was determined to have extended approximately 7,000 ft south of the south jetty. The fill 

 was placed on the beach from the Harbor's south jetty and extended south approximately 

 10,500 ft. The fill compensated for preexisting erosion over the distance of 7,000 ft, as well 

 as nourished previously accreting areas that are located beyond 7,000 ft south of Canaveral 

 Harbor. 



2. The beach in the 7,000-ft erosion-impact zone covered by the fill has experienced erosion 

 since 1974/75. The volume of sand placed on the beaches south of the Harbor in 1974/75, 

 and subsequent smaller fills and nearshore placements in the 1990s, has been effective at 

 maintaining the shoreline seaward of its September 1972 pre-fill position. Nearly all impacts 

 (beach erosion and shoreline recession) caused by the Harbor relative to pre-fill conditions, 

 have been mitigated by placement of sand just south of the entrance channel. 



3. Erosion that developed since the US ACE beach fill in 1974/75 extends approximately 

 17,000 ft south of Canaveral Harbor, an increase of about 10,000 ft relative to the southern 

 terminus of the erosion-impact zone that had occurred along the pre-fill (natural) beach. The 

 increased distance of erosion is attributed to adjustments in the beach fill resulting from 

 geometric differences (equilibration of beach slope and spreading loss associated with beach 

 fills) and, possibly, grain-size differences between the natural beach and the engineered 

 beach. 



4. Sand-bypassing rates were determined through analysis of long-term sediment transport 

 processes by comparing pre- and post-Harbor bathymetric surveys. Sand bypassing can 

 mitigate or eliminate downdrift beach erosion caused by Canaveral Harbor. Net longshore 

 transport rates were calculated for the vicinity of the Harbor. The volume of sand deposited 

 along the beach north of the Harbor prior to its construction was subtracted from the volume 

 of sand that accumulated in the entrance channel and deposited north of the Harbor after its 

 construction, yielding an estimated sand-bypassing rate. 



Based on analysis of bathymetric data spanning 65 years, the net sand transport rate near the 

 north jetty was calculated as 308,000 cubic yards per year (cy/year). The associated sand- 

 bypassing rate was calculated as 155,000 cy/year (taking into account the natural sand- 

 deposition rate prior to Harbor construction). Between 1972 and 1997, the US ACE placed 

 about 4.0 million cy (Mcy) of sand on the beaches within 17,000 ft south of Canaveral 

 Harbor, and the shoreline to at least 42,000 ft south of the Harbor experienced net advance. 

 Therefore, the calculated volume of sand bypassing (155,000 cy/year x 25 years = 3.9 Mcy) 

 nearly balances the sediment added to the beach by the USACE between 1972 and 1997. 



Summary 



