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03/09/2007 13:03 3063294499 SJRMC WATER <br />Rc aJRC PAGE 03/04 <br />f• Fort Drum Marsh Conservation Area M A1, <br />specified in Interim plan 2. Operations.will be as <br />9• S . Johns�iYer_i1nOd Plain. Part of L -74H and culvert structure <br />S-255 will be compete prior to .this interim plan, S-Zs5 has flapgates which <br />permit water to flow freely from east side of L-701 to the floodplain of the <br />St. Johns River, <br />7-09. Interim plan S, During this interim plan L»74H Remainder, L-82, and <br />S-257 will be constructed. $4258 will' be functional. The FDMCA, ROMCA, <br />BCWMA, and the SJWMA will be fully functional during this interim plan. This <br />interim plan will -,be used until the cainpietimn of Contracts 53, SC, and So <br />which will be the completion Of 4.411 project features. <br />a• Jane ii Plan 1. een Detention Are•, ! Operations will <br />in Interim continue as specified <br />b. Taylor Cr e Reservoir. Operations will continue as specified in <br />Interim Plan .1, <br />C6 St. 3ohns Water Mana4emant 'pre, (c_MAJ6 Operations will continue <br />as -specified in Interim plan 3. <br />d. Biue..Cwre s Marsh Conservation Area (50CA). Operations wird be <br />as specified under Idter,tq pian 4, <br />e. <br />will be nfner.GvnresS.,M sr•Manaaemant Ar" (MMA1, Mater in the BcWMA l <br />seasonally regueied hetween eleuations. and 25.5 ft., WgtlO, <br />The regul3t.10n•Schedule. is ftntnd'Orr FPgure used 7»4, When the" s. age is i Zone A, <br />.S -96D wit} be ud to make maximum releases to the Sum, The. spillway gates <br />shall be opened and closed gradually to provide an even transition to the new <br />flow regime and to minimize the hydradlic affects downstream. The correct <br />gate setting for S -96D can be determined from pgthe,Discharge Rating Curves <br />found in additional 600dcfsA.ndSJRWM culvert rSPP conditiousSfrom�iE�eoi1GWMA e Of oto theiSJWMk. When <br />eD <br />mahyo be Ica <br />S 3omayBal a ea opened foreD iennmennmentad' Water supplyter Purposes <br />releases. S-251 will normally retain°open. S-251 will he used to control <br />—� <br />East- BCWMA to prevent ovardrainage of ;the east.por 36 ,— <br />private levees bordering tfie East BMA, and to prevent reverse (bows at high <br />stages from the West 9CWMA to the East RUMA, If the stage in the West BCWMA <br />is greater than 25.0 ft. and is also greater than the stage in the East BCWMA, <br />then S-251 should be closed. 5-251 may also be closed for environmental <br />purposes. S-254', a weir structure, lotaied in the western portion of L-77 <br />will prevent the build up of head an fha levee. hater will flow freely over <br />the weir when the water surface reeches elevation 26l6ater ft., flowNGVD into the. <br />BCMCA to assure post -project flood stages (above the weir elevation) in the <br />flowway and south of lite turnpike that are Tess than or equal to pre -project <br />conditions, Stage vs, Storage data fo`r the SCWMA is found on Table 7-6 <br />located at the end of the chapter, <br />474 <br />