other and were placed in a line across the seaward end of the groin cell. A new innovation
was to place a filter cloth with a concrete-filled tube on the landward end as a base under
the structures to prevent scour and settlement (experienced with the 1994 placement in
cells 2 and 3). A line of 72 units was constructed completely across cell 5 using a barge-
mounted crane and rocks were placed to connect the Beachsaver Reef with the adjacent
groins, making a closed compartment.
In cell 6, a unique innovative "Double-T" sill was constructed with the same barge-
mounted crane. This sill was composed of a reinforced prefabricated concrete parking
garage deck that was turned upside down so that the two legs of the structure faced toward
the surface. One end of the unit had an extension of the legs that allowed placement of the
units in a line to interlock. Dimensions of this Double-T sill were 9.1 m (30 ft) long, 3.6 m
(12 ft) wide and 0.85 m (2.8 ft) high and weighted around 169,032.41 (19 tons). No filter
cloth was used in this placement. A single line of 22 units was placed at -2.7 m (-9 ft)
North American Vertical Datum (NAVD) across the seaward end of the groin compart-
ment to create a closed sill structure.
Construction complete, monitoring program ongoing.
Points of Contact
Donald K. Stauble, CEERD-HC-SE, 3909 Halls Ferry Road, Vicksburg, MS 39180-6199;
phone, (601) 634-2056; e-mail,
Randall A. Wise, CENAP-EC-H, Wanamaker Building, 100 Penn Square East,
Philadelphia, PA 19107-3390; phone, (215) 656-6890; e-mail,
J.B. Smith, CENAP-PL-PC, Wanamaker Building 100 Penn Square East, Philadelphia, PA
19107-3390; phone, (215) 656-6579; e-mail,
Water Resources and Development Act of 1996 (Public Law 104-303, 110 Stat. 3658)
dated October 12, 1996.