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11 Comprehensive Plan Capital Improvements Element regulations but one or more public facilities is/are operating at an inadequate service level, the applicant may at his expense make facility improvements to increase facility capacity when such improvements are consistent with county plans and receive county approval. Policy 3.4: The county shall make land use decisions based on the planned availability of facilities to maintain adopted level -of -service standards. Policy 3.5: The county hereby adopts Concurrency Management level -of -service standards for public facilities that are established in the other Comprehensive Plan Elements and which are stated below: ➢ Stormwater Management: The county hereby adopts the following level -of -service standard for all new drainage systems within the unincorporated county: ➢ New development requiring major site plan approval or subdivision platting shall construct a complete drainage system to mitigate the impacts of a 25 year/24 hour design rainfall event using the soil conservation service type 2 modified rainfall curves. ➢ Post development runoff for any drainage basin shall not exceed pre -development runoff unless a maximum discharge rate has been adopted and the discharge does not exceed that rate If a maximum discharge rate has not been adopted for a basin, post development discharge may not exceed pre -development discharge. By 2010, all existing roadways in the county shall be improved to meet the following level -of -service standards: ➢ Minimum road crown elevation for existing roads shall be raised during resurfacing/rebuilding to the flood elevation resulting from the 2 year/24 hour storm event on local streets. ➢ The center two lanes of rebuilt roads must be at or above flood levels resulting from a 10 year 24 hour storm event on Arterial and Collector roads. ➢ All drainage basins will meet the following level of service standards: By 2007 5-Year/24 Hour Storm Event By 2010 10-Year/24 Hour Storm Event The county hereby adopts the following water quality level -of -service standard: ➢ As a minimum, retention of the first one inch of rainfall is required prior to offsite discharge. An additional 50% treatment is required for all direct discharge into the Sebastian River and into the Indian River Lagoon due to its designation as an outstanding Florida water, as required by state law. Community Development Department Indian River County Supplement #_; Ordinance 2005- 53