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1 Along Wabasso Beach between DNR monuments, R19 to R45, shoreline erosion occurred within the northern half of the area at an average rate of 1.6 feet per year. The southern half of the area accreted at a rate of 0.4 feet per year. Substantial shoreline accretion occurred within the Indian River Shores (R45 - R71) segment between 1972 and 1986. An estimated 1.1 feet per year of shoreline accretion occurred within this area. Maximum accretion occurred at monument R54 amounting to 4.7 feet per year. . r The DNR historic shoreline summary at Vero Beach is illustrated in Figure All. Typical historic beach profile comparisons are illustrated in Figures Al2 and A13. Within the City of Vero Beach, the shoreline north of Riomar Point (R71 -R87) fluctuated according to weather conditions and, in average, eroded at a rate of 0.1 feet per year. However, the shoreline south of Riomar Point experienced a substantial accretion at 6.0 feet per year. Due•to the geographic geometry, the area south of Riomar Point acts as a sediment sink and prevents the sediments from moving towards north. The northern portion of the Vero Shores coastline (R94 -R101) continues the accretional trend associated with the Riomar Point (Figure A14). Accretional Shoreline changes fluctuated within the southern Vero Shores segment and the magnitude decreased towards the south. A5.3 VotumeMc Changes Volumetric changes above and below the 0 feet NGVD contour in Indian River County are evaluated using 1972 and 1986 hydrographic survey data (Table A7). The area evaluated for volumetric changes below the 0 feet NGVD contour extends approximately 3,000 feet offshore, or approximately the 30 foot water depth. This area enables a distinction to be made of the sand movement within the upland and offshore regions. Characteristics of volumetric changes are also evaluated for the above mentioned five regions. COASTAL TECH COLM-nfVVkOO Nft-O,.-9MM1AWAWRu,,,,W A25