Agenda - Environmental Policy Board - 09/21/2015

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2. That the enclosed area will be designed of flood resistant materials in accordance with the FP -3 or FP -4 classifications in the state building code and shall be used solely for building access, parking of vehicles or storage. (2) Basements, as defined in section 117-1, shall be subject to the following: a. Residential basement construction shall not be allowed below the regulatory flood protection elevation. (3) b. Nonresidential basements may be allowed below the regulatory flood protection elevation provided the basement is structurally dry floodproofed in accordance with subsection (d)(3) of this section. All areas of nonresidential structures including basements to be placed below the regulatory flood protection elevation shall be floodproofed in accordance with the structurally dry floodproofing classifications in the state building code. Structurally dry 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 unless the community is enforcing a state -approved shoreland management ordinance. In the absence of a state -approved shoreland ordinance, the plan must clearly specify methods to be used to stabilize the fill on site for a flood event at a minimum of the 100 -year or regional flood event. The plan must be prepared and certified by a registered professional engineer or other qualified individual acceptable to the city council. The plan may incorporate alternative procedures for removal of the material from the floodplain if adequate flood warning time exists. 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 council. (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 two feet 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 greater than two feet or be subject to flood velocities greater than four feet per second upon occurrence of the regional flood. 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 (5) (3) Page 6