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I . I>, I The Sebastian Inlet Tax District has adopted a "Comprehensive Inlet Management Plan" (Coastal Tech, 1988) to dredge the sand trap for sand transfer every two to three years. The plan is to transfer an average of 57,000 cubic yards of sand i annually to the beaches south of the Inlet (Table A5). A5.0 SHORELINE AND VOLUMETRIC CHANGES ASA General Shoreline and volumetric changes are evaluated for Indian River County including the City of Vero Beach to understand the conditions of historic beach accretion and erosion and sand movement within the littoral system. The Indian River County coastline is divided into five areas for evaluation, from north to south including Ambersand, Wabasso Beach, Indian River Shores, Vero Beach, and Vero Shores. Characteristics of beach erosion and accretion within each area are evaluated based on the 1972 and 1986 hydrographic surveys. The effects of Sebastian Inlet, offshore shoal, and geographic orientation of the shoreline at Riomar Point on sand movement are presented. A5.2 Shoreline Changes r Shoreline changes within the County between 1972 and 1986 are summarized in Table A6. The northernmost segment of the County, from Sebastian Inlet State Recreational area to Ambersand Beach (R1 -R19), experienced erosion at a rate of 1.1 feet per year. The most severe erosion occurred within 3,000 feet south of Sebastian Inlet with an average rate of 4.9 feet per year. This is because the Inlet deprives part of the southerly littoral drift from reaching the downdrift beach. The magnitude of beach erosion decreases towards the south. The accretion found between DNR monuments R8 and R11 is believed due to the 1978 and 1986 feeder beach projects, in which 187,600 and 110,000 cubic yards of sand were placed on south park beach, respectively. COASTALTECH COM&'F WK.CW-INWAE,„A",,"04 A19