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Comprehensive Plan 8lormwaplerMat agemend 8uib-Elemenit <br />In ter -r U gfi A Yea <br />Betwlecin thea Atlant:ici Ccaaslal Sand Ridges arid the Teen Millei Ridge ]lies a flat shallow deipress:icn <br />iieferncid to as thea Initar-ridge basin. In its originiall stallei, thal basin hlistmically drained northward to <br />the Sault Fror.ig of tho St. Sebastian Riluar. Taday, hlowovar, thlci southern cind of tha Intor-riidge basin <br />is 1lrauerseac by a r.ietwork of drainago caaraals. Cor.iseaquonlly, only a smalll portian of this basin in the <br />niorthl part of thea County still Grains to the St. Sebastian River. <br />St. JloHns Marsh/Uppfir St. Jlaahns Rivcir B asin <br />West oflthea "Ileani Milei Rhic €lea is tha broad flat area of the St. Jlcands Marsh). Whiles thea vwestorn edges of <br />the marshl is realat:ivoly flat and about 25 feet abavci sea leaved, thea ealovation riseas to approximalely 40 <br />feed abcavci soa levoll near tha In ian Rivor-Oscaeiola County lir.ia. That formation is knlowr as tho <br />Tallb all "Heinaacci. Batweaen the Talbot Ternaae anid Intorstal ei 93, the arcia i s manishy and poorly diialineid <br />withl some drainagle improvemieints slaving boars mado to barief:it agr:icaultural inteaiiests, incaluding caitrus <br />graves avid caatt:lei rancaheas. <br />A langea portions of Iwasl arni Ik ian River County is caaveniad by the St. Jlohnl's Marsh, making thea mar4l <br />a rnE jori parl oflthle natural dra:inaga system. Although thea marsh is thea hleadwaators ofltho St. Jlohhs <br />River, the rimar's ahlannieas are not woll dafmcad withlin thle marshl. Part oflthci St. Johns River systorn <br />is Bluca Cypress Lakes, whiahl is thci laarge:at bady of flrashwiatcar :in thea caauntyl. 11hulcauglhout thea marsh, <br />niaturiall drialinaga fllow is to thle northl. Consequently, much of thlis aaieia is awned and managlcic by thea <br />S IAW MD for f food aontrol arid irn:igation. <br />Rleiccintly, the S114WMD aomphillad a m a jor restoiiatican pro feat fkar tha Ulppor St. Jlohnls River Basin. <br />That pro fecal invalvad caonstrucating a number oflwatcir caonlrol strucatures fbr the purposea aflrollurning <br />agriculltural wands to waetllands. A beaneif t afI Ihei piiojecl is that it rciducaas tHa necid Mir ficishwatar <br />discaslariga into the IRL via 11ha CI -_I4 canal. By reducing thea am ounl caflflrcishwater f.lavw from thea C-14 <br />canal) to thea IRL, the reastaration projoat has improvad water quality in thci IRL. Addidionial <br />information about thea Ulpper St. Johns River Basins is cacanlained in 11ha Coniscirvation Blemeant. <br />Cli mall f <br />Tluloughout thle yeah :in Indian River County, rainffll is uncivcinly c isllributed. H iglcarically, the most <br />rainfall] has boar.i recacmdead in thle miontsl of Septamberi, followed in order by July, August and Jlunci. <br />Nearly _10 pcarciant caflthle annual rainfalll occurs in thlesa fbus manths. For thci period from 15111 to <br />2(1(10, rainifala averaged 51.93 inches per year (rnaa:aurcic at tho Mero BeadMunicipal Airport; . <br />During than peiriod, thea higheasl and loweisll rainfalls rocaardcic werci ((.7 inches in 1991 and 32.7 <br />inches :in 15161 (National Waathor Sarvico' . <br />CommuOy Develaplmerill Dleprlmerd Ikihiini Piver Caumity 1(I <br />