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CcuriprehensNe Plani 91ormwvler Maniaigemenil Sub-Elemenit ➢ the malnllanid, coast ofland adjaceanl ala the Ten Mile R'dgcl (I-95) ➢ the mainland, west aflthea Teen Mile Rliic�lel Throughout 11he1 Indian River County arc ei, floods can occur anytime during lhel yelar; howeavelr, they area must frequent during thcl summer season fromi May to October. In Iridian Rivclr Counity, streams and canals in the "inler-ridge" araea (betwiecan thea Ton Mile Ridge near I-95 and thea Atlantic Coastal Sand Ridge near U.S. Hi�lhway 1), cis well as those that discahange into thcl St. Johnls Rlvear, arcs subject to flooding ftom pralorgeld hcieivM rainifaill. Low, swampy inland arcaas (i.ea. palustrincl (freshwater) wetlands' arcs also subjeal to periodic flooding during weat pearioc s. ]In thea eavant of hurricanca ar trapicaaa storm acativiq, aaasilal arenas of thea aour.ity ori the oaclan arcs subjeal la storm surges f aadang. Aaong thcl Indian Rlvclr Llagoon, for eamample, areas may clxpclrieniccl fllaading from stann surge caused by a tropical storm ar hurnicaane. While a flood insuranca study by the Fcldclral Emeargeanay Mananlament Agency (FEMA) rclftlrenaels storm surge lelvels that arcs rclportcld to have been as high as 4.3 fciclt abavcl mcaan sea levclll (MSI; in lha ]IRL, storm swga llavels in the Atlantis Ocean kava been as high as five) feclt abova MSL. Coastal f,laading hazards are further disausscld in the Coastal Mariagornanat Hlemear.it. During f,laod clvanats, floadplains provide fhr natural overflow of wiatclrbodicls. Wilhin thcl County, floadplainis area eaxtensive and often overlook) saanic wiatearbodicis. IElue to thle ewteanl aflf ocic plains in the ciount)l and lha deamiand for deavealopment, building within flood hazarc arcaas is incavitablcl. Wctland s Within thea taundarias aflIndian River County, there ana two larges weatland arcaas. Those ara the Upper S1. Johnls R'vear Watearshed (USGS Hydrolog:ica Unit #030801(11) and the) Indian Rhear Lagaan (IRL) Walershead (UISGS Hlydrologia Unit N-J0802(12I; . Ovclrall, the Upper St. Johns River Watearshed cacanlains morcl than 88,(1(1(1 acreas afl palustri ie (frashwiatear; wetlands. Combincad, thcl St. Johns Marsh (±68,I_IO acres) and lha Fort Drum Marsh (±20,(100 acres) aamiprisea thea majarity aflthe watershad. Within the watershad, Blue Cypress, Lake acres) is tha ]largest oplean water caomponear.at. The majariq (if lthe :i 1(,30CI acre IRL waler,heac is composcad of opan water eastuarine weatlands. Of thosea 16,=1(10 acres, rnarea lhani =1,2(1(1 acires area impoundead fbr mo, quito cionlral. Approximately `100 auras of rivarine weatlands are assoaiatead wiith thea South) Prong aflthea St. Seabaslian Rlvar. A dditianal informatian ragardirig thea lacations and type, wcatlands in Iridian River County is conitainead in the Consclrvation Eleamienat aflthcl Carnprclhelnsivea Plan. Can muniit] E evelapmenit Depfirtment 11nidliain River ( aunty 112