Multi-Hazard Mitigation Plan: 10. Floods

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Chapter-10 Appendix T'LOODPLAiN MANAGEMENT §27-12 manufactured home on a foundation.Permanent construction does not include land preparation,such as clearing.grading and filling;nor does it include the installation of streets and/or walkways:nor does it include excavation for a basement, (outings,piers,or foundations,or the erection of temporary forms; nor does it include the installation on the property of accessory buildings.such as garages or sheds not occupied as dwelling units or not part of the main structure.For a substantial improvement,the actual start of construction means the first alteration of any wall,coiling,floor.or other structural pail of a building,whether or not that alteration affects the external dimensions of*the building. "State`tream fire State of l lawai`i. -Structure" moans a walled and motod building, including a gas or liquid storage lank, that is principally above ground,as well as a manufactured home. "Substantial damage"means damage of any origin sustained by a structure whereby file cost of restoring the structure to its before damaged condition would equal ur exceed fifty percent of the market value of the structure before the damage occurred. "Substantial improvement." For the purposes of this chapter, the determination of whelhcr any improvements constitute substantial improvements is applicable only to structures built prior to May 9, 1982 or buildings constructed after May 5.1982 which were not within a special flood hazard area at the time of issuing the building permiL "Substantial improvement" means any repair,reconstruction. rehabilitation.addition,or other proposed new development of a structure,the cost of which equals or exceeds Cully percent of the market value of the structure before the -start of construction" of the improvement which shall be die stint of all costs of all such work performed in the previous ten years including the cost of the current work being considered.The value of the structure including previous ten year improvements,shall be certified by a contractor,engineer,or architect licensed by the State and the property owner as may be required on a form provided by the County. 11tis term includes structures which have incurred"substantial damage,"regardless of the actual repair work performed. The term does not,however,include either: (1) Any project for improvement of a structure to correct existing violations of stale or local health,sanitary,or safety coda specifications which have been identified by the local code enforcement oOicial and which are the minimum necessary to assure safe living conditions;or (2) Any alteration of a `historic structure;' provided that the alteration will not proclnde,the tructure's continued designation as a"historic structure." "Variance"means a grant ofrehof from the roquu•ements 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 Cully 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 providcd- "Water surface elevation"means the height,in relation to the National geodetic Vertical Datum at' 1929. (or other datum, when: specified) of floods of various magnitudes and frequencies in the floodplairis of coastal or riverine areas. "Watercourse" means a lake, river, creek. stream, wash, arroyo,channel. or other topographic feature on or over which water;flow at least periodically.Watercourse includes specifically designated arias 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 hood 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 tar insurance rating purposes.Base flood elevations have not been determined for areas designated as Zone A99, "Zone AG"is the special flood hazard area that corresponds In the one hundred-year floodplains that are determined in the Hood Insurance Study by detailed methods.Whole-fool base flood elevations 27-9 SUPP,5 (1-2008) 10A-11 Hawaii County Multi-Hazard Mitigation Plan