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f <br />4, <br />The greatest offshore erosion occurred within two regions, Wabasso Beach and <br />Vero Beach, as illustrated in Figure A15. The magnitude of volumetric changes <br />within the upland area is much less than that in the area below the 0 feet NGVD <br />contour. Active sand movement within the offshore area is believed due to the <br />effects of the offshore shoal, nearshore hardbottom and Riomar Point. The detailed <br />volumetric changes within each region are discussed as follows. <br />The northernmost region including Sebastian Inlet State Recreational area and <br />Ambersand Beach (R1 -R19) experienced erosion at a rate of 1.1 cubic yards per <br />foot per year. Approximately 75 percent of the erosion occurred below the 0 foot <br />NGVD contour. The remaining 25 percent occurred within the upland area. <br />Substantial volumetric erosion occurred within Wabasso Beach (R19 -R45) at a rate <br />of 1.1.4 cubic yards per foot per year. Approximately 10.6 cubic yardstfeet/year, or <br />93 percent, were eroded from the offshore area. Erosion is believed due to end <br />effects of the offshore shoal. <br />Indian River Shores, located between Wabasso Beach and Vero Beach incurred <br />substantial erosion. The average rate of erosion within -this area is approximately <br />3.3 cubic yards per foot per year, of which 94 percent occurred below .the 0 foot <br />NGVD contour. <br />The Vero Beach segment, where the P.E.P. Reef is proposed, also experienced a <br />substantial erosion in the offshore area. An estimated 9.8 cubic yards per foot per <br />year erosion occurred within this region. Approximately 9.0 cubic yards per foot per <br />year of erosion, or 92 percent, occurred within the offshore area. Erosion in this <br />area is mainly due to the geographic alteration at Riomar Point. It is noted that an <br />accretional trend within the upland area is found south of Riomar Point, <br />COASTALTECH , COAM -E NM - CN% -INGM04A.40PLANW4 <br />A31 <br />