1. L - Walls BEFORE AFTER DESCRIPTION:
11/16/2018
L - Walls
Face
Base
Angled Splash
Plate
Key
BEFORE
DESCRIPTION:
Patented Waterfront sea walls or bulkheads
Applications:
Bank stabilization
Retaining Wall
4 tons for a section and 4.7 tons for a corner
8’ long X 5’9” wide X 7’4” high
5,000 psi - DOT bridge grade concrete
Installation Base: 2007
Number of sights36
Cumulative feet 7,700
First Installed 1994
AFTER
Sources: (1)

2. T - Walls BEFORE AFTER 11/16/2018 DESCRIPTION:
Groins (placed perpendicular to bulkheads)
Applications:
To trap and hold sand
Low Bulkhead
Retaining wall
1 Ton each
10’ long X 2’6” wide X 2’9” high
Type A unit has angled cut-out to fit up against bulkhead
Type B unit is a plain rectangle
Type C unit has tapered seaward end (prevent eddies)
5,000 psi - DOT Bridge Grade Concrete
Installation Base: 2007
Number of Sights28
Cumulative Feet 3500
First installed in 1994
AFTER
Sources: (1)

3. Sealogs DESCRIPTION: 11/16/2018 Mat of concrete logs wired together
Applications:
To form submerged end of boat ramps
To provide scour protection from waves
160 pounds each
8’ long X 4’ wide mat of 8 logs
5,000 psi - DOT Bridge Grade Concrete
Installation Base: 2007
Number of Sights6
Cumulative Feet  84 4’x8’ mats
First installed in 1995
Sources: (1)

4. Hex Box segmented breakwater unit
11/16/2018
Aug 9, 2007
Aug 14, 2007
Aug 22, 2007
May 23, 2008

5. Hex Box Characteristics
11/16/2018
Hex Box Characteristics
Dimensions: 8’ long, 3’ to 7’ wide, height 4’ to 6’
Weight varies with height, from 3.6 to 4.5 tons.
11% porosity of wall face from 12” Dia. holes gives wave reflection coefficient of .3 with a 25 foot wave length. This is less than a 1:2 slope rock breakwater and does not consider the extra effects of the angled face on reducing reflection effects.
No steel in concrete, Synthetic structural fibers used for reinforcement of the 5000 PSI concrete.
Tongue and groove slots in ends lock each box to its neighbor as well as two concrete pins that are driven down through the floor of the box into the riverbed to hold their position.

6. Hex Breakwater Layout
11/16/2018
The inside of a hex box fills with sand and allows recruitment of plants and animals in a sunlight, calmer environment. Hex boxes have a higher replacement habitat value than rock, while allowing animals to pass through the large holes in the box’s walls.

7. 11/16/2018
The Seament Sill box is a 8’ long open topped box, height from 2’6” to 4’ and width of 3’ to 4’6”. It weighs from 1 to 2 tons empty and can be floated into position without damaging existing marsh or SAV. The open top box allows SAV and grass to grow inside the box and the large holes allow animals to easily move between the water and marsh. The wave reflection of the box, with the holes in the face should be equal or lower than a comparable stone sill of 2 to 1 slope.