| 405 / | HD | HYDRAULIC AND EARTH ENGINEERING |
| 52 | DF | FLUID CONTROL, TREATMENT, OR CONTAINMENT {7} |
| 60 | DF | .~ Floatable matter containment {4} |
| 63 | ![]() | .~.~ Floating barrier {5} |
| 64 | DF | .~.~.~> Submergible |
| 65 | DF | .~.~.~> With means to seal space between barrier and fixed structure |
| 66 | DF | .~.~.~> With barrier storage or deployment feature {2} |
| 70 | DF | .~.~.~> Having joint detail {1} |
| 72 | DF | .~.~.~> With reinforcing feature |