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7.M. REGATTA CONSTRUCTION LLC - FLOODPLAIN CUT AND FILL BALANCE WAIVER FOR RIVER WIND SUBDIVISION The Board reviewed a Memorandum of July 23, 2002: TO: James Chandler, County Administrator THROUGH: James W. Davis, P.E., Public Works Directo ' L CONSENT AGENDA AND Chnstopher J. Kafer, Jr., P.E., County Engine f FROM: David B. Cox, P E , Senior Civil Engineeia SUBJECT: Request for Floodplain Cut and Fill Balance Waiver for Riverwind Subdivision REFERENCE: SD -02-06-11 / LDP Application No. 2002020080-31658 DATE: July 23, 2002 DESCRIPTION AND CONDITIONS Masteller & Moler, Inc , on behalf of Regatta Construction, LLC, the developer of Riverwind Subdivision has requested a waiver of the cut and fill balance requirement of Section 930.07(2)0) of the Stonnwater Management and Flood Protection Ordinance Riverwind Subdivision received preliminary plat approval from the Planning & Zoning Commission on April 25, 2002. The project is located at the southeast comer of Indian River Boulevard and 45th Street The site is located in special flood hazard area Zone AE with a base flood elevation of 7.0 feet N.G.V.D The ten-year still water elevation is 4.2 feet. The proposed displacement of the floodplain below 4.0 feet for which the waiver is requested is 11.8 acre feet as indicated in the attached letter from the applicant's engineer dated July 2, 2002 ALTERiNATIVES AND ANALYSIS The project meets the cut and fill balance waiver criteria provided in Section 930.07(2)(d)1 of being situated in an estuarine environment within the 100 year floodplain along the Indian River and it appears that all other Stormwater Management and Flood Protection Ordinance requirements can be met without adverse impact on other lands in the estuarine environment. Staff estimates the corrected displacement volume, using the 4 2 foot ten-year elevation required as 15.2 acre feet. by AUGUST 6, 2002