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BOOK 9 PGS - 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. The subject property is located within the M-1 Drainage Basin and the Indian River Farms Water Control District (IRFWCD). Since the site is located within the IRFWCD, development on the property will be prohibited from discharging any runoff in excess of two inches in a 24 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 do apply. With the most intense use of this site under the proposed zoning, the maximum area of impervious surface will be approximately 405,544 square feet, or 9.3 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 411,820 cubic feet. In order to maintain the county's adopted level of service, the applicant will be required to retain approximately 315,262 cubic feet of runoff on-site. Considering the soils characteristic of the subject property, staff estimates that the pre -development runoff rate is 75 cubic feet/second. Based upon staff's 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 24 hours, and requiring retention of 315,262 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 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 by park type. 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 zoning. Therefore, the concurrency test has- been_ satisfied for the subject request. APRIL 4, 1995 40 s LOS Project .-JAcres per Demand Surplus Park Type 1000 population) Acres Acreage Urban District 5.0 1.22 189.844 Community (north) 3.0 0.73 19.843 Beach 1.5 0.37 67.353 River 1.5 0.37 28.350 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 zoning. Therefore, the concurrency test has- been_ satisfied for the subject request. APRIL 4, 1995 40 s