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CarriprcheniOvePlay i SIlormwalerMar ageimenl 'Sub-Elament <br />EXISTING CONDITION S1 <br />Located within the Guafland Atlantic Coastal Plains ofllha Unitad States, Indian River County has a <br />low and flat coastall platin lapagraphy. Wilhin thea aounty, there is a ncirlh-south banding cif <br />physiographic reigions orientac approximalely paraalel to thea Atlantic Occiani. Two rcigians ofllow <br />relief, tha Elastern `ialleay and Iha C central Malllay, ciarriprisci must of this area. 11hraughout most of ills <br />aourse, the Si. Johns River allang with lhei Atllanitici Coastall Sand Rldgci separalei the Eastern Valley <br />from thlei Atlantia Oaean. Approximateily H% oflthlci county consists ciflmarshllands. <br />Toplograpliy and f hysiugnapliy <br />Generally, Indian Rivar County is an area of low rellief representing several ariaianl rnaninie tarraces, <br />each marking the ocean bottomi al limas whlan tha sea ]lavel was al a hiElhar alevalioni. Two tarraces, <br />thea Aamhicio Tearrace avid tha Talbal Temiaca, traversa tha ciounaty. Covering the area from tha coast <br />inland abaul :I4 miles to thea western edgci of the St. Johns Marsh, thea Plarrdico Tearraae is mostly less <br />than 25 feal above sea laved. The lenaaaa :is broken by threca distinct ridges. These ridgeas arae: the <br />Coastal Barriar Island, tha Atlantic Coastall Sand Rlidga, and tha Tan Mile Ridge. A dditionaal <br />infarmaation ragarding the topadraphy and phlysiography oflIddian River C aunty :is containac :in the <br />C anseniati(in Elamiant. <br />Coastal Banricr Island <br />The aaslernmosl r:idgca is thea Barn:icar Island. glhat ridEla is the prcascant beach arcaa of the ciounq and <br />visas to appraximiatedy 20 fecrt above sea level. Bcahind thea Barn:icar Island liens the shallow Indian <br />River Bagoan (IRL). <br />At] antic Coasil a 1 Sa nd Ridge <br />Approximataly one-half Ito orae -male wast of the IRI.I lies the Atlantic C aastall Sand Ridga. Thal ridge <br />is ovarla:in by tha Illarida East Coast Railroad (AEICRRI) and U.S. Highway #11. "Ilha ridge Has a <br />hlistoraic maximum hleighlt oft approximatelly 34 fbet, but savaral places along tha ridge hava been <br />raeducad in alavatian dua to excavation associated with sand minting and devealopment. <br />Ten Mile Hidga <br />Known ]anally as thle Ten Mile Ridge, this r:idga is ovarlain bythea Intarslata 95 corridor. Ara -dating <br />tha Atlantia Coastal Sand Ridge, tha Ten M:ila Ridgca has a maximum height aflapproximatealy 3-I <br />feat. Both r:idgas aonlribute to thea raeciharge oflthle surfiaial graundwatar aquiftir. <br />Comrnumityl Ele-telopIment Dcpartment Indian River Clauntyl <br />