Who Wants to be an Engineer?
Dredging - Keeping Our Underwater Highways Open

Directions: Indicate the best answer.

1. A ___________ is a machine that scoops or suctions sediments from under the water.

1. Dredge
2. Barge
3. Tanker
4. Submarine

2. Underwater excavation of sediment is called _____________.

1. Exploring
2. Tunneling
3. Dredging
4. Diving

3. Which of the following uses satellite information to aid ship captains with navigation?

1. Channel markers
2. Celestial charts
3. Navigation charts
4. Global positioning system (GPS)

4. Which of the following is not a type of dredge?

1. Mechanical dredge
2. Hydraulic dredge
3. Chemical dredge
4. Airlift dredge

5. Which of the following types of dredges remove material by scooping it from the channel bottom and then placing it onto a waiting barge or into a disposal area?

1. Hydraulic dredge
2. Pipeline dredge
3. Mechanical dredge
4. Airlift dredge

6. Which of the following are examples of mechanical dredges?

1. Hopper and pipeline
2. Airlift
3. Waterlift
4. Dipper and clamshell

7. Which of the following are examples of hydraulic dredges?

1. Airlift
2. Waterlift
3. Hopper and pipeline
4. Dipper and clamshell

8. ___________ are special use dredges that raise material from the bottom of the waterway by air pressure.

1. Airlift
2. Pipeline
3. Hopper
4. Clamshell

9. Which of the following is not a common method of disposal for dredged material?

1. Ocean placement
2. Beach nourishment
3. Wetland placement
4. Confined disposal facilities

10. Which of the following disposal methods is designed to seal contaminated dredged material from the environment?

1. Ocean placement
2. Confined disposal facilities
3. Beach nourishment
4. Capped disposal

11. Approximately how much material is dredged each year in the United States?

1. 40,000 cu yds
2. 40 million cu yds
3. 4 million cu yds
4. 400 million cu yds

12. ________________ is material that falls to the bottom of a liquid.

1. Solution
2. Sediment
3. Solvent
4. Saturation

13. ________________ is the periodic dredging that must be done to keep a channel clear and safe for navigation.

1. New work dredging
2. Construction dredging
3. Tunnel dredging
4. Maintenance dredging

14._________________ is the sediment dredged from a waterway.

1. Sludge
2. Dredged material
3. Raw material
4. Water

15. A _______________ is the buildup of sediment deposits on the river or ocean bottom.

1. Shoal
2. Confined disposal facility
3. Beach
4. Mountain

16. Soil definition based on the particle size of the material being greater than 0.05 mm. Sand and gravel are examples.

1. Silt
2. Coarse-grained sediment
3. Clay
4. Fine-grained sediment

17. A measurement of volume defined by a cube with each side having a length of one yard.

1. Cubic yard
2. Cubic foot
3. Cubic meter
4. Cubic inch

18. Type of dredge with rotating blades on the suction end of the pipe. The blades break up material on the bottom of the channel before it is suctioned through the pipe.

1. Cutterhead
2. Hopper
3. Pipeline
4. Barge

19. The area on land or in water within which disposal of dredged material occurs.

1. Stadium site
2. Parking lot
3. Disposal site
4. Dredged site

20. The washing away of land and soil by the action of wind and water.

1. Erosion
2. Rolling
3. Dredging
4. Washing

21. A hydraulic dredge that stores dredged material in large bins, or hoppers, inside the hull of the dredge and then transports it to the disposal area.

1. Hopper dredge
2. Mechanical dredge
3. Clamshell dredge
4. Airlift dredge

22. A person who is employed to steer a boat or ship through a particular river or channel.

1. Gunner
2. Ecologist
3. Engineer
4. Pilot

23. Soil that is carried into oceans, lakes, streams, and rivers and settles to the bottom.

1. Soil
2. Solution
3. Solvent
4. Sediment