Geotube ® Shoreline Protection Prevents Damage To NASA Site To ready the beach for tube placement, a D6 hightrack dozer was used. Once prepped, scour aprons, secured by anchor tubes filled with sand slurry, were positioned underneath each tube section to protect their foundation from rough wave and ocean current action. A total of 23 Geotube ® units were used—each 200-feet long, 34-feet in circumference, and filled with slurry mix

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