Chapter 27 Flood Plain Management

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§ 27-16 HAWAII COUNTY CODE confirmation of those physical changes affecting flooding conditions, risk premium rates and floodplain management requirements will be based upon current data. (6) Using other base flood data. When base flood elevation data has not been provided in accordance with section 27-6, the floodplain administrator shall obtain, review, and reasonably utilize any base flood elevation and floodway data available from a Federal or State agency, or other source, in order to administer article 4. Any such information shall be submitted to the floodplain administrator for consideration. (7) Whenever a watercourse is to be altered or relocated: (A) Require that the flood carrying capacity of the altered or relocated portion of said watercourse is maintained; (B) For riverine situations, notify the State of Hawaii department of land and natural resources (commission on water resource management) and all adjacent property owners, prior to such alteration or relocation of a watercourse, and submit evidence of such notification to the Federal Emergency Management Agency; and (C) Whenever a proposed alteration or relocation occurs that would significantly change the base flood elevation or result in a mappable alteration of the boundaries of any special flood hazard area, technical and scientific data through the Conditional Letter of Map Revision shall be submitted to and approved by the Federal Emergency Management Agency. Such a submission is necessary so that upon completion of those physical changes affecting flooding conditions, risk premium rates and floodplain management requirements will be based upon current data. Work to be performed under an approved Conditional Letter of Map Revision shall be subject to the following: (i) Work shall not begin on any on-site development affecting or impacting the floodplain until an approved Conditional Letter of Map Revision is received from the Federal Emergency Management Agency; and (ii) Within sixty days of receiving final approval from the floodplain administrator for the completion of the alteration or relocation of a watercourse, the request for a Letter of Map Revision, and all other information required by the Letter of Map Revision process shall be submitted to the Federal Emergency Management Agency. (8) Violations. Take action to remedy violations of this chapter as specified in article 6. (1993, ord 93-78, sec 3; am 2001, ord 01-108, sec 1; am 2007, ord 07-169, sec 9; am 2017, ord 17-56, sec 8; am 2018, ord 18-25, sec 3.) SUPP. 4 (7-2018) 27-16