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BOOK MG PAGE 037 - 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. Any development on the subject property will be prohibited from discharging any runoff in excess of the pre-ueveioprueut gate. In this case, the minimum floor elevation level of service standard applies, since the property lies within an AE flood zone, as designated on the Federal Emergency Management Agency's Flood Insurance Rate Map. Consistent with Stormwater Management Sub -Element Policy 1.2 and section 930.07(2) of the county's LDRs, any new buildings constructed within an AE flood zone "must be elevated a minimum of six inches above the base flood level." Since the subject property lies within Flood Zone AE -9, any development on this property must have a minimum finished floor elevation of no less than 9.5 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 classifications will be approximately 1,278,050 square feet, or 29.34 acres. The estimated runoff volume, based on that amount of impervious surface and the 25 year/24 hour design storm, will be approximately 1,405,912 cubic feet. In order. to maintain the county's adopted level of service, the applicant will be required to retain approximately 344,275 cubic feet of runoff on-site. With the soil characteristics of the subject property, it is estimated that the pre -development runoff rate is 230.41 cubic feet/second. Based upon staffs analysis, the drainage level of service standards will be met by limiting off-site discharge to its pre -development rate of 230.41 cubic feet/second, requiring retention of 344,275 cubic feet of runoff for the most intense use of the property, and requiring that all finished floor elevations exceed 9.5 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 property under the proposed zoning classification indicates that the adopted levels of service would be maintained. The table below illustrates the additional park demand associated with the proposed development of the property and the existing surplus acreage. Park Information LOS (Acres per 1,000 Population) Project Demand (Acres) Surplus Acreage 4.0 2.70 838.5 Based on the analysis conducted, staff has determined that all concurrency -mandated facilities, including drainage, roads, solid waste, recreation, water, and wastewater, have adequate capacity to accommodate the most intense use of the subject property under the proposed zoning district. Therefore, the concurrency test has been .satisfied for the subject request. Rezoning requests are reviewed for consistency with all policies of the comprehensive plan. Rezoning requests must also be consistent with the overall designation of land uses as depicted on August 25, 1998 42 0 0