Sec. 86-551, Sec. 86-567, Sec. 86-568

Floodplain

• Maximum floor area for accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structures in SFHA600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Be limited to no more than 600 square feet in total floor area;

• Use restriction for accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structures in SFHA

  Not be used for human habitation; ... Be useable only for parking of vehicles or limited storage;

• Maximum area for accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure varianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship.600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  No variance shall be granted for an accessory structure exceeding 600 square feet.

• Prohibition on variances for accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structures in SFHA

  Variances will not be issued for any accessory structure within the SFHA.

• Elevation requirement in coastal high hazard areas

  New construction and substantial improvement of any structure in a coastal high hazard area (Zone V, VE, or V1-V30) shall: (1) Be elevated on pilings or columns so that the bottom of the lowest horizontal structural member of the lowest floor is at or above the flood protection elevation; and (2) Have no fill used for structural support.

• Use of enclosed areas below regulatory flood protection elevation

  Not be designed or used for human habitation, but shall only be used for parking of vehicles, building access, or limited storage of maintenance equipment used in connection with the premises.

• Maximum heightMaximum heightThe tallest a building may be, given in feet, in storeys, or both — whichever binds first. of flood opening bottom above grade1 ft

  The bottom of all required openings shall be no higher than one foot above the adjacent grade.

• Flood opening requirements for enclosed areas1 sq in per sq ftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  The total net area of all openings must be at least one square inch for each square foot of enclosed area subject to flooding...

• FloodplainFloodplainLand expected to flood at a stated frequency, where building carries extra conditions. development permit required

  No person shall commence any development in a special flood hazard area without first obtaining a floodplain development permit from the floodplain administrator.

• Floodproofing elevation for nonresidential structures2 ft above BFE

  Buildings located in all AE zones may be floodproofed in lieu of being elevated provided that all areas of the building components below the elevation corresponding to the base flood elevation (BFE) plus two feet are watertight...

• Prohibition on development in floodway without analysis

  No new construction, substantial improvement, or other development, including fill, shall be permitted within the floodway unless it has been demonstrated through hydrologic and hydraulic engineering analyses... that the proposed development will not result in any increase in the one-percent annual chance flood elevations.

• Lowest floor elevation for nonresidential structures18 inches above BFE

  New construction or substantial improvement of any commercial, industrial, or nonresidential building (or manufactured home) shall have the lowest floor, including basement, elevated to or above 18 inches above the base flood level.

• Lowest floor elevation for residential structures18 inches above BFE

  New construction or substantial improvement of any residential structure (including manufactured homes) in zones AE and A with detailed base flood elevations shall have the lowest floor, including basement, elevated to the base flood elevation plus 18 inches.

• Manufactured homeManufactured homeA dwelling built in a factory to a federal standard and transported to the site. anchoring requirement

  Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement.

• Maximum consecutive days for recreational vehicle on site180 days

  Be on the site for fewer than 180 consecutive days, be fully licensed and ready for highway use...

• Base flood elevation data required for subdivisions

  All subdivision proposals located within special flood hazard areas shall have base flood elevation data provided.

• Threshold for substantial improvement50 pct of market value

  Any modification, alteration, repair, reconstruction, or improvement of any kind to a structure and/or use, regardless of its location in a floodplain area to an extent or amount of 50 percent or more of its market value, shall be undertaken only in full compliance with this article...

• Lot size limit for variances0.5 acreacre43,560 square feet — about the size of an American football field without the end zones.

  Variances may be issued by the board of zoning appeals for new construction and substantial improvements to be erected on a lot of one-half acre or less in size contiguous to and surrounded by lots with existing structures constructed below the base flood level...