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r <br />SEP <br />The St. Johns River Water Management <br />responsibility of local sponsorship <br />River Basin Project by signing an <br />eration with the Corps of Engineers o <br />BOOK 61 FA}E 919 <br />District (SJRWMD) took the <br />of the Upper St. Johns <br />agreement of local coop - <br />n December 31, 1976. <br />At the present time, all work on the authorized project is <br />suspended. Maintenance of existing levees and structures is <br />carried out in accordance with local cooperation agreements. <br />This report provides new directions to the project by recom- <br />mending what Federal actions should be taken with regard to the <br />authorized plan -- both constructed and unconstructed portions <br />and new features that would be constructed to supplement <br />existing facilities or replace facilities no longer necessary <br />under the final plan. <br />The Federal objective in the preparation of the General Design <br />Memorandum is to develop a plan for the Upper St. Johns River <br />Basin which would contribute to national economic development <br />consistent with protecting the nation's environment. <br />More specifically, the following items were evaluated during <br />preparation of this report. <br />a. Flood Control. The basin was modeled to determine <br />cost effective means for achieving flood damage <br />reduction. <br />b. Irrigation Demands. The irrigation needs of the <br />upper basin were evaluated. These needs were those <br />that could be met by --withdrawals of water from Blue <br />Cypress Lake and the water management areas. <br />C. Significant Environmental Impacts. Areas where <br />significant environmental impacts could occur have <br />been identified as the Jane Green Creek Upland <br />Detention Area, Indian River (due to releases through <br />the C-54 Canal), the Fort Drum Marsh Conservation <br />Area, and the Blue Cypress Marsh Conservation Area. <br />The plan for Indian River County includes the development of <br />two (2) marsh conservation areas, two (2) stormwater management - <br />areas, conveyance capacity improvements for a number of exist- <br />ing canals and levee construction. <br />1) Ft. Drum Marsh Conservation Area (FDMCA) <br />FDMCA will be created south of SR 60 to provide for <br />stormwater detention and water conservation on <br />existing marsh, diked marsh and agricultural areas <br />which will cover 18,040 acres. <br />A total of approximately 19.2 miles of new levees <br />with a crest elevation of 34.0 ft NGVD will be <br />constructed to create this storage area and also to <br />provide flood protection to the adjoining agricul- <br />tural areas. <br />2) Blue Cypress Marsh Conservation Area (BCMCA) <br />BCMCA is a primary water storage area in the Upper <br />St. Johns River Basin. It will receive discharge <br />from FDMCA and runoff from the tributaries west of <br />Blue Cypress Lake. This marsh conservation area is <br />bounded to the north by the Fellsmere Grade and south <br />by SR 60. <br />3) Blue Cypress Stormwater Management Area (BCSMA) <br />This 9680 acre stormwater management area will be <br />located between SR 60 and Fellsmere Water Control <br />District covering land areas east and west of SR 512 <br />for the management of stormwaters from St. Johns <br />Water Control District (SJWCD) reservoir and other <br />agricultural developments. <br />36 <br />