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