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• Drainage All developments are reviewed for compliance with county stormwater regulations which require on-site retention, preservation 'of floodplain storage and minimum finished floor elevations. In addition, development proposals must meet the discharge requirements of the county Stormwater Management Ordinance. Since the site is located within the M-1 Drainage Basin and the Indian River Fames Water Control District (IRFWCD), development on the property will be prohibited from discharging any runoff in excess of two inches in a twenty-four hour period, which is the approved 1RFWCD discharge rate. In this case, the minimum floor elevation level -of -service standard applies, since a portion of the property lies within a floodplain. Consistent with Stormwater Management Sub -Element Policy 12, the finished floor elevation of any new buildings constructed within a floodplain must be elevated a minimum of six inches above the base flood level. Since the subject property lies within Flood Zone AE -22, which is a special flood hazard area located within the 100 -year floodplain, any development on the property must have a minimum finished floor elevation of no less than 22.5 feet above mean sea level. Besides the minimum elevation requirement, on-site retention and discharge standards also apply to this request. With the most intense use of this site, the maximum area of impervious surface under the proposed zoning classification will be approximately 19.8 acres. The maximum runoff volume, based on that amount of impervious surface and the 25 year/24 hour design storm, and given the IRFWCD two inch discharge requirement, will be approximately 868,328 cubic feet. In order to maintain the county's adopted level -of -service, the applicant will be required to retain approximately 628,748 cubic feet of runoff on-site. With the soil characteristics of the subject property, the estimated pre -development runoff rate is 92.43 cubic feettsecond. Based upon staffs analysis, the drainage level -of -service standards will be met by limiting off-site discharge to the IRFWCD's maximum discharge rate of two inches in twenty-four hours, requiring retention of the 628,748 cubic feet of runoff for the most intense use of the property, and requiring that all finished floor elevations exceed 22.5 feet above mean sea level. As with all development, a more detailed review will be conducted during the development approval process. Recreation A review of county recreation facilities and the projected demand that would result from the most intense development that could occur on the subject property under the proposed zoning district indicates that the adopted level of service would be maintained. The following table illustrates the additional park demand associated with the proposed development of the property and the existing surplus park acreage - JUNE 69 2000 -39- " BOOK c� r�GE iz •