classification in the state building code and this shall require making the structure watertight with the walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and the effects of buoyancy. Structures floodproofed to the FP-3 or FP-4 classification shall not be permitted. (4)When at any one time more than 1,000 cubic yards of fill or other similar material is located on a parcel for such activities as on-site storage, landscaping, sand and gravel operations, landfills, roads, dredge spoil disposal or construction of flood control works, an erosion/sedimentation control plan must be submitted consistent with LEC 105.04.740 and LEC 105.04.770. The plan must be prepared and certified by a registered professional engineer. (5)Storage of materials and equipment. a.The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life is prohibited. b.Storage of other materials or equipment may be allowed if readily removable from the area within the time available after a flood warning and in accordance with a plan approved by the city prior to the placement of any materials or equipment within the flood fringe district. (6)The provisions of subsection (e) of this section shall also apply. (e)Standards for all flood fringe uses. (1)All new principal structures must have vehicular access at or above an elevation not more than one foot below the regulatory flood protection elevation. If a variance to this requirement is granted, the board of adjustment must specify limitations on the period of use or occupancy of the structure for times of flooding and only after determining that adequate flood warning time and local flood emergency response procedures exist. (2)Commercial uses. Accessory land uses, such as yards, railroad tracks, and parking lots, may be at elevations lower than the regulatory flood protection elevation. However, a 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 and velocity such that when multiplying the depth (in feet) times velocity (in feet per second) the product number exceeds four upon occurrence of the regional flood. (3)Manufacturing and industrial uses. Measures shall be taken to minimize interference with normal plant operations especially along streams having protracted flood durations. Certain accessory land uses such as yards and parking lots may be at lower elevations subject to requirements set out in subsection (e)(2) of this section. In considering permit applications, due consideration shall be given to needs of an industry whose business requires that it be located in floodplain areas. (4)Fill shall be properly compacted and the slopes shall be properly protected by the use of riprap, vegetative cover or other acceptable method. The Federal Emergency Management Agency (FEMA) has established criteria for removing the special flood hazard area designation for certain structures properly elevated on fill above the 100- year flood elevation. FEMA's requirements incorporate specific fill compaction and side slope protection standards for multi-structure or multi-lot developments. These standards should be investigated prior to the initiation of site preparation if a change of special flood hazard area designation will be requested.