Chapter 27 Flood Plain Management

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§ 27-12 HAWAII COUNTY CODE "Variance" means a grant of relief from the requirements of this chapter which permits construction in a manner that would otherwise be prohibited by this chapter. "Violation" means the failure of a structure or other development to be fully compliant with the community's floodplain management regulations. A structure or other development without the elevation certificate, other certifications, or other evidence of compliance with this chapter is presumed to be in violation until such time as that documentation is provided. "Water surface elevation" means the height, in relation to the National Geodetic Vertical Datum of 1929, (or other datum, where specified) of floods of various magnitudes and frequencies in the floodplains of coastal or riverine areas. "Watercourse" means a lake, river, creek, stream, wash, arroyo, channel, or other topographic feature on or over which waters flow at least periodically. Watercourse includes specifically designated areas in which substantial damage may occur. "Zone A" is the special flood hazard area that corresponds to the one hundred -year floodplains that are determined in the Flood Insurance Study by approximate methods. Because detailed hydraulic analyses are not performed for such areas, base flood elevations or depths have not been determined within this zone. "Zone A99" is the special flood hazard area where enough progress has been made on a protective system, such as dikes, dams, and levees, to consider it complete for insurance rating purposes. Base flood elevations have not been determined for areas designated as Zone A99. "Zone AE" is the special flood hazard area that corresponds to the one hundred -year floodplains that are determined in the Flood Insurance Study by detailed methods. Whole -foot base flood elevations derived from the detailed hydraulic analyses have been determined at selected intervals within this zone. "Zone AH" is the special flood hazard area that corresponds to the areas of one - hundred -year shallow flooding (usually areas of ponding) where average depths are between one and three feet. Whole -foot base flood elevations derived from the detailed hydraulic analyses have been determined at selected intervals within this zone. "Zone AO" is the special flood hazard area that corresponds to the areas of one - hundred -year shallow flooding (usually sheet flow on sloping terrain) where average depths are between one and three feet. Average whole -foot depths derived from the detailed hydraulic analyses have been determined within this zone. "Zone D" corresponds to unstudied areas where flood hazards are undetermined, but possible. "Zone V" is the special flood hazard area that corresponds to the one hundred -year coastal floodplains 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. It is an area subject to high velocity waters, including coastal and tidal inundation or tsunamis. Base flood elevations have not been determined for areas designated as Zone V. 27-12