Chapter 27 Flood Plain Management

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§ 27-20 HAWAII COUNTY CODE (f) Storm water shall be disposed into drywells, infiltration basins, or other approved infiltration methods. The development shall not alter the general drainage pattern above or below the development. (1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 12.) Section 27-21. Standards for manufactured homes. Manufactured homes that are placed or substantially improved on sites outside of a manufactured home park or subdivision, in a new manufactured home park or subdivision, in an expansion to an existing manufactured home park or subdivision, or in an existing manufactured home park or subdivision on which a manufactured home has incurred "substantial damage" as the result of a flood shall: (a) Within Zones AE or AH, be elevated so that either: (1) The lowest floor of the manufactured home is at or above the base flood elevation, or (2) The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than thirty-six inches in height above grade and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement. (b) Within Zone AO, be elevated such that the lowest floor of the manufactured home is elevated at least as high as the depth number specified in feet on the FIRM, or at least two feet if no depth number is specified and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement. (c) Within Zone A, comply with the standards of section 27-24. (d) Within Zones V or VE, comply with the standards of section 27-23. (1993, ord 93-78, sec 3.) Section 27-22. Standards for floodways. The floodway identified on the Flood Insurance Rate Maps and located within areas of special flood hazard is the watercourse reserved to discharge the base flood. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply: (a) Encroachments, including fill, new construction, improvements to repetitive loss structures, substantial improvement, and other new development shall be prohibited unless certification and supporting data is provided by a licensed professional engineer or architect demonstrating that the encroachment will not cause any increase in base flood elevations during the occurrence of the base flood discharge. (b) If an encroachment within a floodway is allowed under the conditions of paragraph 27-22(a), all new construction, improvements to repetitive loss structures, substantial improvement and other proposed new development shall comply with all applicable flood hazard reduction provisions established in this chapter. 27-22