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