Maintaining the spoil banks along the completed canal became a critical factor in reducing the amount of saltwater that bled from the channel into the adjacent wetlands. In 1995 the Louisiana Department of Natural Resources closed four breaches with rock in the west bank of the Houma Nav. Ten years later the agency rocked 7,572 linear feet of foreshore dike. Engineers tied the dike to the west bank of the channel just to the north of Falgout Canal to the south and the southern-most end of the earlier dike to the north.[i]
As we have see with the closing of MRGO at Bayou la Loutre, the Louisiana Department of Natural Resources and its partners use rock to shore up bank lines and close canals. It works well until is sinks in the soft Louisiana muck. Then, it has to be shored up.
[i] Louisiana Department of Natural Resources, Office of Coastal Restoration and Management, Coastal Engineering Division, “Falgout Canal Wetlands Project,(TE-02): Bank Stabilization along the HNC Levee,” Project Completion Report, January 2006.