Boca Raton South Summary & Conclusions

• From December 1996 to June 2000, the beach experienced a net loss of approximately 89,600 cubic yards of sand landward of the -6 foot (NGVD) contour.  A loss of nearly 143,650 cubic yards was documented between BCL-4 and BCL-10, while the area between BCL-11 and BCL-12 gained approximately 22,800 cubic yards of sand.  The beach to the south of the fill limits (BCL-1 to BCL-3) gained approximately 31,200 cubic yards since post-project conditions.  During this period, the city's dredge transferred approximately 262,500 cubic yards of sand to the beaches south of the inlet which may account for the volumetric gains observed between BCL-11 and BCL-12.

• Due to the effect of the inlet and inlet jetties, the beach south of the inlet is subject to erosion with the highest rate of erosion usually occurring within 2,000 feet of the inlet.  Through continual interior inlet dredging and periodic ebb tidal shoal dredging, the beach is maintained.  Sand placed on the beach is transported through littoral processes to the south, into Broward County.
• Following the March/April 2002 project, the shoreline was extended an average of 117 feet seaward with the construction of the beach nourishment project.  The May 2003 (one-year post- construction) survey documented that 91% of the placed volume remained in the project area landward of the -18 foot (NGVD) depth contour.

• The April 2004 (two-year post-construction) survey documented that 77% of the beach nourishment volume remained within the project area landward of the -6 foot (NGVD) depth contour.
• During the May 2004 (two-year post-construction) survey, the range of water depths measured in the Inlet channel were between -4 (along the side of the Inlet) to -26 feet (NGVD).
• In addition to the periodic dredging of the ebb tidal shoal, the volume of sand transferred by the City dredge from within the Inlet during the 2002-2003 fiscal year was approximately 27,510 cubic yards. The dredging was performed in the interior channel of Boca Raton Inlet and along the western edge of the ebb tidal shoal.  Due to the effects of the 2004 Central Boca Raton Beach Nourishment Project, it is anticipated that the volume of sand transferred in 2004 and 2005 will increase.