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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>J.F. Turner Jr.</dc:contributor>
  <dc:contributor>W. R. Murphy Jr.</dc:contributor>
  <dc:creator>K.M. Hammett</dc:creator>
  <dc:date>1978</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Myakka River is a coastal stream that drains approximately 550 square &lt;/span&gt;&lt;span&gt;miles in southwest Florida. Under natural conditions, Tatum Sawgrass, a &lt;/span&gt;&lt;span&gt;large depression, served as a flood overflow area for the upper part of &lt;/span&gt;&lt;span&gt;the Myakka River basin. A recently constructed (1974) dike system across &lt;/span&gt;&lt;span&gt;the lower part of Tatum Sawgrass has reduced previously available storage, &lt;/span&gt;&lt;span&gt;thereby affecting downstream flooding. &lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span&gt;An evaluation of the effects of Tatum Sawgrass dikes on flooding indi-cates that flood-peak discharges and flood heights having recurrence inter-vals of up to 25 years are increased. As a result, about 1,200 additional acres along Myakka River main stem may be inundated during 2-year flood conditions. Maximum effects include a 19 percent increase in flood-peak discharge at State Road 780 and a 0.8 foot increase in flood height near the downstream end of the study reach. &lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span&gt;Floods having recurrence intervals of 50 years or greater will over-top dikes and the storage capacity of Tatum Sawgrass will revert to natural condition capacity. &lt;/span&gt;&lt;/p&gt;&lt;p&gt;&lt;span&gt;As part of the evaluation, diked condition flood profiles, having recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years were determined for the nontidal part of a 45-mile reach of Myakka River main stem, Clay Gully, and Blackburn Canal. These data indicate that Clay Gully flood water will overflow embankments at State Road 780 during the 2-year flood and will overflow the bridge on State Road 780 during the 25-year flood. Myakka River flood water will overflow embankments at State Road 72 and Border Road during 100-year flood conditions and at State Road 780 during 500-year conditions. &lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/wri7865</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Magnitude and frequency of flooding on the Myakka River, Southwest Florida</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>