Brevard County Summary & Conclusions

• Overall, [from post-construction to 1-year post-construction], roughly 208,400 cy (above -16 feet) were lost from the 14-mile long monitored shoreline.  At least 30,000 cy moved northward past the south jetty and an additional 19,400 cy were assumed lost offshore.  In the balance, roughly 159,000 cy were transported southward past R-77.
• From the rudimentary sediment budget, based solely on the one-year volume changes, two inflection points separating net northerly and southerly transport were located at R-08.3 and R-38.2.
• The overall project performance of both projects as measured in June 2002 (about 15 to 18 months after project construction) is generally satisfactory, and meets or exceeds the design expectations.

• May 2006 Conditions Relative to Post-Construction (2005) Conditions:
  • North Reach.  Survey data suggest that the 2004 hurricanes transported approximately 1.15 Mcy of sediment into water depths greater than -16 ft.  The 2005-06 volumetric gains measured above -16 ft, NGVD suggest that a large portion of this material may have been transported back above the historic depth of closure, -16 ft, NGVD.  Verification of the landward transport sediment from deep-water is not presently possible with the available survey data.
  • Patrick Air Force Base.  Along PAFB (R53-R75.4), between June 2005 and May 2006, there was a net volume loss of -54,600 cy above Mean High Water (MHW), but a net volume gain of +459,900 cy measured above -16 ft, NGVD.  The 2004 hurricanes appear to have deposited about 864,400 cubic yards of sand across the offshore profile, below the -16 ft (NGVD) depth contour, along almost all of PAFB.
• May 2006 Conditions Relative to Initial Post-Construction (2001) Conditions:
  • North Reach.  Along the entire North Reach project area (R1-R53), there was a net volume loss of -0.33 Mcy above Mean High Water (MHW), and a net volume loss of -1.95 Mcy above -16 ft, NGVD.
    On overall average (R1-R53), the North Reach berm and mean high water shoreline (MHWL) are about 35.1 and 45.4 feet landward of their respective 2001 post-initial-construction locations.
  • Patrick AFB.  Along PAFB (R53-R75.4), between June 2001 and May 2006, there was a net volume gain of 54,800 cy above Mean High Water (MHW), and a negligible net volume loss of -600 cy measured above -16 ft, NGVD.  During this period, about 321,500 cy of renourishment sand was placed, in Spring 2005.
    On overall average, the PAFB shoreline is approximately at or slightly landward of the initial post-construction shoreline of 2001: the MHW shoreline is about 1.1 feet west, one-year following the 2005 renourishment.
  • Profile Changes in Deep Water.  The 12/2004 beach surveys consistently indicated a significant deposition of sand along the outer beach profile, from -16 to -30 feet, NGVD, as a result of the 2004 hurricanes.  The May 2006 survey data show significant volumetric gains above -16 ft and suggest that some of this material has been transported back onto the shallower, more active portions of the project area; however, the offshore data measured seaward of -16 ft for the most recent survey is of uncertain accuracy in quantifying or verifying deep-water sediment transport.