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0 D. 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 site is located within the R-4 Drainage Basin. 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 36,590 square feet, or 0.84 acres. The maximum runoff volume, based on that amount of impervious surface and the 25 year/24 hour design storm would be approximately 49,169 cubic feet. In order to maintain the county's adopted level -of -service, the applicant would be required to retain approximately 19,225 cubic feet of runoff on-site. With the soil characteristics of the subject property, the estimated pre -development runoff rate is 6.69 cubic feet/second. Based upon staffs analysis, the drainage level -of -service standards will be met by requiring retention of the 19,225 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 Recreation concurrency requirements apply only to residential development. Therefore, this Comprehensive Plan amendment/rezoning request would not be required to satisfy recreation concurrency requirements. Based upon the analysis conducted, staff has determined that all concurrency -mandated facilities, including drainage, roads, solid waste, wastewater, and water have adequate capacity to accommodate the most intense use of the subject property under the proposed land use designation. Therefore, the concurrency test has been satisfied for the subject request. Comprehensive Plan amendment requests are reviewed for consistency with all policies of the Comprehensive Plan. As per section 800.07(1) of the County Code, the "Comprehensive Plan may only be amended in such a way as to preserve the internal consistency of the plan pursuant to Section 163.3177(2)F.S.." Amendments must_also show consistency with the overall designation of land uses as depicted on the Future Land Use Map, which includes agricultural, residential, recreational, conservation, and commercial and industrial land uses and their densities. The goals, objectives, and policies are the most important parts of the Comprehensive Plan. Policies are statements in the plan that identify the actions which the county will take in order to direct the community's development. As courses of action committed to by the county, policies provide the basis for all county land development decisions. While all Comprehensive Plan policies are important, some have more applicability than others in reviewing plan amendment requests. Of particular applicability for this request are the following objectives and policies: Future Land Use Policy 14.3 The most important policy to consider in evaluating a plan amendment request for consistency with the county's Comprehensive Plan is Future Land Use Element Policy 14.3. This policy requires that one of four criteria be met in order to approve a land use amendment request. These criteria are: a mistake in the approved plan; an oversight in the approved plan; a substantial change in circumstances affecting the subject property; or September 22, 1998 45 • BOOK107 PAGE i