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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 Farms 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 IRFWCD discharge rate. In this case, the minimum floor elevation level of service standards do not apply, since the property does not lie within a floodplain. However, both the on-site retention and discharge standards apply. With the most intense use of this site under the proposed amendment, the maximum area of impervious surface would be approximately 858,132 square feet, or 19.7 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, would be approximately 926,461 cubic feet. In order to maintain the county's adopted level of service, the applicant would be required to retain approximately 706,129 cubic feet of runoff on-site. With the soil characteristics of the subject property, it is estimated that the pre -development runoff rate is 245.29 cubic feet/second. Based upon staff's analysis, the drainage level of service standard would be met by limiting off-site discharge to the IRFWCD's maximum discharge rate of two inches in twenty-four hours, and requiring retention of the 706,129 cubic feet of runoff for the most intense use of the property. 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 amendment 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 by park type. LOS Project (Acres per Demand Surplus Park Type 1000 population) Acres Acreaae Urban District 5.0 2.79 170.661 Community (north) 3.0 1.67 15.895 Beach 1.5 0.84 61.598 River 1.5 0.84 22.595 Based upon 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 amendment. Therefore, the concurrency test has been satisfied for the subject request. Impact on the Residential Allocation Ratio Of particular importance to this request is the impact of the land use change on the county's Residential Allocation Ratio (RAR). A RAR is the measure of total residential units allowed under the land use plan compared to the number of residential units expected to be needed through the plan's planning horizon, based on Population projections. In 1990, when the comprehensive plan was adopted, the plan allowed over 119,000 units. In this case, the proposed amendment would increase the maximum number of residential units allowed on the site by 76. That increase would have an insignificant impact on the county's=RAR. More than off -setting the 76 unit increase that would occur with the proposed amendment is the reduction in build -out units that has resulted from land use plan amendment approvals since plan adoption. Since plan adoption, several land use amendments NOVEMBER 12, 1996 57 BOOK 99 PACE 722