Chapter 27 Flood Plain Management

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§ 27-23 HAWAII COUNTY CODE square foot. Use of breakaway walls which exceed a design safe loading resistance of twenty pounds per square foot may be permitted only if a licensed professional structural engineer certifies that the design proposed meets the following conditions: (A) Breakaway wall collapse shall result from a water load less than that which would occur during the base flood; and (B) The elevated portion of the building and supporting foundation system shall not be subject to collapse, displacement, or other structural damage due to the effects of wind and water loads acting simultaneously on all building components (structural and nonstructural). Maximum wind and water loading values to be used in this determination shall each have a one percent chance of being equaled or exceeded in any given year (one - hundred -year mean recurrence interval). (5) Fill shall not be used for structural support of buildings. (6) Man-made alteration of sand dunes and mangroves which would increase potential flood damage is prohibited. (7) All new construction, improvements to repetitive loss structures, development, and substantial improvement within coastal high hazard areas shall be certified as required by section 27-17. (8) Recreational vehicles placed on sites within Zones V and VE on the FIRM shall be elevated and anchored or be on the site for less than one hundred eighty consecutive days or be fully licensed and highway ready. (1993, ord 93-78, sec 3; am 2007, ord 07-169, sec 14; am 2010, ord 10-115, sec 6; am 2017, ord 17-56, sec 10.) Section 27-24. Standards for general floodplain. The general floodplain, identified as Zone A on the Flood Insurance Rate Maps, are areas of special flood hazards for which detailed engineering studies are not performed by the Federal Emergency Management Agency to determine the base flood elevations and to identify the floodways. (a) To determine base flood elevations and the locations of floodways within the general floodplain, the director of public works may obtain, review, and reasonably utilize any base flood elevation and floodway data available from a Federal, State, or other source, including information requested of a permit applicant. (b) Development or subdivision proposals shall conform with the requirements of section 27-20. (c) The following information shall be provided by a permit applicant to the director of public works to evaluate the proposed construction or improvement site within a general floodplain area: (1) Project location and site plan showing dimensions. (2) Relationship to floodway and floodway fringes as determined by flood elevation study. SUPP. 3 (1-2018) 27-24