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Base flood elevation (BFE) means the Federal Emergency Management Agency- designated 100-year water surface elevation, that has a one percent chance of occurring in anyone year. Base flood/IOO-year flood means a flood that, on the average, is likely to occur once every 100 years (i.e., that has a one percent chance of occurring each year,althollgh the flood may occur in any year). Basement means any area of the building having its floor sub-grade (belowground level) on all sides. Board means the Board of Zoning Appeals established under the provisions of section 40-191 of this Code having authority also to review appeals made by individuals with regard to decisions of the director of permits and inspections or his designee in the interpretation of this chapter. Breakaway wall means a wall that is not part of the structural support of the building and is intended through its design and construction to collapse under specific lateral-loading forces without causing damage to the elevated portion of the building or supporting foundation system. Coastal high-hazard area means an area of special flood hazard extending from offshore to the inland limit of a primary frontal dune along an open coast and any other area subject to high-velocity wave action from storms or seismic sources. Development means any manmade change to improved or unimproved real estate, including, but not limited to, buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations or storage of equipment or materials. Elevated Building/Structure means a non-basement building which has its lowest elevated floor raised above ground level by foundation walls, shear walls, posts, piers, pilings, or columns. Flood means: (1) A general and temporary condition of partial or complete inundation of normally dry land areas from: a. The overflow of inland or tidal waters; b. The unusual and rapid accumulation or runoff of surface waters from any source; or c. Mudslides or mudflows which are proximately caused by flooding as defined in subsection b. of this section and are akin to a river of liquid, flowing mud over normally dry land areas.