Edisto Beach Renourishment and Groin Lengthening Project Tim Kana Coastal Science & Engineering
Hurricane Matthew 8 Oct 2016 Cat 1 Storm @ Edisto Beach Worst Surge Event Since DAVID in 1979 Tides ~ 5 ft above normal
Hurricane Matthew 8 Oct 2016 9 October 2017 Steven Traynum
Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew Groin 16 Nancy St 9 October 2017 Steven Traynum
Groins 28-29 Point St Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew Standing Flood Waters at The Point 9 October 2017 Steven Traynum
Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew 9 October 2017 Steven Traynum
Baynard St Fairfield Cabana Hurricane Matthew 9 October 2017 Steven Traynum Jenkins St
Hurricane Matthew 9 October 2017 Steven Traynum
Hurricane Matthew 11 October 2017 Luke Fleniken
Hurricane Matthew Thank you National Guard! 11 October 2017 Luke Fleniken
CSE founded in 1984 CSE Most SC nourishment and groin experience of any private group Completed over 40 nourishment projects since the 1980s. Major projects at Myrtle Beach, Seabrook, Hunting, Edisto, Kiawah, Folly, Bogue Banks (NC), Nags Head (NC).
The Setting Edisto Beach Setting 2008 2012 Edingsville-Botany Bay
September 2012 Condition Why is Edisto Beach so shelly?
Edisto Beach 5.8 miles from Jeremy Inlet to Big Bay Creek First Development - ~1920 ~3.4 miles of upland along the Atlantic ~190 oceanfront homes in project area ~2,180 residential units Beach Nourishments: 1954, 1995, 2006 Groins 34 groins built between 1948 and 1975 Groins rehabilitated in 1995 Federal Study Initiated 2003 Ongoing CSE Studies 2012 Built on USACE
1954 Edisto Beach Nourishments 1995 First SC Nourishment Project! 1955-2010 Adjusted Cost: $15,500,000 ~$15.50 per foot of shoreline per year (Kana 2012) 2006
Beach Volume Changes Since 2006 Project Areas Lost ~450,000 cy (~51% of Fill) Between 2006 & 2015
Volume Changes Since 2006
2015 Condition Exposed Seawall Cell 1 Cell 3 Cell 2 Cell 11
Groin 16-2015 These Building Setbacks Became the Target Minimum Condition for CSE s 2017 Plan
2012 Groin Extension Study
2012 Groin Extension Study
2012 Groin Extension Study Compared groin lengths relative to houses Extensions based on condition of groin 16 Extensions would protect stable dunes in chronically eroded areas
2017 Project Larger than USACE initial nourishment plan Expanded by State & FEMA funds Sought most beneficial combination of nourishment/groin lengthening Timely Implementation possible after Hurricane Matthew Included lengthening for 26 groins The Town was able to accomplish full plan Nourishment volume greatly exceeds trapping capacity of the groins
Project Funding Town of Edisto Beach State of SC (Nourishment Fund) SCPRT (Park pro rata share) Colleton County Sales Tax Fund FEMA (post-joaquin Grant) FEMA (post-matthew Grant) 3,000,000 6,800,000 3,270,000 4,000,000 1,100,000 1,400,000 Total 19,570,000 Covers construction, engineering, permitting, sand fencing, environmental protection & contingency
Borrow Area 2006 Area Borrow Area was evaluated as part of the USACE planning Additional borings were obtained to determine changes since 2008 Most of the 2006 borrow area filled in with sandy material
2017 Beach Nourishment Project Dredge Savannah Marinex Construction Inc
Project Limits Design - 1,006,000 Cubic Yards Contractor: Marinex Construction Inc. Charleston SC
2017 Construction First Day of Pumping 25 January Groin Extensions 25 January 2017 Tim Kana 26 January 2017 Haiqing Kaczkowski
2017 Construction Finn s Restaurant after Matthew Cleanup Before Nourishment 6 February 6 Feb January 2017 Steven Traynum
2017 Construction Included Storm Berm 6 February 2017 Steven Traynum
2017 Construction Groin 28 Extension Placing Grout 27 February 2017 Steven Traynum
2017 Construction Groin 8 Extension Driving Sheetpiles 27 February 2017 Steven Traynum
2017 Construction Groin 8 Extension Placing Mattresses To Stabilize the Armorstone 27 February 2017 Steven Traynum
2017 Construction Groin 8 Extension Placing Armorstone for Scour Portection 3 March 2017 Andy Hammill
2017 Construction Groin 8 Extension Preparing Cap 15 March 2017 Steven Traynum
2017 Construction Groin 8 Pouring Cap 15 March 2017 Steven Traynum
2017 Construction Second Landing Zone Cell 19 near Fairfield Cabana 9 March 2017 Steven Traynum
2017 Construction 20 April 2017 Nourishment Complete
2017 Construction Groin 1 Extension @ State Park 20 April 2017 Steven Traynum
20 April 2017 20 April 2017 2017 Construction
20 April 2017 2017 Construction
20 April 20 April 2017 2017 2017 Construction
20 April 20 2017 April 2017 2017 Construction
2017 Construction 20 April 2017 20 April 2017
20 April 20 April 2017 2017 2017 Construction
20 April 20 April 2017 2017 2017 Construction
20 April 2017 20 April 2017 2017 Construction
Post Construction - Expectations 2006 Project
Post Construction - Expectations The Point
Expected Outcome 17 Feb 2007 ~8 months after nourishment Photo by Tim Kana Project Director
Edisto Beach Project - 2017 Town of Edisto Beach Acknowledgements Jane Darby, Mayor Susan Hornsby, Councilwoman Jerome Kizer, Councilman Crawford Moore, Councilman Patti Smyer, Councilman Iris Hill, Town Manager Thank you! Photo by Steven B. Traynum Project Manager www.coastalscience.com