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The County coastline experienced a total net loss (including the beach & <br />submerged areas) of approximately 1,268,897 cubic yards. Also occurring during <br />the period of analysis was several major inlet bypassing efforts and dune <br />maintenance operations. Between 1986 and 1997, it is reported that the <br />Sebastian Inlet Taxing District placed 680,500 cubic yards south of the Inlet and <br />the City of Vero Beach has placed, on average, 10,000 cubic yards per year on <br />City park property. Considering both apparent losses from the profile data and <br />the additional sand volume placed into the system, the total or adjusted losses <br />become 2,059,397 cubic yards. Therefore, the equivalent annual erosion rate <br />becomes 187,218 cubic yards per year. Further analysis indicates approximately <br />59,000 and 128,000 cubic yards per year were eroded from the beach and <br />submerged regions, respectively. The magnitude of volumetric changes within <br />the submerged area is twice that of the beach area. The possibility exists that <br />the hardbottom may be a factor influencing this increased sand loss. Further <br />evaluation is necessary to determine the effects of the hardbottom. <br />Table No.3: Volumetric Changes (Jun86-May97). <br />Note: 1. Negative (-) number irKbeates erosion. <br />Sector 1 <br />Overall volumetric erosion has occurred in this Sector. While the beaches <br />experienced erosion the submerged region accreted slightly. Recent inlet <br />bypassing efforts have relieved some of the erosion in this Sector, however, the <br />historic effects of the Inlet's presence have left the downdrift beaches scarred. <br />MAY 59 1998 <br />Volumetric Change <br />/ft/ <br />Sector No. <br />Monument <br />BeachSubmerged <br />Above ).Oft <br />NGVD <br />Below 0. Oft <br />NGVD <br />Total <br />Rate <br />1 - Sebastian Inlet <br />R1 -R11 <br />-2.0 <br />0.2 <br />-1.8 <br />2 - Ambersand <br />R11 -R19 <br />-2.4 <br />-2.0-4.4 <br />3 - Wabasso Beach <br />R19 -R45 <br />-1.3 <br />-1.9 <br />-3.2 <br />4 - Indian River Shores <br />R45 -R71 <br />4a <br />R45- R53 <br />-1.4 <br />-1.6 <br />-3.0 <br />4b <br />R53 -R71 <br />2.2 <br />-1.0 <br />1.2 <br />5 - Vero Beach I <br />R71 -R86 <br />58 <br />R71 -R77 <br />0.3 <br />-1.3 <br />-1.0 <br />5b <br />R77 -R86 <br />2.0 <br />-1.0 <br />-3.0 <br />6 - Vero Beach II <br />R86 -R94 <br />1.7 <br />1.8 <br />3.5 <br />7 - South County <br />R94 -R113 <br />7a <br />R94 -R100 <br />1.7 <br />2.1 <br />3.8 <br />7b <br />R100 -R107 <br />-2.3 <br />-3.2 <br />-5.5 <br />7c <br />R107 -R113 <br />1.9 <br />-1.0 <br />0.9 <br />8 - Round Island <br />R113 -R119 <br />0.8 I <br />-1.0 <br />-0.2 <br />Note: 1. Negative (-) number irKbeates erosion. <br />Sector 1 <br />Overall volumetric erosion has occurred in this Sector. While the beaches <br />experienced erosion the submerged region accreted slightly. Recent inlet <br />bypassing efforts have relieved some of the erosion in this Sector, however, the <br />historic effects of the Inlet's presence have left the downdrift beaches scarred. <br />MAY 59 1998 <br />