COM 0176.139 2006-2008 - Laserfiche WebLink

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JUL 13 20C7 10:30flM ROTH KIMURR LLP 808 324 6078 p.5 July 11, 2(NY7 Cuunty of Hawaii - ei(I 51, (haft #5 Page 5 of ti det<:rmine what types of information will be required for submittal. Only the Federal government has jurisdiction over re-mapping. We recommend that until this Federal mapping is ctlmpleted a process of determining edges of potential floodways within the Zone X and Zone X shaded by the Department of Public Works should be best determined by prol essionals lrnowledgeable in hydrology and codes. Item #5 See page 4 Section 27-4. Scope and methods. ~1) Reuuire new subdivisions and developments to mitieate the difference between the pre-development dischar¢e amount and the post-development discharEe amount based on the expected one-hoar, 25-veer storm event. The standard created by this subsection shall prevail until such time that the Department of Public Works "Storm Draina¢e Standards", dated October 1970. or env approved revision, is amended to conform to either the ernected one•honr, 25-veer storm event or to a higher standard if required by the floodplain administrator or this chapter. If there is a conflict between this chapter and env other chapter, the more restrictive standard shall spply; We recommend that all of (j) be deleted. We understand that the basis for this proposed ordinance is that there are some counties in California that arc using the 25 year ape-hour stoma event as their standazd. We also know that the geology of California and the Big Island are very different. A study should consider geology, pedology, meteorology, botany, topo~•aphy and history of flooding spedfically on the Big Island. We recommend that this proposed change be studied cazefully. A public presentation of impacts and cost-benefit anal~~sis as a result of the study needs to be shared with the public before enacting legislation as w-itten above. Itern #6. See Page 18 Section 27-16. Duties and responsibilities of the floodplain administrator. The floodplain administrator, with the cooperation and assistance of other County depa-tments, shall administer this chapter- The duties and responsibilities of the floodplain adtinistrator or designatedpersonts) shall include, but not be limited to: We recommend that " or desi tgttat_ed person(s)" be deleted. We also recommend that the "flood plain administrator" be a civil engineer, licensed in the State of Hawaii. We believe this is a necessary qualification for this job as he/she will have Beat discretionary powers. This qualification should be included in the ordinance. Item #7. See Page 25 Section 27-18. Standards for constriction. Standads for construction within areas of special flood hazards aze established as follows: (c) Filling. u Within areas where the grade oC the natural elevation of the wound surface prior to construction exceeds ten~ercent. fillin¢, eradine, and other develonment_which may P.O. Box 624 Holualoa, HI 96725 808-987-6146 ]cimuta@alum.mit.edu